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| | Globular Star Clusters |
 | | Charles Messier was the first to resolve one globular cluster, M4, but still referred to the other 28 of these objects in his catalog as "round nebulae." Thus, in summer 1782, before William Herschel started his comprehensive deep sky survey with large telescopes, there were 33 globular clusters known. | | | Atlas of galactic globular clusters with colour magnitude diagrams. | | | A small number of the known extragalacric globulars is in the reach of larger amateur telescopes; see Jim Shield's Extragalactic Globulars webpage for examples. |
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http://www.seds.org/messier/glob.html
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| | APOD: July 26, 1995 - M15: A Great Globular Cluster |
| | One of the brightest globular clusters in our Milky Way galaxy is the pictured M15, the fifteenth object on Messier's list of diffuse objects on our sky. | | | For more information on M15 see The Electronic Universe Project's write-up. | | | Many images of Messier objects can be found in The Electronic Universe Project's The Galaxy Gallery: Messier Objects. |
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http://www.bonus.com/contour/Astronomy_Picture_Day/http@@/antwrp.gsfc.nasa.gov/apod/ap950726.html
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| | APOD Search Results for "globular cluster" |
| | Black holes are thought to be the densest state of matter, and there is indirect evidence for their presence in stellar binary systems and the centres of globular clusters, galaxies, and quasars. | | | about 150 globular clusters known to be members of the Milky Way, NGC 6712 is thought to have | | | Recent computer modeling now indicates how some of the Canyon Diablo impactor melted during the impact that created Barringer. |
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http://www.star.ucl.ac.uk/cgi-bin/apod_search?globular+cluster
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| | NASA Hubble Space Telescope Daily Report # 3749 SpaceRef - Your Space Reference |
| | We propose to obtain deep images in the SDSS i and z filters {i=26, z=25} with the ACS/WFC on HST for a 800"x1000" field in the Chamaeleon I star-forming region {2 Myr, 160 pc}. | | | Since crowding is not a problem in the FUV, this will yield time-resolved FUV photometry of all blue objects in the cluster core. | | | We propose to carry out a deep, far-ultraviolet {FUV}, time-resolved for faint cataclysmic variables {CVs} and other dynamically-formed objects in the globular cluster {GC} M15. |
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http://www.spaceref.com/news/viewsr.html?pid=14706
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| | Chandra :: Photo Album :: M15 :: M15 Handout |
| | This is the first time that more than one neutron star binary system has been observed in a globular cluster. | | | Caption: The Chandra X-ray Observatory image of a previously identified neutron star binary system in the globular cluster M15, revealed not one binary system, but two appearing in close proximity. | | | In the neutron star binary system on the left source (left) the neutron star is hidden by an accretion disk of hot matter swirling onto it from its companion star. |
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http://chandra.harvard.edu/photo/2001/m15/m15_hand.html
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| | Messier Object 15 |
| | These have the designations PSR 2127+11, as well as PSR 2127+11 A to 2127+11 H. The most interesting of these objects is PSR 2127+11 C, which is apparently a component of a neutron star binary, i.e. | | | X-ray Binaries in M15, Chandra X-ray Observatory (September 6, 2001) | | | The globular cluster is approaching us at 107 km/sec. |
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http://www.seds.org/messier/m/m015.html
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| | Researchers Seek 'Heart' Of Black Hole Mystery |
| | An international group of researchers, using the world's fastest computer, the GRAPE-6 system in Japan, were engaged in a series of simulations of star clusters that resembled M15. | | | New detailed computer simulations, published in the Astrophysical Journal, show a different way to interpret the same data. | | | Set home page · Bookmark site · Add search |
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http://www.sciencedaily.com/releases/2003/01/030110192346.htm
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| | Chandra :: Photo Album :: M15 :: 06 Sep 01 |
| | Chandra's image of a puzzling X-ray source in the globular star cluster M15 shows that it is not one neutron star binary system, but two neutron star binary systems that appear so close together (2.7 seconds of arc) that they were indistinguishable with previous X-ray telescopes. | | | Two X-ray Binary Systems in the Globular Cluster M15 | | | In the 1970's astronomers discovered one neutron star binary system in M15, called 4U2127, with the Uhuru X-ray satellite. |
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http://chandra.harvard.edu/photo/2001/m15
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| | The Globular Cluster Page |
| | In this web you will find all the information about globular clusters (GC). | | | At the moment this web has 283 archives, 96 html files and 187 images that occupy 7219404 bytes. | | | This website was created in March,1999 using ADOBE PAGEMILL3.0. |
