A Deep Search for Faint Chandra X-ray Sources, Radio Sources, and Optical Counterparts in NGC 6752

Abstract

We report the results of a deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in the nearby, core-collapsed globular cluster, NGC 6752. We combined new and archival Chandra imaging to detect 51 X-ray sources (12 of which are new) within the 1.9 arcmin half-light radius. Three radio sources in deep ATCA 5 and 9 GHz radio images match with Chandra sources. We have searched for optical identifications for the expanded Chandra source list using deep Hubble Space Telescope photometry in B, R, H-alpha, UV, and U. Among the entire sample of 51 Chandra sources, we identify 18 cataclysmic variables (CVs), 9 chromospherically active binaries (ABs), 3 red giants (RGs), 3 galaxies (GLXs), and 6 active galactic nuclei (AGNs). Three of the sources are associated with millisecond pulsars (MSPs). As in our previous study of NGC 6752, we find that the brightest CVs appear to be more centrally concentrated than are the faintest CVs, although the effect is no longer statistically significant as a consequence of the inclusion in the faint group of two intermediate brightness CVs. This possible difference in the radial distributions of the bright and faint CV groups appears to indicate that mass segregation has separated them. We note that photometric incompleteness in the crowded central region of the cluster may also play a role. Both groups of CVs have an inferred mass above that of the main-sequence turnoff stars. We discuss the implications for the masses of the CV components.

arXiv comment35 pages, 30 figures

References in corpus (83)

