Results 21 to 30 of about 129,479 (207)

Novae in Clusters and Galaxies [PDF]

International Astronomical Union Colloquium, 1990
My main goal in giving this review is NOT to induce hibernation in the audience. Rather, it is to survey the known cases of erupting classical novae in open and globular clusters, and galaxies external to the Milkey Way. More important, I want to emphasize what these novae in stellar systems can teach us about nova eruptions.
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Detection of a Star Forming Galaxy in the Center of a Low-Mass Galaxy Cluster

, 2018
Brightest Cluster Galaxies (BCGs) residing in the centers of galaxy clusters are typically quenched giant ellipticals. A recent study hinted that star-forming galaxies with large disks, so-called superluminous spirals and lenticulars, are the BCGs of a ...
Andrade-Santos, Felipe, Bogdan, Akos, Forman, William R., Jones, Christine, Kovacs, Orsolya E., Kraft, Ralph P., Lovisari, Lorenzo   +6 more
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THE ASSEMBLY OF GALAXY CLUSTERS [PDF]

The Astrophysical Journal, 2008
We study the formation of fifty-three galaxy cluster-size dark matter halos formed within a pair of cosmological LCDM N-body simulations, and track the accretion histories of cluster subhalos with masses large enough to host 0.1L* galaxies. By associating subhalos with cluster galaxies, we find the majority of galaxies in clusters experience no pre ...
Berrier, Joel C., Stewart, Kyle R., Bullock, James S., Purcell, Chris W., Barton, Elizabeth J., Wechsler, Risa H.   +5 more
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Chandra Studies of the X-ray Gas Properties of Fossil Systems

, 2015
We study ten galaxy groups and clusters suggested in the literature to be "fossil system (FS)" based on \chandra\ observations. According to the $M_{500}-T$ and $L_{\rm X}-T$ relations, the gas properties of FSs are not physically distinct from ordinary ...
Qin, Zhenzhen
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The Environmental Dependence of the Evolving S0 Fraction [PDF]

, 2010
We reinvestigate the dramatic rise in the S0 fraction, f_S0, within clusters since z ~ 0.5. In particular, we focus on the role of the global galaxy environment on f_S0 by compiling, either from our own observations or the literature, robust line-of ...
Andreon, Balogh, Balogh, Bekki, Christlein, Couch, Couch, David J. Sand, Dennis W. Just, Dennis Zaritsky, Desai, Dressler, Fasano, Finn, Gregory Rudnick, Hinz, Icke, Kannappan, Kautsch, Kendall, Mihos, Moore, Moran, Papovich, Poggianti, Poggianti, Poggianti, Postman, Sandage, Smail, Smith, Tran, Vandana Desai, Wechsler, Wilman, Yang, Yang, Zabludoff, Zabludoff   +38 more
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Near-IR search for lensed supernovae behind galaxy clusters: III. Implications for cluster modeling and cosmology

, 2011
Massive galaxy clusters at intermediate redshifts act as gravitational lenses that can magnify supernovae (SNe) occurring in background galaxies. We assess the possibility to use lensed SNe to put constraints on the mass models of galaxy clusters and the
A. Goobar, Amanullah, Bell, Bolton, Bradač, Bradley, Broadhurst, Casali, Coe, Conley, Dahlén, Dawson, E. Mörtsell, Fohlmeister, Goobar, Goobar, Goobar, Inada, J. Jönsson, J. Richard, Jullo, K. Paech, Kissler-Patig, Kneib, Kochanek, Kolatt, Lampeitl, Limousin, M. Limousin, Moorwood, Mörtsell, Oguri, Oguri, Pirard, R. Amanullah, Refsdal, Richard, Riess, Scannapieco, Stanishev, Suyu, T. Dahlén, T. Riehm, Wambsganss, Witt, Zhao, Zheng   +46 more
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A GMBCG Galaxy Cluster Catalog of 55,424 Rich Clusters from SDSS DR7

, 2010
We present a large catalog of optically selected galaxy clusters from the application of a new Gaussian Mixture Brightest Cluster Galaxy (GMBCG) algorithm to SDSS Data Release 7 data.
Abazajian, Abell, Adami, Annis, August Evrard, Barger, Barrientos, Bartelmann, Benjamin P. Koester, Berlind, Bernstein, Blakeslee, Blakeslee, Blanton, Bower, Burenin, Böhringer, Couch, David E. Johnston, David Gerdes, Dong, Eduardo Rozo, Efstathiou, Eisenhardt, Eisenstein, Eli S. Rykoff, Erin Sheldon, Gal, Gal, Gal, Gerdes, Gladders, Gladders, Gladders, Gladders, Gladders, Goto, Hansen, Hao, Hao, Hao, Hao, James Annis, Jiangang Hao, Johnston, Kepner, Kim, Koester, Koester, Li, Lopes, López-Cruz, Majumdar, Matthew Becker, Mei, Michael Busha, Miller, Mullis, Navarro, Oukbir, Oyaizu, Papovich, Perlmutter, Postman, Ramella, Riess, Risa H. Wechsler, Rozo, Rozo, Rozo, Rozo, Rykoff, Seth R. Siegel, Sheldon, Silverman, Spergel, Spergel, The Dark Energy Survey Collaboration., Timothy A. McKay, Wen, Yang, York   +81 more
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Finding Galaxy Clusters using Voronoi Tessellations [PDF]

, 2001
We present an objective and automated procedure for detecting clusters of galaxies in imaging galaxy surveys. Our Voronoi Galaxy Cluster Finder (VGCF) uses galaxy positions and magnitudes to find clusters and determine their main features: size, richness
Basilakos, Boulade, D. Fadda, Doroshkevich, Ebeling, El-Ad, El-Ad, Fadda, Goldwirth, Holden, Icke, Ikeuchi, Kawasaki, Kepner, Kiang, Lidman, Lubin, M. Nonino, M. Ramella, Olsen, Pence, Phillips, Pisani, Plionis, Poggianti, Postman, Ramella, Ryden, Scodeggio, Struble, W. Boschin, Wang, Zaninetti   +32 more
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An Age Difference of 2 Gyr between a Metal-Rich and a Metal-Poor Globular Cluster

, 2013
Globular clusters trace the formation history of the spheroidal components of both our Galaxy and others, which represent the bulk of star formation over the history of the universe.
Anderson, J., Dotter, A., Fahlman, G. G., Hansen, B. M. S., Hurley, J. R., Kalirai, J. S., King, I. R., Reitzel, D., Rich, R. M., Richer, H. B., Shara, M. M., Stetson, P. B.   +11 more
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Cosmology with Clusters of Galaxies [PDF]

, 2008
In this Chapter I review the role that galaxy clusters play as tools to constrain cosmological parameters. I will concentrate mostly on the application of the mass function of galaxy clusters, while other methods, such as that based on the baryon fraction, are covered by other Chapters of the book.
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