Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal Galaxy. (arXiv:1902.08635v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Arnason_R/0/1/0/all/0/1">R. M. Arnason</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barmby_P/0/1/0/all/0/1">P. Barmby</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Bahramian_A/0/1/0/all/0/1">A. Bahramian</a> (2,3), <a href="http://arxiv.org/find/astro-ph/1/au:+Maccarone_T/0/1/0/all/0/1">T. J. Maccarone</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Zepf_S/0/1/0/all/0/1">S. E. Zepf</a> (3) ((1) University of Western Ontario, (2) Curtin University, (3) Michigan State University, (4) Texas Tech University)
We present an unprecedented, deep study of the primordial low-mass X-ray
binary population in an isolated, lower-metallicity environment. We perform
followup observations of previously-identified X-ray binary candidates in the
Sculptor Dwarf Galaxy by combining a second Chandra observation with Spitzer
and Gemini photometry, as well as Gemini spectroscopy of selected targets. Of
the original nine bright X-ray sources identified, we are able to classify all
but one as quasars, active galactic nuclei, or background galaxies. We further
discover four new X-ray sources in the second-epoch Chandra observation. Three
of these new sources are background sources and one is a foreground flaring
star. We have found that Sculptor is effectively devoid of X-ray sources above
a few 1e34 erg/s. If Sculptor is able to retain primordial binaries at a
similar rate to globular clusters, this implies that bright X-ray binaries
observed in globular clusters in the present epoch are all formed dynamically.
We present an unprecedented, deep study of the primordial low-mass X-ray
binary population in an isolated, lower-metallicity environment. We perform
followup observations of previously-identified X-ray binary candidates in the
Sculptor Dwarf Galaxy by combining a second Chandra observation with Spitzer
and Gemini photometry, as well as Gemini spectroscopy of selected targets. Of
the original nine bright X-ray sources identified, we are able to classify all
but one as quasars, active galactic nuclei, or background galaxies. We further
discover four new X-ray sources in the second-epoch Chandra observation. Three
of these new sources are background sources and one is a foreground flaring
star. We have found that Sculptor is effectively devoid of X-ray sources above
a few 1e34 erg/s. If Sculptor is able to retain primordial binaries at a
similar rate to globular clusters, this implies that bright X-ray binaries
observed in globular clusters in the present epoch are all formed dynamically.
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