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http://victorian.fortunecity.com/durer/481
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| | Caltech Computational Astronomy Home Page |
| | Caltech Computational AstronomyA Hubble Space Telescope WFPC2 photograph of the core of the globular cluster M15 (courtesy ofSTScI). | | | Deep radio searches have revealed eight millisecond-period pulsars in this cluster.The 512-node Intel Paragon XPSThe Caltech Computational Astron |
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http://www.elxa.com/Detailed/732615.html
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| | M15 Great Pegasus Globular Cluster |
| | A 14th magnitude planetary nebula, Pease 1, is a resident of the cluster. | | | : M15, the Great Pegasus Cluster, is a globular cluster, deriving its name from the constellation in which it is located, at a distance of 30,600 light-years. | | | Globular clusters consist of mainly old stars as they were amoung the first stars to form in the Galaxy. |
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http://www.ironmountainobservatory.com/photos/singles/M15GreatPegasus.html
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| | M-15, globular cluster |
| | Globular Star Cluster M-15, in the constellation of Pegasus, is one of the dozen or so best examples of this type of object. | | | Their stars must be some of the first to have formed. | | | While this is older than the current Big Bang theory says is the age of the universe, we at least know that the globular clusters are many billions of years old. |
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http://www.kopernik.org/images/archive/m15.htm
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| | M15 - Globular Cluster in Pegasus |
| | More information about this object and additional images can be found at the Messier Index - M15. | | | The white component of this image is shown below. | | | The Hubble press release indicated that the dense core may be the result of the presence of a massive black hole at the center of the cluster or the density may be the result of a core collapse. |
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http://www.astroimages.org/ccd/m15.html
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| | RR Lyrae Variables in the Globular Cluster M15 |
| | The new CCD data are used to construct a color-magnitude diagram of M15, including the RR Lyrae stars. | | | New 1991-1993 CCD data for M15 have been obtained and are used to construct new B, V and R lightcurves for the variables. | | | We find an overabundance of positive period changes for this globular cluster. |
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http://www.aas.org/publications/baas/v25n4/aas183/abs/S12301.html
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| | Hubble Star Clusters |
| | But deep within their dense cores is an unexpected guest: a class of intermediate-sized black holes. | | | One of the more intriguing results of this study was completely unexpected. | | | Most of the images were taken in ultraviolet and blue filters; a few images were also taken at green and infrared wavelengths. |
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http://www.utahskies.org/HST/Archives/clusters.html
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| | Discovery of two Radio Pulsars In The Globular Cluster M15 - Anderson, Gorham, Kulkarni, Prince, Wolszczan ... |
| | 52.5% : A Study Of Recycled Pulsars In Globular Clusters - Thesis By Stuart | | | Although only twenty globular cluster pulsars are known at present, the detection of three pulsars in a single cluster suggests that there might be a large total population of these objects, whichwould make them powerful probes of the dynamics and evolution of globular clusters. | | | clusters were undertaken, a subject about which we shall comment no further in this paper (Lyne et al. |
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http://citeseer.ist.psu.edu/anderson90discovery.html
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| | Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations |
| | Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link. | | | For a journal article, please see the Resource Relation field. | | | Energy Citations Database (ECD) Document #5356178 - A color gradient in the globular cluster M15 |
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http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=5356178
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| | Pease 1: Planetary Nebula in M15 |
| | Pease 1 = PK 65-27.1, Deep Sky Challenge No. 1 for Nov - Dec, 1999, from "Off the Beaten Path" by Steve Gottlieb | | | Leos Ondra has provided more information on this planetary nebula. | | | Click on the image to see a full-size version. |
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http://www.la.yurisnight.net/messier/more/m015_pease1.html
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| | M-15 Globular Cluster |
| | MX-5C CCD Camera, STAR 2000 and IDAS LPR | | | The cluster is about 4 degrees from the star. | | | The bright star down and to the left of M-15 in the star chart is Epsilon Peg at magnitude 0.7, so you have a good starting point for finding M-15. |
