The global mass functions of 35 Galactic globular clusters: I. Observational data and correlations with cluster parameters

Abstract

We have derived the global mass functions of a sample of 35 Galactic globular clusters by comparing deep Hubble Space Telescope photometry with suitable multimass dynamical models. For a subset of 29 clusters with available radial velocity information we were also able to determine dynamical parameters, mass-to-light ratios and the mass fraction of dark remnants. The derived global mass functions are well described by single power-laws in the mass range $0.2<m/M_{\odot }<0.8$ with mass function slopes $\alpha >-1$. Less evolved clusters show deviations from a single-power law, indicating that the original shape of their mass distribution was not a power-law. We find a tight anticorrelation between the present-day mass function slopes and the half-mass relaxation times, which can be understood if clusters started from the same universal IMF and internal dynamical evolution is the main driver in shaping the present-day mass functions. Alternatively, IMF differences correlated with the present-day half-mass relaxation time are needed to explain the observed correlation. The large range of mass function slopes seen for our clusters implies that most globular clusters are dynamically highly evolved, a fact that seems difficult to reconcile with standard estimates for the dynamical evolution of clusters. The mass function slopes also correlate with the dark remnant fractions indicating a preferential retention of massive remnants in clusters subject to high mass-loss rates.

arXiv comment14 pages, 12 figures, MNRAS in press

References in corpus (45)

• Galactic Stellar and Substellar Initial Mass Function
• On the variation of the Initial Mass Function
• A Universal Stellar Initial Mass Function? A Critical Look at Variations
• Dynamical evolution of star clusters in tidal fields
• Resolved Massive Star Clusters in the Milky Way and its Satellites: Brightness Profiles and a Catalogue of Fundamental Parameters
• The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry
• The ACS Survey of Galactic Globular Clusters. IX. Horizontal Branch Morphology and the Second Parameter Phenomenon
• Early Star Formation and the Evolution of the Stellar Initial Mass Function in Galaxies
• The accretion origin of the Milky Way's stellar halo
• An ACS Survey of Globular Clusters V: Star Catalog for Each Cluster
• On the Initial Mass Function of Population III Stars
• A Theory of the IMF for Star Formation in Molecular Clouds
• The ACS Survey of Galactic Globular Clusters. II. Stellar Evolution Tracks, Isochrones, Luminosity Functions, and Synthetic Horizontal-Branch Models
• The Milky Way stellar halo out to 40 kpc : Squashed, broken but smooth
• On the effects of dynamical evolution on the initial mass function of globular clusters
• N-body modeling of globular clusters: Masses, mass-to-light ratios and intermediate-mass black holes
• The Stellar Initial Mass Function of Ultra-Faint Dwarf Galaxies: Evidence for IMF Variations with Galactic Environment
• The Initial Mass Function of the Galactic Bulge Down to ~0.15 Msun
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. II. Kinematic profiles and maps
• Star count density profiles and structural parameters of 26 Galactic globular clusters
• Uncloaking globular clusters in the inner Galaxy
• The Masses of Population II White Dwarfs
• Statistics of N-Body Simulations. III. Unequal Masses
• Light-element Abundance Variations in the Milky Way Halo
• Why haven't loose globular clusters collapsed yet?
• Back to the Future: Estimating Initial Globular Cluster Masses from their Present Day Stellar Mass Functions
• The orbits of 48 globular clusters in a Milky-Way-Like Barred Galaxy
• Hubble Space Telescope Observations of the Draco Dwarf Spheroidal
• On the temporal evolution of the stellar mass function in Galactic clusters
• The evolution of the stellar mass function in star clusters
• Faint Stars in the Ursa Minor Dwarf Spheroidal Galaxy: Implications for the Low-Mass Stellar Initial Mass Function at High Redshift
• The Stellar Mass Spectrum in Warm and Dusty Gas: Deviations from Salpeter in the Galactic Centre and in Circum-Nuclear Starburst Regions
• A comparison between the stellar and dynamical masses of six globular clusters
• New insights on the Galactic Bulge Initial Mass Function
• Six New Galactic Orbits of Globular Clusters in a Milky-Way-Like Galaxy
• The Panchromatic Hubble Andromeda Treasury IV. A Probabilistic Approach to Inferring the High Mass Stellar Initial Mass Function and Other Power-law Functions
• The statistical challenge of constraining the low-mass IMF in Local Group dwarf galaxies
• The evolution of the global stellar mass function of star clusters: an analytic description
• Quantifying the Universality of the Stellar Initial Mass Function in Old Star Clusters
• Neutron star natal kicks and the long-term survival of star clusters
• Radial Variation in the Stellar Mass Functions of Star Clusters
• HST observations of the metal rich globular clusters NGC6496 and NGC6352
• HST Photometry of 47 Tuc and Analysis of the Stellar Luminosity Function in Milky-Way Clusters
• CCD Photometry of the Globular Cluster NGC 4833 and Extinction Near the Galactic Plane
• Testing multi-mass dynamical models of star clusters with real data: mass segregation in three Galactic globular clusters

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