Another Non-segregated Blue Straggler Population in a Globular Cluster: the Case of NGC 2419

Abstract

We have used a combination of ACS-HST high-resolution and wide-field SUBARU data in order to study the Blue Straggler Star (BSS) population over the entire extension of the remote Galactic globular cluster NGC 2419. The BSS population presented here is among the largest ever observed in any stellar system, with more than 230 BSS in the brightest portion of the sequence. The radial distribution of the selected BSS is essentially the same as that of the other cluster stars. In this sense the BSS radial distribution is similar to that of omega Centauri and unlike that of all Galactic globular clusters studied to date, which have highly centrally segregated distributions and, in most cases, a pronounced upturn in the external regions. As in the case of omega Centauri, this evidence indicates that NGC 2419 is not yet relaxed even in the central regions. This observational fact is in agreement with estimated half-mass relaxation time, which is of the order of the cluster age.

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References in corpus (36)

• The Photometric Performance and Calibration of the HST Advanced Camera For Surveys
• Omega Centauri: The Population Puzzle Goes Deeper
• Internal Dynamics of Globular Clusters
• Multiple Stellar Populations in the Globular Cluster omega Centauri as Tracers of a Merger Event
• Formation of omega Centauri from an ancient nucleated dwarf galaxy in the young Galactic disc
• The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features
• A helium spread among the main sequence stars in NGC 2808
• The properties of Galactic globular cluster sub-systems
• Discovery of Extended Blue Horizontal Branches in Two Metal-Rich Globular Clusters
• New evidence for the complex struscture of the RGB of Omega Cen
• Sagittarius Tidal Debris 90 kpc from the Galactic Center
• Blue straggler production in globular clusters
• NGC 6441: another indication for a very high helium content in Globular Cluster stars
• Blue Straggler Stars: a direct comparison of Star counts and population ratios in six Galactic Globular Clusters
• Blue Straggler Stars: The Spectacular Population in M80
• Metallicities, relative ages and kinematics of stellar populations in omega Centauri
• The contribution of primordial binaries to the blue straggler population in 47 Tucanae
• Globular clusters and the formation of the outer Galactic halo
• The radial distribution of blue straggler stars and the nature of their progenitors
• The Peculiar Horizontal Branch Morphology of the Galactic Globular Clusters NGC 6388 and NGC 6441: new insights from UV observations
• The pure non-collisional Blue Straggler population in the giant stellar system omega Centauri
• NGC 2419, M92, and the Age Gradient in the Galactic Halo
• Discovery of an anomalous Sub Giant Branch in the Color Magnitude Diagram of omega Centauri
• Blue Straggler Stars in the Unusual Globular Cluster NGC 6388
• A Panchromatic Study of the Globular Cluster NGC 1904. I: The Blue Straggler Population
• Spectroscopic Analyses of the Blue Hook Stars in NGC 2808: A More Stringent Test of the Late Hot Flasher Scenario
• Resolving subdwarf B stars in binaries by HST imaging
• The central density cusp of the Sagittarius dwarf spheroidal galaxy
• The Blue Straggler Population of the Globular Cluster M5
• A Correlation between Blue Straggler and Binary Fractions in the core of Galactic Globular Clusters
• CCD Photometry of the Globular Cluster omega Centauri. II. Stellar Populations and Age-Metallicity Relation
• The surprising external upturn of the Blue Straggler radial distribution in M55
• On the remote Galactic globular cluster NGC 2419
• The surface brightness profile of the remote cluster NGC 2419
• The extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars
• The Blue Straggler population in the globular cluster M53 (NGC5024): a combined HST, LBT, CFHT study