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http://rao.150m.com/M15.html
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| | globular cluster |
| | As a result, astronomers have been forced to rethink their ideas about how the Milky Way evolved and, because globulars are used as a cosmic yardstick, to recheck the distances between galaxies, which might be in error by as much as 7%. | | | Hints of planet-sized objects in globular cluster (Jun 28, 2001) | | | Together with the so-called Sagittarius Stream, which emerges from the Sagittarius Dwarf Elliptical Galaxy, there are now two different examples of extended stream-like structures in the galactic halo. |
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http://www.daviddarling.info/encyclopedia/G/globclust.html
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| | M15 |
| | M15 (NGC 7078) is an excellent example in the constellation Pegasus. | | | This image shows the capabilities of the WIYN telescope rather better than most observations that night, since it has a "seeing" measurement (average FWHM of several stars) of about 0.8 arc seconds. | | | They have a spherical shape and are themselves distributed in a spherical halo around our Galaxy, the Milky Way. |
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http://www.noao.edu/image_gallery/html/im0013.html
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| | Globular cluster M15 |
| | The field is 7.1 arcminutes square, showing the inner quarter of the original area images (pixels were averaged 2x2 for this display). | | | M15 is the most popular candidate for seeing a process known as core collapse. | | | Even with this short exposure, the bright core of the cluster saturated the CCD strongly enough for some of the charge to bleed along columns of the chip; the brightness has been set to conveniently hide the problem. |
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http://www.astr.ua.edu/gifimages/m15r.html
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| | HubbleSite - M15 Globular Cluster Core - Image - 1/16/1991 |
| | Images labeled as "Print" are designed to print on standard, letter-size paper. | | | This image has been processed to remove the effects of spherical aberration. | | | Astronomical images may vary in size and resolution for several reasons: different cameras have detectors of different pixel size, images may be cropped from larger fields, and the images may consist of mosaics of several images. |
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http://hubblesite.org/newscenter/newsdesk/archive/releases/1990/23/image/a
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| | * M15 - (Astronomy): Definition |
| | The reason: That's not one star system, but two. | | | It is also the only known globular cluster to contain a planetary nebula. | | | You'll need to be pretty experienced at observing variables to spot the difference that Scheat displays varying in brightness by just half a magnitude ! |
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http://en.mimi.hu/astronomy/m15.html
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| | Globular Cluster M15 - Wikipedia, the free encyclopedia |
| | Globular Cluster M15 (also known as Messier Object 15, Messier 15, M15, or NGC 7078) is a globular cluster in the Pegasus constellation. | | | Globular Cluster Photometry With the Hubble Space Telescope. | | | This page was last modified 00:18, 11 July 2005. |
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http://en.wikipedia.org/wiki/Globular_Cluster_M15
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| | News in Science - Black hole mystery uncovered - 24/09/2002 |
| | The finding will help connect globular clusters to galaxies, providing information about one of the most important unsolved problems in astronomy today – how galaxy structure forms in the Universe. | | | M15 and other clusters orbit the Milky Way and other galaxies. | | | The researchers calculated the M15 black hole's mass to be 4,000 times that of our Sun. |
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http://www.abc.net.au/science/news/stories/s683538.htm
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| | M15 |
| | Messier object M15 is a globular cluster which is located in the constellation Pegasus. | | | M15 is unnamed and has an NGC catalog number of NGC 7078. | | | This Globular Cluster has an apparent angular size of 12.3 and a visual brightness of 6.2. |
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http://www.absoluteastronomy.com/messier_objects/m15.htm
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| | M15 Observation |
| | M15 is an unusual globular for several reasons. | | | The bright globular cluster Messier 15 (NGC 7078)is the best deep-sky object in Pegasus. | | | Larger telescopes do even better: a 12-inch at 175x resolves stars across M15's disk to create a three dimensional effect. |
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http://victorian.fortunecity.com/durer/481/observacion/m15o.html
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| | The Stellar Mass Function of the Globular Cluster M15 |
| | If these objects are neutron stars, the large inferred number suggest that either the upper main sequence mass function was flatter than the Salpeter mass function or that the progenitor stellar mass range for neutron star formation may extend to lower masses in low-metallicity systems than in high metallicity systems. | | | At no projected radius in the cluster does the local mass function reproduce the input global mass function. | | | We have fit dynamically evolving Fokker-Planck models to the globular star cluster M15. |
