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Related papers: Luminosity Function of Faint Globular Clusters in …

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We use near-infrared observations obtained as part of the {\sl Visible and Infrared Survey Telescope for Astronomy} (VISTA) Survey of the Magellanic Clouds (VMC), as well as two complementary {\sl Hubble Space Telescope} ({\sl HST}) data…

We present a high precision, large sample luminosity function (LF) for the Galactic globular cluster M3. With a combination of ground based and Hubble Space Telescope data we cover the entire radial extent of the cluster. The observed LF is…

Using HST and the WFPC2 we have acquired very deep V- and I-band photometry of stars in NGC 2420 and NGC 2477 to study cluster luminosity functions at approximately solar metallicity. We have determined these cluster luminosity functions…

Astrophysics · Physics 2009-10-28 Ted von Hippel , Gerard Gilmore , Nial Tanvir , David Robinson , Derek H. P. Jones

HST imaging of M22 has allowed, for the first time, a detailed and uniform mapping of mass segregation in a globular cluster. Luminosity and mass functions from the turnoff down to the mid to lower main sequence are presented for M22 in…

Astrophysics · Physics 2009-11-07 Michael D. Albrow , Guido De Marchi , Kailash C. Sahu

The majority of observed mass-to-light ratios of globular clusters are too low to be explained by `canonical' cluster models, in which dynamical effects are not accounted for. Moreover, these models do not reproduce a recently reported…

Astrophysics · Physics 2009-11-13 J. M. Diederik Kruijssen

1057 globular cluster candidates have been identified in a WFPC2 image of the inner region of M87. The Globular Cluster Luminosity Function (GCLF) can be well fit by a Gaussian profile with a mean value of m_V^0=23.67 +/- 0.07 mag and…

Astrophysics · Physics 2009-10-05 A. Kundu , B. C. Whitmore , W. B. Sparks , F. D. Macchetto , S. E. Zepf , K. M. Ashman

We present internal velocity dispersions and precise radial velocities for 200 globular clusters (GCs) in M31 that are derived using new high-resolution spectra from MMT/Hectochelle. Of these, 163 also have King model structural parameters…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 Jay Strader , Nelson Caldwell , Anil Seth

In this paper we compare the mass function slopes of Galactic globular clusters recently determined by Sollima & Baumgardt (2017) with a set of dedicated N-body simulations of star clusters containing between 65,000 to 200,000 stars. We…

Astrophysics of Galaxies · Physics 2017-10-27 Holger Baumgardt , Antonio Sollima

We report on the discovery of a surprising observed correlation between the slope of the low-mass stellar global mass function (GMF) of globular clusters (GCs) and their central concentration parameter c = log(r_t/r_c), i.e. the logarithmic…

Astrophysics · Physics 2007-10-18 Guido De Marchi , Francesco Paresce , Luigi Pulone

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

We present an analysis of a 50 orbit HST ACS observation of the M87 globular cluster system. We use the extraordinary depth of this dataset to test whether the colors and magnitudes show evidence for a mass-metallicity relation in globular…

Astrophysics · Physics 2011-02-11 Christopher Z. Waters , Stephen E. Zepf , Tod R. Lauer , Edward A. Baltz

CFHT Megacam data in (g',r',i') are used to obtain deep, wide-field photometry of the globular cluster system (GCS) around M87. A total of 6200 GCs brighter than M_I = -8.5 are included in the study, essentially containing almost the entire…

Astrophysics of Galaxies · Physics 2015-05-13 William E. Harris

We present a survey of mass profiles and mass-to-light ratios of eight typical galaxy clusters at a common redshift (z ~ 0.2). We use weak gravitational lensing as a probe because it is unique in avoiding any assumptions about the dynamical…

Luminosity functions from theoretical stellar evolution calculations are compared with observed ones of several galactic globular clusters (M30, M92, M68, NGC6397, M4, M80, NGC6352, NGC1851). Contrary to earlier results of Faulkner &…

Astrophysics · Physics 2007-05-23 S. Degl'Innocenti , A. Weiss , L. Leone

Luminosity functions have been determined for star cluster populations in 20 nearby (4-30 Mpc), star-forming galaxies based on ACS source lists generated by the Hubble Legacy Archive. Comparisons are made with other recently generated…

Astrophysics of Galaxies · Physics 2015-06-19 Bradley C. Whitmore , Rupali Chandar , Ariel S. Bowers , Soeren Larsen , Kevin Lindsay , Asna Ansari , Jessica Evans , .

We argue that gravitational microlensing is a feasible technique for measuring the mass function of brown dwarf stars in distant galaxies. Microlensing surveys of the bulge of M31, and of M87 in the Virgo cluster, may provide enough events…

Astrophysics · Physics 2009-10-31 E. A. Baltz , J. Silk

We present measurements of the masses of a sample of 25 moderate X-ray luminosity clusters of galaxies from the 160 square degree ROSAT survey. The masses were obtained from a weak lensing analysis of deep F814W images obtained using the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Henk Hoekstra , Megan Donahue , Christopher J. Conselice , Brian R. McNamara , G. Mark Voit

Studying the radial variation of the stellar mass function in globular clusters (GCs) has proved a valuable tool to explore the collisional dynamics leading to mass segregation and core collapse. In order to study the radial dependence of…

Solar and Stellar Astrophysics · Physics 2015-05-18 G. Beccari , M. Pasquato , G. De Marchi , E. Dalessandro , M. Trenti , M. Gill

The Main Sequence Luminosity Function (LF) of the Galactic globular cluster NGC 288 has been obtained using deep WFPC2 photometry. We have employed a new method to correct for completeness and fully account for bin-to-bin migration due to…

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