Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal
  Galaxy
  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.