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http://www.aas.org/publications/baas/v29n5/aas191/abs/S080005.html
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| | M15 Globular Cluster in Pegasus |
| | M15 is one of the densest of all (globular) star clusters in our Milky Way galaxy. | | | Of the 150 known globular clusters within the Milky Way, 21 have been found to contain a collapsed core. | | | M15's core has undergone a process of contraction called "core collapse", which is thought to be common in the dynamical evolution of globulars. |
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http://www.waid-observatory.com/m015-2004-06-14.html
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| | Core of Globular Cluster M15 (SEDS HST Archive 58 of 135) |
| | Cluster stars also provide a limit on the age of the universe, independent of the expansion of the universe itself. | | | Bahcall and astrophysicist Jeremiah Ostriker of Princeton University first proposed in 1975 that M15 might harbor a black hole. | | | For a gravothermal catastrophe to occur, globular clusters must transfer energy from the inner parts of the cluster to outer regions. |
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http://www.moonguy.com/hst/95-06.html
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| | SPACE.com -- Hubble Spies Rare Planetary Nebula In Globular Cluster |
| | Livio and his colleagues Howard Bond and Keith Noll at the Space Telescope Science Institute obtained the latest data on Kuestner 648 with the help of Hubbles Wide Field Planetary Camera 2. | | | This nebula is one of only four nebulae known to reside inside a globular cluster. | | | But according to astronomers who study planetary nebulae (which, incidentally, have nothing to do with planets), stars in globular clusters like M 15 are thought to be too lightweight to make the gases around them shine as planetary nebulae. |
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http://www.space.com/scienceastronomy/astronomy/hubble_cluster_m15_000802.html
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| | X-ray Observations of X2127+119 in the Metal-poor Globular Cluster M15: An X-ray Measure of Metallicity? |
| | The continuum can be well described with the two component model of a blackbody (kT \sim 1 keV) and a power-law that was found to fit the EXOSAT ME data. | | | Interpretation of changes in spectral parameters and their relation to orbital phase and longer timescale variations will be discussed. | | | A model separating the absorption of H and He and the metals gives 3.4^+0.09_-0.52\times10^21 cm^-2 for the column density of metals in the absorbing gas associated with the binary system. |
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http://www.aas.org/publications/baas/v27n4/aas187/S082010.html
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| | [No title] |
| | Data reduction and analysis will be performed at the Institue for Advanced Study. | | | John N. Bahcall INSTITUTE FOR ADVANCED STUDY USA (609) 734-8054 DR. | | | These exposures will be an important test of the ability of the HST to do crowded field photometry. |
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http://ecf.hq.eso.org/poa/FOS/props/3040c.pro
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| | HST Observations of Globular Clusters |
| | Over the past few years we have used the Hubble Space Telescope's Planetary Camera (first the first and second versions) to obtain multicolor images of the centers of Galactic globular clusters. | | | The surface distribution is consistent with the expected profile if the cluster harbors a relatively massive (10^3 M_sun) black hole, but dynamical information is required before the black hole model can be verified. | | | The data show that the surface density of stars continues to rise as a power law down to the limit of the observations (a radius of 0.3" or 0.017 pc); a flat core with a radius larger than 2" is ruled out at the 95% confidence level. |
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http://www.astro.psu.edu/users/dps/HST_observations.html
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| | JBO - Pegasus Constellation |
| | M15 is one of the six globular clusters brighter than 7th magnitude in the northern sky. | | | M15 is easily found by following the line of the two stars Theta and Epsilon Pegasi a further 4 degrees in a north-westerly direction. So, by placing Epsilon at the appropriate side of a binocular or finder scope field, M15 should be visible towards the other. | | | With medium power, the cluster is seen to lie within a triangle of three stars, one seventh and two 8th magnitude. M15 lies at a distance of 37,000 light years. |
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http://www.jb.man.ac.uk/public/AList/Pegasus.html
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| | Messier Object 15 |
| | M15 peut être trouvée extrêmement facilement : chercher l'étoile de seconde magnitude Epsilon Pegasi, puis Thêta Pegasi au Sud-Est. | | | Avec sa brillance visuelle apparente de magnitude 6,2, M15 est à la limite de visibilité à l'oeil nu, dans d'excellentes conditions. | | | Suivre l'alignement de Thêta vers Epsilon et découvrir M15 à 3,5 degrés à l'Ouest et 2,25 degrés au Nord de Epsilon. |
