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Using $\sim 100$ X-ray selected clusters in the Dark Energy Survey Science Verification data, we constrain the luminosity function (LF) of cluster red sequence galaxies as a function of redshift. This is the first homogeneous optical/X-ray…

We examine the systematics affecting the X-ray mass estimators applied to a set of five simulated galaxy clusters. They have been processed through the X-ray Map Simulator, X-MAS, to provide Chandra-like long exposures that are analyzed to…

Astrophysics · Physics 2009-11-11 E. Rasia , S. Ettori , L. Moscardini , P. Mazzotta , S. Borgani , K. Dolag , G. Tormen , L. M. Cheng , A. Diaferio

X-ray surveys allow to identify young, main-sequence stars in the solar neighborhood. Young, stellar samples, selected according to their activity, can be used to determine the stellar birthrate in the last billion years. The ROSAT North…

Astrophysics · Physics 2009-11-13 L. Affer , G. Micela , T. Morel

The current paradigm of cosmic formation and evolution of galaxy clusters foresees growth mostly through merging. Galaxies in the infall region or in the core of a cluster undergo transformations owing to different environmental stresses.…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 F. G. Braglia , D. Pierini , A. Biviano , H. Boehringer

Binary stars play a major role in determining the dynamic evolution of star clusters. We used images collected with the Hubble Space Telescope to study fourteen Magellanic Clouds star clusters that span an age interval between $\sim 0.6$…

Context. Recent Chandra observations of the Galactic center region (GCR) have uncovered a population of faint discrete X-ray sources. A few theoretical works have been made to investigate the nature of these sources. Aims. We examine the…

Astrophysics · Physics 2009-11-11 X. W. Liu , X. D. Li

Star clusters are found in all sorts of environments and their formation and evolution is inextricably linked to the star formation process. Their eventual destruction can result from a number of factors at different times, but the process…

Astrophysics of Galaxies · Physics 2011-10-05 I. S. Konstantopoulos , N. Bastian , M. Gieles , H. J. G. L. M. Lamers

The current generation of X-ray observatories like Chandra allows studies with very fine spatial details. It is now possible to resolve X-ray point sources projected into the cluster diffuse emission and exclude them from the analysis to…

Astrophysics · Physics 2009-11-13 M. Branchesi , I. M. Gioia , C. Fanti , R. Fanti

We investigate the globular cluster (GC) system scaling parameters as a function of galaxy mass, i.e. specific frequency (S_N), specific luminosity (S_L), specific mass (S_M), and specific number (^T) of GCs. We sample the entire range in…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 Iskren Y. Georgiev , Thomas H. Puzia , Paul Goudfrooij , Michael Hilker

We discuss the measurements of the galaxy cluster mass functions at z=~0.05 and z=~0.5 using high-quality Chandra observations of samples derived from the ROSAT PSPC All-Sky and 400deg^2 surveys. We provide a full reference for the data…

The relationships between the X-ray determined bolometric luminosity Lx, the temperature T of the intracluster gas, and the optical measured velocity dispersion sigma of the cluster galaxies are updated for galaxy clusters using the largest…

Astrophysics · Physics 2009-10-31 Xiang-Ping Wu , Yan-Jie Xue , Li-Zhi Fang

We study the uncertainty in galaxy cluster mass estimates derived from X-ray data assuming hydrostatic equilibrium (HE) for the intra cluster gas. Using a Monte-Carlo procedure we generate a general class of mass models allowing very…

Astrophysics · Physics 2007-05-23 C. Balland , A. Blanchard

We have modeled the displacement of luminous X-ray binaries from star clusters in star-burst galaxies with an evolutionary population synthesis code developed by Hurley et al. (2000, 2002). In agreement with Kaaret et al. (2004), we find…

High Energy Astrophysical Phenomena · Physics 2015-05-18 Zhao-Yu Zuo , Xiang-Dong Li

We use archival {\it Hubble Space Telescope} observations of broad-band images from the ultraviolet (F255W-filter) through the near infrared (NICMOS F160W-filter) to study the star cluster population of the interacting spiral galaxy M51. We…

Astrophysics · Physics 2009-11-10 N. Bastian , M. Gieles , H. J. G. L. M. Lamers , R. de Grijs , R. A. Scheepmaker

Star clusters are ideal platforms for categorising X-ray emitting stars and to study X-ray emission as a function of stellar age and activity. We present a comprehensive study of an open star cluster, NGC2527, by combining data from…

Solar and Stellar Astrophysics · Physics 2020-03-11 Nevil Shah , K. P. Singh , Annapurni Subramaniam

Star clusters are well known for their dynamical interactions, an outcome of their high stellar densities; in this paper we use multiwavelength observations to search for the unique outcomes of these interactions in three nearby Galactic…

Recent ROSAT surveys suggest that galaxies constitute the new class of X-ray sources required to explain the full phenomenology of the cosmic X-Ray Background (XRB). To test this hypothesis, we compute the two-point cross-correlation…

Astrophysics · Physics 2016-08-30 A. Refregier , D. J. Helfand , R. G. McMahon

This chapter discusses the implications of X-ray binaries on our knowledge of Type Ibc and Type II supernovae. X-ray binaries contain accreting neutron stars and stellar--mass black holes which are the end points of massive star evolution.…

High Energy Astrophysical Phenomena · Physics 2018-04-25 Jorge Casares , Peter G. Jonker , Garik Israelian

We present the first results of a survey to obtain Integral Field Spectroscopy of merging galaxies along the Toomre Sequence. In the present work, we concentrate on the star cluster complexes in the Antennae galaxies (NGC 4038/39) in the…

Astrophysics · Physics 2009-11-11 N. Bastian , E. Emsellem , M. Kissler-Patig , C. Maraston

This is the third of a series of papers in which we derive simultaneous constraints on cosmological parameters and X-ray scaling relations using observations of the growth of massive, X-ray flux-selected galaxy clusters. Our data set…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 David Rapetti , Steven W. Allen , Adam Mantz , Harald Ebeling