In:
The Astrophysical Journal, American Astronomical Society, Vol. 901, No. 1 ( 2020-09-01), p. 57-
Abstract:
Globular clusters host a variety of lower-luminosity ( L X 〈 10 35 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 〉 10 33 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 〉 10 33 erg s −1 ) state. Finally, we identify a substantial underabundance of bright ( L X 〉 10 33 erg s −1 ) intermediate polars in GCs compared to the Galactic field, in contrast with the literature of the past two decades.
Type of Medium:
Online Resource
ISSN:
0004-637X
,
1538-4357
DOI:
10.3847/1538-4357/aba51d
DOI:
10.3847/1538-4357/aba51d/data
Language:
Unknown
Publisher:
American Astronomical Society
Publication Date:
2020
detail.hit.zdb_id:
2207648-7
detail.hit.zdb_id:
1473835-1
SSG:
16,12
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