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The mass function of galaxy clusters is a powerful tool to constrain cosmological parameters, e.g., the mass fluctuation on the scale of 8 h^{-1} Mpc, sigma_8, and the abundance of total matter, Omega_m. We first determine the scaling…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 Z. L. Wen , J. L. Han , F. S. Liu

We present an analysis of the radial dependence of the stellar mass function in the diffuse outer-halo globular cluster Palomar 14. Using archival HST/WFPC2 data of the cluster's central 39 pc (corresponding to ~0.85*r_h) we find that the…

Astrophysics of Galaxies · Physics 2013-01-23 Matthias J. Frank , Eva K. Grebel , Andreas H. W. Küpper

The stellar initial mass functions (IMFs) for the Galactic bulge, the Milky Way, other galaxies, clusters of galaxies, and the integrated stars in the Universe are composites from countless individual IMFs in star clusters and associations…

Astrophysics · Physics 2008-11-26 Bruce G. Elmegreen

We have used HST and ground-based photometry to determine total $V$-band magnitudes and mass-to-light ratios of more than 150 Galactic globular clusters. We do this by summing up the magnitudes of their individual member stars, using…

Astrophysics of Galaxies · Physics 2020-11-11 H. Baumgardt , A. Sollima , M. Hilker

In this paper, we use the general theory worked out within the past few years for the structure and the evolution of low-mass stars to derive the stellar mass-function in the Galactic disk down to the vicinity of the hydrogen-burning limit,…

Astrophysics · Physics 2011-06-21 G. Chabrier

Globular clusters (GCs) are often used to estimate the dark matter content of galaxies, especially dwarfs, where other kinematic tracers are lacking. These estimates typically assume spherical symmetry and dynamical equilibrium, assumptions…

Astrophysics of Galaxies · Physics 2021-02-17 Jessica E. Doppel , Laura V. Sales , Julio F. Navarro , Mario G. Abadi , Eric W. Peng , Elisa Toloba

We show that one can obtain a good fit to the measured main sequence mass function (MF) of a large sample of Galactic clusters (young and old) with a tapered Salpeter power law distribution function with an exponential truncation. The…

Astrophysics · Physics 2015-11-11 Guido De Marchi , Francesco Paresce , Simon Portegies Zwart

We present NICMOS NIC3 observations of the Galactic globular cluster NGC 288, taken South - East at 2.4 times the cluster's half-light radius in the J and H bands. We have detected the cluster main sequence down to J~25 and H~24. The…

Astrophysics · Physics 2007-05-23 A. Pasquali , M. S. Brigas , G. De Marchi

The 'chromosome map' diagram (ChM) proved a successful tool to identify and characterize multiple populations (MPs) in 59 Galactic Globular Clusters (GCs). Here, we construct ChMs for 11 GCs of both Magellanic Clouds (MCs) and with…

A new X-ray selected and X-ray flux-limited galaxy cluster sample is presented. Based on the ROSAT All-Sky Survey the 63 brightest clusters with galactic latitude |bII| >= 20 deg and flux fx(0.1-2.4 keV) >= 2 * 10^{-11} ergs/s/cm^2 have…

Astrophysics · Physics 2011-02-11 Thomas H. Reiprich , Hans Boehringer

We investigated the stellar mass function and the binary fraction of 114 nearby open clusters (OCs) using the high-precision photometric data from Gaia Data Release 3 (Gaia DR3). We estimated the mass of member stars by using a ridge line…

Solar and Stellar Astrophysics · Physics 2024-05-22 Yueyue Jiang , Jing Zhong , Songmei Qin , Tong Tang , Li Chen , Jinliang Hou

We present a series of simple, largely analytical models to compute the effects of disruption on the mass function of star clusters. Our calculations include evaporation by two-body relaxation and gravitational shocks and mass loss by…

Astrophysics · Physics 2009-11-06 S. Michael Fall , Qing Zhang

We exploit a combination of high-resolution Hubble Space Telescope and wide-field ESO-VLT observations to study the slope of the global mass function (alphaG) and its radial variation (alpha(r)) in the two dense, massive and post…

We present predictions for the two-point correlation function of galaxy clustering as a function of stellar mass, computed using two new versions of the GALFORM semi-analytic galaxy formation model. These models make use of a high…

High-precision HST photometry has recently revealed that the globular cluster (GC) NGC 2808 hosts a triple main sequence (MS) corresponding to three stellar populations with different helium abundances. We carried out photometry on ACS/WFC…

Solar and Stellar Astrophysics · Physics 2015-05-30 A. P. Milone , G. Piotto , L. R. Bedin , S. Cassisi , J. Anderson , A. F. Marino , A. Pietrinferni , A. Aparicio

We present the first measurement of the mass function of galaxy clusters based directly on cluster masses derived from observations of weak gravitational lensing. To investigate the degree of sample incompleteness resulting from the X-ray…

Astrophysics · Physics 2009-02-06 H. Dahle

We have constructed the mass function of globular star clusters in the Sombrero galaxy in bins of different internal half-mass density rho_h and projected galactocentric distance R. This is based on the published measurements of the…

Astrophysics · Physics 2009-11-13 Rupali Chandar , S. Michael Fall , Dean E. McLaughlin

Context. We use Hubble Space Telescope photometry of six rich, compact star clusters in the Large Magellanic Cloud (LMC), with ages ranging from 0.01 to 1.0 Gyr, to derive the clusters' stellar mass functions (MFs) at their half-mass radii.…

Solar and Stellar Astrophysics · Physics 2015-05-13 Q. Liu , R. de Grijs , L. C. Deng , Y. Hu , S. F. Beaulieu

The near-universal turnover mass of the present-day globular cluster mass function (GCMF), $M_{\rm TO} \sim 2 \times 10^5\ {\rm M_\odot}$, is a well established observational feature across galaxies of different types and masses, providing…

Astrophysics of Galaxies · Physics 2026-05-28 Elizabeth Moreno-Hilario , Hui Li , Luis A. Martinez-Medina

Data obtained with the NICMOS instrument on board the Hubble Space Telescope (HST) have been used to determine the H-band luminosity function (LF) and mass function (MF) of three stellar fields in the globular cluster M15, located ~7' from…

Astrophysics · Physics 2009-11-10 A. Pasquali , G. De Marchi , L. Pulone , M. S. Brigas