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http://www.obspm.fr/messier/f/m015.html
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| | Pease 1 Finder Charts |
| | It is entitled `A Golden Planetary' and provides historical and current information on the research of this obscure, but important and interesting planetary nebula. | | | This will hopefully help others to find Pease 1 more easily. | | | Click HERE to view a recent Hubble Space Telescope color image of Pease1 and a good part of M15 (Pease1 is the pinkish object at the upper left). |
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http://www.blackskies.com/peasefc.htm
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| | hubble space telescope hst true color image of the central region of M15 |
| | The triple star AC 214 is the white object 0.5 arcseconds east of the center; its three components appear blended together in this picture. | | | The surface density of stars is clearly seen to increase towards the cluster center all the way in to radii less than 0.5 arcseconds. | | | Bright red giant branch stars with B-V ~ 1.3 appear reddish orange while blue horizontal branch stars with B-V ~ 0 appear blue. |
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http://www.sns.ias.edu/~jnb/HST/Globclusters/m15colors.html
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| | Science Central - Globular cluster M15 |
| | Catalogue of Milky Way Globular Cluster Parameters (Populatiry: | | | ): Introductory information on globular clusters, a diagram of their distribution... | | | ): Searchable database of galactic globular clusters parameters. |
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http://sciencecentral.com/site/510543
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| | Globular Cluster M15 |
| | This globular is also a source of X-ray energy and may contain a black hole. | | | Three 1 minute exposures dark compensated, aligned and stacked, background removed and Digitaly Developed in ImagesPlus 2.10 beta 5. | | | One of the richer and more compact globular clusters. |
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http://tas.digitalastro.net/Thru%20The%20Eyepiece/M15.html
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| | Dynamical Models of the Globular Cluster M15 |
| | Our best fitting model indicates that the core of M15 is not currently near maximum bounce. | | | We use evolving multi-mass Fokker-Planck models to investigate the stellar populations of the post-core-collapse globular cluster M15. | | | This model contains approximately $10^4$ neutron stars (3\% of the total mass), of which the majority lie within 6 arcseconds (0.2 parsec) of the cluster center. |
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http://www.aas.org/publications/baas/v26n4/aas185/abs/S10310.html
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| | GGCs database: globular cluster NGC 7078 |
| | Web Links for this cluster (1 link in the database at the moment) | | | Users comments for this cluster (0 comments in the database at the moment) | | | This page has been visited 342 times, since Oct 25 2004 |
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http://www.mporzio.astro.it/~marco/gc/cluster_4.php?ggc=M+15
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| | 2001 VIEWING CALENDAR |
| | Globular Cluster M15 in Pegasus, Scorpius and Sagittarius nebula and star clusters, Alpha Centauri Binary star, 47 Tucana cluster | | | Globular cluster 47 Tucana, The Large Magellanic Cloud and the Tarantula Nebula, other galaxies. | | | A tour highlight of late 2005 will be the planet Mars. |
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http://www.bathurstobservatory.com.au/2001_viewing_calendar.htm
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| | Best of AOP: M15 |
| | M15 is one of three globular clusters known to harbour a planetary nebula. | | | Would you like to take images like this? | | | A triangle of three stars that are represented in both images are labeled for easier comparison. |
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http://www.noao.edu/outreach/aop/observers/m15.html
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| | [No title] |
| | The increase of the dispersion toward the center is not consistent with truncated isothermal (King-Michie) models, for which the velocity dispersion is nearly constant within a few core radii and then falls steeply beyond. | | | =1989ApJ...347..251P ================================================================================ Abstract: The velocity dispersion as a function of radius in the globular cluster M15 is derived from measurements of 120 individual stars between 0.1' and 4.6' of the cluster center, and from the integrated light of the central cusp. | | | Except for its greater velocity broadening, the spectrum of the integrated light of the cusp is indistinguishable from that formed by superposition of the individual M15 giant spectra, demonstrating that the excess light at the center is due primarily to the normal M15 population. |
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http://www.journals.uchicago.edu/AAS/cdrom/volume4/volume4/apj/v347/p251/table.doc
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