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• News from the Galactic suburbia: the chemical composition of the remote globular cluster NGC 2419
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• Do globular clusters possess Dark Matter halos? A case study in NGC 2419
• Globular cluster systems in nearby dwarf galaxies - II. Nuclear star clusters and their relation to massive Galactic globular clusters
• Monte Carlo Simulations of Globular Cluster Evolution. V. Binary Stellar Evolution
• The globular cluster NGC 2419: a crucible for theories of gravity
• Double Blue Straggler sequences in GCs: the case of NGC 362
• The velocity dispersion and mass-to-light ratio of the remote halo globular cluster NGC 2419
• Investigating mass segregation process in globular clusters with Blue Straggler Stars: the impact of dark remnants
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XV. The dynamical clock: reading cluster dynamical evolution from the segregation level of blue straggler stars
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• Blue Straggler masses from pulsation properties. I. The case of NGC6541
• NGC 2419: a large and extreme second generation in a currently undisturbed cluster
• Potassium: a new actor on the globular cluster chemical evolution stage. The case of NGC 2808
• Radial distributions of sub-populations in the globular cluster M15: a more centrally concentrated primordial population
• The Structure of the Sagittarius Stellar Stream as Traced by Blue Horizontal Branch Stars
• A New Census of the variable star population in the Globular Cluster NGC 2419
• No evidence of mass segregation in the low mass Galactic globular cluster NGC 6101
• UV Properties of Galactic Globular Clusters with GALEX I. The Color-Magnitude Diagrams
• The non-segregated population of blue straggler stars in the remote globular cluster Palomar 14
• Polytropic model fits to the globular cluster NGC 2419 in Modified Newtonian Dynamics
• The "UV-route" to search for Blue Straggler Stars in Globular Clusters: first results from the HST UV Legacy Survey
• Multiwavelength photometry in the Globular Cluster M2
• Structural parameters and blue stragglers in Sagittarius dwarf spheroidal galaxy globular clusters
• Ultra-deep GEMINI near-infrared observations of the bulge globular cluster NGC 6624
• A kinematic view of NGC 1261: structural parameters, internal dispersion, absolute proper motion and Blue Straggler Stars
• Optical Identification of He White Dwarfs Orbiting Four Millisecond Pulsars in the Globular Cluster 47 Tucanae
• The "dynamical clock": dating the internal dynamical evolution of star clusters with Blue Straggler Stars
• A Re-Evaluation of the Evolved Stars in the Globular Cluster M13
• Two distinct red giant branch populations in the globular cluster NGC 2419 as tracers of a merger event in the Milky Way
• Evidence for multiple populations in the massive globular cluster NGC 2419 from deep uVI LBT photometry
• Star density profiles of six old star clusters in the Large Magellanic Cloud
• The binary mass transfer origin of the red blue straggler sequence in M30
• The Unimodal Distribution Of Blue Straggler Stars in M75 (NGC 6864)
• Radio Timing and Optical Photometry of the Black Widow System PSR J1953+1846A in the Globular Cluster M71
• Dynamical friction in multi-component evolving globular clusters
• Deep multi-telescope photometry of NGC 5466. I. Blue Stragglers and binary systems
• The Luminosity Function and stellar Mass to Light ratio of the massive globular cluster NGC2419
• Spectral Energy Distribution of Blue Stragglers in the core of 47 Tucanae
• Mass segregation in the outer halo globular cluster Palomar 14
• Weighing stars: the identification of an Evolved Blue Straggler Star in the globular cluster 47 Tucanae
• The double Blue Straggler sequence in NGC2173: a field contamination artefact
• Spinning like a Blue Straggler: the population of fast rotating Blue Straggler stars in Omega Centauri
• Evolved Stars in the Core of the Massive Globular Cluster NGC 2419
• Blue straggler evolution caught in the act in the Large Magellanic Cloud globular cluster Hodge 11
• The globular cluster NGC 6642: Evidence for a depleted mass function in a very old cluster
• Probing the role of dynamical friction in shaping the BSS radial distribution. I - Semi-analytical models and preliminary N-body simulations
• UV observations of the globular cluster M10 from HST and GALEX. The BSS population
• On the radial distribution of horizontal branch stars in ngc2808
• Empirical measurement of the dynamical ages of three globular clusters and some considerations on the use of the dynamical clock
• Blue Hook Stars in Globular Clusters
• Deep multi-telescope photometry of NGC 5466. II. The radial behaviour of the mass function slope
• The central Blue Straggler population in four outer-halo globular clusters
• UV-Bright Stellar Populations and Their Evolutionary Implications in the Collapsed-Core Cluster M15
• Modeling and Analysis of a Spectrum of the Globular Cluster NGC 2419
• Hubble Space Telescope photometry of multiple stellar populations in the inner parts of NGC 2419
• The structural properties of multiple populations in the dynamically young globular cluster NGC 2419
• Stellar-Encounter Driven Red-Giant Star Mass-Loss in Globular Clusters
• Blue Straggler Stars in Globular Clusters: a powerful tool to probe the internal dynamical evolution of stellar systems
• Investigating the Blue Straggler Stars radial distribution in globular clusters with Monte Carlo simulations
• The MOND External Field Effect on the Dynamics of the Globular Clusters: General Considerations and Application to NGC 2419
• The radial distribution of Blue stragglers in Galactic Globular Cluster NGC 6656 $-$ Clues on the dynamical status
• An analysis of the blue straggler population in the Sgr dSph globular cluster Arp 2
• Blue Straggler Bimodality: a Brownian Motion Model
• Blue straggler stars beyond the Milky Way: a non-segregated population in the Large Magellanic Cloud cluster NGC 2213
• A VIMOS spectroscopy of photometric variables and straggler candidates in omega Centauri
• Searching for exotic object companions in the dense core of NGC 362: a multi-wavelength and multi-epoch photometric analysis
• WFPC2 UV survey of Galactic Globular Clusters. The Horizontal Branch temperature distribution
• Exotic populations in Globular Clusters: Blue Stragglers as tracers of the internal dynamical evolution of stellar systems
• Study of dynamical status of the globular cluster NGC 1851 using Ultraviolet Imaging Telescope
• Taking apart the dynamical clock. Fat-tailed dynamical kicks shape the blue-straggler star bimodality