Chandra x-ray sources in the collapsed-core globular cluster M30 (NGC 7099)
Lugger, Phyllis M.
Cohn, Haldan N.
Heinke, Craig O.
Grindlay, Jonathan E.
Edmonds, Peter D.
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CitationLugger, Phyllis M., Haldan N. Cohn, Craig O. Heinke, Jonathan E. Grindlay, and Peter D. Edmonds. 2007. “ChandraX‐Ray Sources in the Collapsed‐Core Globular Cluster M30 (NGC 7099).” The Astrophysical Journal 657 (1): 286–301. https://doi.org/10.1086/507572.
AbstractWe report the detection of six discrete, low-luminosity (L-X < 10(33) ergs s(-1)) X- ray sources, located within 12" of the center of the collapsed-core globular cluster M30 (NGC 7099), and a total of 13 sources within the half-mass radius, from a 50 ks Chandra ACIS-S exposure. Three sources lie within the very small upper limit of 1.9" on the core radius. The brightest of the three core sources has a luminosity of L-X(0.5-6 keV) approximate to 6 x 10(32) ergs s(-1) and a blackbody-like soft X-ray spectrum, which are both consistent with it being a quiescent low-mass X-ray binary (qLMXB). We have identified optical counterparts to four of the six central sources and a number of the outlying sources, using deep Hubble Space Telescope and ground-based imaging. While the two proposed counterparts that lie within the core may represent chance superpositions, the two identified central sources that lie outside of the core have X- ray and optical properties consistent with being cataclysmic variables (CVs). Two additional sources outside of the core have possible active binary counterparts. We discuss the X-ray source population of M30 in light of its collapsed-core status.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41399948
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