The MAVERIC Survey: Chandra/ACIS Catalog of Faint X-ray sources in 38 Galactic globular clusters. (arXiv:2007.04581v1 [astro-ph.HE])

The MAVERIC Survey: Chandra/ACIS Catalog of Faint X-ray sources in 38 Galactic globular clusters. (arXiv:2007.04581v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bahramian_A/0/1/0/all/0/1">Arash Bahramian</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Strader_J/0/1/0/all/0/1">Jay Strader</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miller_Jones_J/0/1/0/all/0/1">James C. A. Miller-Jones</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chomiuk_L/0/1/0/all/0/1">Laura Chomiuk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Heinke_C/0/1/0/all/0/1">Craig O. Heinke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Maccarone_T/0/1/0/all/0/1">Thomas J. Maccarone</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pooley_D/0/1/0/all/0/1">David Pooley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shishkovsky_L/0/1/0/all/0/1">Laura Shishkovsky</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tudor_V/0/1/0/all/0/1">Vlad Tudor</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhao_Y/0/1/0/all/0/1">Yue Zhao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_K/0/1/0/all/0/1">Kwan Lok Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sivakoff_G/0/1/0/all/0/1">Gregory R. Sivakoff</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tremou_E/0/1/0/all/0/1">Evangelia Tremou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Buchner_J/0/1/0/all/0/1">Johannes Buchner</a>

Globular clusters host a variety of lower-luminosity ($L_X<10^{35}$ erg
s$^{-1}$) X-ray sources, including accreting neutron stars and black holes,
millisecond pulsars, 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 observed by the Chandra X-ray
Observatory’s ACIS detector. The targets are selected to complement the MAVERIC
survey’s deep radio continuum maps of Galactic globular clusters. We perform
photometry and spectral analysis for each source, determine a best-fit model,
and assess the possibility of it being a foreground/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
globular clusters, their X-ray luminosity function, and 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 black hole or a transitional millisecond pulsar. We show that
quiescent neutron star LMXBs in globular clusters may spend ~2% of their
lifetimes as transitional millisecond pulsars in their active ($L_X>10^{33}$
erg s$^{-1}$) state. Finally, we identify a substantial under-abundance of
bright ($L_X>10^{33}$ erg s$^{-1}$) intermediate polars in globular clusters
compared to the Galactic field, in contrast with the literature of the past two
decades.

Globular clusters host a variety of lower-luminosity ($L_X<10^{35}$ erg
s$^{-1}$) X-ray sources, including accreting neutron stars and black holes,
millisecond pulsars, 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 observed by the Chandra X-ray
Observatory’s ACIS detector. The targets are selected to complement the MAVERIC
survey’s deep radio continuum maps of Galactic globular clusters. We perform
photometry and spectral analysis for each source, determine a best-fit model,
and assess the possibility of it being a foreground/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
globular clusters, their X-ray luminosity function, and 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 black hole or a transitional millisecond pulsar. We show that
quiescent neutron star LMXBs in globular clusters may spend ~2% of their
lifetimes as transitional millisecond pulsars in their active ($L_X>10^{33}$
erg s$^{-1}$) state. Finally, we identify a substantial under-abundance of
bright ($L_X>10^{33}$ erg s$^{-1}$) intermediate polars in globular clusters
compared to the Galactic field, in contrast with the literature of the past two
decades.

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