• Gaia Data Release 2. Summary of the contents and survey properties
• On the Absorption of X-rays in the Interstellar Medium
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• A Wavelet-Based Algorithm for the Spatial Analysis of Poisson Data
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• The ACS Survey of Galactic Globular Clusters. XII. Photometric Binaries along the Main-Sequence
• An ACS Survey of Globular Clusters V: Star Catalog for Each Cluster
• Dynamical Formation of Close Binary Systems in Globular Clusters
• A Hydrogen Atmosphere Spectral Model Applied to the Neutron Star X7 in the Globular Cluster 47 Tucanae
• Innovations in the Analysis of Chandra-ACIS Observations
• Post-common-envelope binaries from SDSS. XI: The white dwarf mass distributions of CVs and pre-CVs
• The DRAGON simulations: globular cluster evolution with a million stars
• Dynamical evolution of black hole sub-systems in idealised star clusters
• A Deep Chandra Survey of the Globular Cluster 47 Tucanae: Catalog of Point Sources
• The pulsar spectral index distribution
• A Volume Limited Sample of Cataclysmic Variables from $Gaia$ DR2: Space Density and Population Properties
• The UV and X-ray activity of the M dwarfs within 10pc of the Sun
• Two distinct sequences of blue straggler stars in the globular cluster M30
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XVII. Public Catalogue Release
• Analysis of the Quiescent Low-Mass X-ray Binary Population in Galactic Globular Clusters
• The Frequency of Binary Stars in the Core of 47 Tucanae
• Monte Carlo Simulations of Globular Cluster Evolution. III. Primordial Binary Interactions
• Formation and evolution of compact binaries in globular clusters: I.Binaries with white dwarfs
• Dynamical Formation of Close Binaries in Globular Clusters II: Cataclysmic Variables
• Deep radio imaging of 47 Tuc identifies the peculiar X-ray source X9 as a new black hole candidate
• Massive Black Holes in Star Clusters. I. Equal-mass clusters
• Three in one go: consequential angular momentum loss can solve major problems of CV evolution
• Discovery of short-period binary millisecond pulsars in four globular clusters
• Stellar Encounter Rate in Galactic Globular Clusters
• The MAVERIC Survey: Still No Evidence for Accreting Intermediate-mass Black Holes in Globular Clusters
• X-ray Processing of ChaMPlane Fields: Methods and Initial Results for Selected Anti-Galactic Center Fields
• An Extensive Census of HST Counterparts to Chandra X-ray Sources in the Globular Cluster 47 Tucanae. I. Astrometry and Photometry
• Double Blue Straggler sequences in GCs: the case of NGC 362
• On the disruption of pulsar and X-ray binaries in globular clusters
• Optical Identification of Multiple Faint X-ray Sources in the Globular Cluster NGC 6752: Evidence for Numerous Cataclysmic Variables
• How initial size governs core collapse in globular clusters
• Eight new millisecond pulsars from the first MeerKAT globular cluster census
• The puzzling dynamical status of the core of the globular cluster NGC 6752
• Timing of Millisecond Pulsars in NGC 6752: Evidence for a High Mass-to-Light Ratio in the Cluster Core
• Intermediate Mass Black Hole Induced Quenching of Mass Segregation in Star Clusters
• The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems
• A Far-Ultraviolet Survey of 47 Tucanae. I. Imaging
• A Chandra X-ray Observatory Study of PSR J1740--5340 and Candidate Millisecond Pulsars in the Globular Cluster NGC 6397
• Simultaneous Chandra and VLA Observations of the Transitional Millisecond Pulsar PSR J1023+0038: Anti-correlated X-ray and Radio Variability
• Identification of Faint Chandra X-ray Sources in the Core-Collapsed Globular Cluster NGC 6397: Evidence for a Bimodal Cataclysmic Variable Population
• The case of PSR J1911-5958A in the outskirts of NGC 6752: signature of a black hole binary in the cluster core?
• Spectral Types and Masses of White Dwarfs in Globular Clusters
• MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- IV. cataclysmic variables -- properties of bright and faint populations
• Atomic Diffusion and Mixing in Old Stars V: A deeper look into the Globular Cluster NGC 6752
• The Lynx Mission Concept Study Interim Report
• New Cataclysmic Variables and other Exotic Binaries in the Globular Cluster 47 Tucanae
• A Far-Ultraviolet Survey of 47 Tucanae.II The Long-Period Cataclysmic Variable AKO 9
• Chandra X-ray Sources in the Collapsed-Core Globular Cluster M30 (NGC 7099)
• N-body simulations of globular clusters in tidal fields: Effects of intermediate-mass black holes
• A Deep X-ray Survey of the Globular Cluster Omega Centauri
• A {\it Chandra} Survey of Milky Way Globular Clusters I: Emissivity and Abundance of Weak X-ray Sources
• The MAVERIC Survey: Chandra/ACIS Catalog of Faint X-ray sources in 38 Galactic globular clusters
• Chandra and Hubble Space Telescope Study of the Globular Cluster NGC 288
• A Chandra Look at the X-ray Faint Millisecond Pulsars in the Globular Cluster NGC 6752
• A Far-UV Survey of M 80: X-ray Source Counterparts, Strange Blue Stragglers and the Recovery of Nova T Sco
• Unveiling the core of the Globular Cluster M15 in the Ultraviolet
• Dynamical Formation of Cataclysmic Variables in Globular Clusters
• The binary mass transfer origin of the red blue straggler sequence in M30
• HST/ACS Imaging of Omega Centauri: Optical Counterparts of Chandra X-Ray Sources
• A Chandra Study of the Galactic Globular Cluster Omega Centauri
• Discovery of a double Blue Straggler sequence in M15: new insight into the core-collapse process
• Optical identification of the companion to PSR J1911-5958A, the pulsar binary in the outskirts of NGC 6752
• Radio sources in the Chandra Galactic Bulge survey
• Identification of Faint Chandra X-ray Sources in the Core-Collapsed Globular Cluster NGC 6752
• A stellar census in globular clusters with MUSE: A spectral catalogue of emission-line sources
• The MAVERIC survey: A hidden pulsar and a black hole candidate in ATCA radio imaging of the globular cluster NGC 6397
• Interrupted Binary Mass Transfer in Star Clusters
• Magnetic dynamos in white dwarfs -- I. Explaining the dearth of bright intermediate polars in globular clusters
• The X-ray Emissivity of Low-Density Stellar Populations
• The MAVERIC Survey: New compact binaries revealed by deep radio continuum observations of the Galactic globular cluster Terzan 5
• A multi-wavelength survey of NGC\,6752: X-ray counterparts, two new dwarf novae, and a core-collapsed radial profile
• Far-Ultraviolet Observation of the Globular Cluster NGC 6397
• A deep Chandra survey for faint X-ray sources in the Galactic globular cluster M30, and searches for optical and radio counterparts
• UV-Bright Stellar Populations and Their Evolutionary Implications in the Collapsed-Core Cluster M15
• GS 2000+25: The Least Luminous Black Hole X-ray Binary
• Celestial position of the companion of PSR J1740-5340
• Near-ultraviolet detections of four dwarf nova candidates in the globular cluster 47 Tucanae
• A Far-UV Variability Survey of the Globular Cluster M80

Cited by in corpus (7)

• Formation and Evolution of Accreting Compact Objects
• The MAVERIC survey: A catalogue of radio sources in southern globular clusters from the Australia Telescope Compact Array
• A comparison of millisecond pulsar populations between globular clusters and the Galactic field
• Exotica in the Globular Cluster M4, Studied with Chandra, HST, and the VLA
• Single Millisecond Pulsars from Dynamical Interaction Processes in Dense Star Clusters
• Exploration of faint X-ray and radio sources in the massive globular cluster M14: A UV-bright counterpart to Nova Ophiuchus 1938
• Reevaluating the Origin of Detectable Cataclysmic Variables in Globular Clusters: Testing the Importance of Dynamics