Published in

Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 2(485), p. 2259-2275, 2019

DOI: 10.1093/mnras/stz554

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

Journal article published in 2019 by R. M. Arnason, P. Barmby ORCID, A. Bahramian ORCID, T. J. Maccarone, S. E. Zepf
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

Abstract 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.

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