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Article Dans Une Revue Astrophys.J. Année : 2020

The MAVERIC Survey: Chandra/ACIS Catalog of Faint X-ray sources in 38 Galactic globular clusters

Arash Bahramian
  • Fonction : Auteur
Jay Strader
James C.A. Miller-Jones
  • Fonction : Auteur
Laura Chomiuk
  • Fonction : Auteur
Craig O. Heinke
  • Fonction : Auteur
Thomas J. Maccarone
  • Fonction : Auteur
David Pooley
  • Fonction : Auteur
Laura Shishkovsky
  • Fonction : Auteur
Vlad Tudor
  • Fonction : Auteur
Yue Zhao
Kwan Lok Li
  • Fonction : Auteur
Gregory R. Sivakoff
  • Fonction : Auteur
Johannes Buchner
  • Fonction : Auteur

Résumé

Globular clusters host a variety of lower-luminosity (L X < 1035 erg s−1) X-ray sources, including accreting neutron stars (NSs) and  black holes (BHs), millisecond pulsars (MSPs), cataclysmic variables, and chromospherically active binaries. In this paper, we provide a comprehensive catalog of more than 1100 X-ray sources in 38 Galactic globular clusters (GCs) observed by the Chandra X-ray Observatory’s Chandra/ACIS detector. The targets are selected to complement the MAVERIC survey’s deep radio continuum maps of Galactic GCs. We perform photometry and spectral analysis for each source, determine a best-fit model, and assess the possibility of it being a foreground or background source based on its spectral properties and location in the cluster. We also provide basic assessments of variability. We discuss the distribution of X-ray binaries in GCs and their X-ray luminosity function, and we carefully analyze systems with L X > 1033 erg s−1. Among these moderately bright systems, we discover a new source in NGC 6539 that may be a candidate accreting stellar-mass BH or a transitional MSP. We show that quiescent NS low-mass X-ray binaries in GCs may spend ∼2% of their lifetimes as transitional MSPs in their active (L X > 1033 erg s−1) state. Finally, we identify a substantial underabundance of bright (L X > 1033 erg s−1) intermediate polars in GCs compared to the Galactic field, in contrast with the literature of the past two decades.

Dates et versions

hal-02908362 , version 1 (28-07-2020)

Identifiants

Citer

Arash Bahramian, Jay Strader, James C.A. Miller-Jones, Laura Chomiuk, Craig O. Heinke, et al.. The MAVERIC Survey: Chandra/ACIS Catalog of Faint X-ray sources in 38 Galactic globular clusters. Astrophys.J., 2020, 901 (1), pp.57. ⟨10.3847/1538-4357/aba51d⟩. ⟨hal-02908362⟩
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