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The discovery of X-ray binaries in the sculptor dwarf spheroidal galaxy

Maccarone, Thomas J., Kundu, Arunav, Zepf, Stephen E., Piro, Anthony L. and Bildsten, Lars (2006) The discovery of X-ray binaries in the sculptor dwarf spheroidal galaxy Proceedings of the International Astronomical Union, (1), pp. 175-179. (doi:10.1017/S1743921306008143).

Record type: Article


We report the results of a deep Chandra survey of the Sculptor dwarf spheroidal galaxy. We find five X-ray sources with LX of at least 6 × 1033 ergs-1 with optical counterparts establishing them as members of Sculptor. These X-ray luminosities indicate that these sources are X-ray binaries, as no other known class of Galactic point sources can reach 0.5-8 keV luminosities this high. Finding these systems proves definitively that such objects can exist in an old stellar population without stellar collisions. Three of these objects have highly evolved optical counterparts (giants or horizontal branch stars), as do three other sources whose X-ray luminosities are in the range which includes both quiescent low-mass X-ray binaries and the brightest magnetic cataclysmic variables. We predict that large area surveys of the Milky Way should also turn up large numbers of quiescent X-ray binaries.

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Published date: 12 May 2006
Keywords: X-rays:binaries, X-rays:galaxies, stars:binaries:close, galaxies:individual:sculptor dwarf spheroidal, stellar dynamics – stars:population II.


Local EPrints ID: 79517
PURE UUID: c3adb428-be71-4309-94ed-ac3caeaea8ec

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Date deposited: 16 Mar 2010
Last modified: 18 Jul 2017 23:17

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Author: Thomas J. Maccarone
Author: Arunav Kundu
Author: Stephen E. Zepf
Author: Anthony L. Piro
Author: Lars Bildsten

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