TY - JOUR
T1 - Multiwavelength survey of X-ray sources in the sculptor dwarf spheroidal galaxy
AU - Arnason, R. M.
AU - Barmby, P.
AU - Bahramian, A.
AU - Maccarone, T. J.
AU - Zepf, S. E.
N1 - Publisher Copyright:
© 2019 The Author(s).
PY - 2019/2/15
Y1 - 2019/2/15
N2 - We present an unprecedented, deep study of the primordial low-mass X-ray binary population in an isolated, lower metallicity environment. We perform follow-up 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 1034 erg s−1. 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.
AB - We present an unprecedented, deep study of the primordial low-mass X-ray binary population in an isolated, lower metallicity environment. We perform follow-up 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 1034 erg s−1. 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.
KW - Galaxies:individual:Sculptor dwarf spheroidal
KW - X-rays:binaries
KW - X-rays:galaxies
UR - http://www.scopus.com/inward/record.url?scp=85067062196&partnerID=8YFLogxK
U2 - 10.1093/mnras/stz554
DO - 10.1093/mnras/stz554
M3 - Article
AN - SCOPUS:85067062196
SN - 0035-8711
VL - 485
SP - 2259
EP - 2275
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -