Chandra X-ray Sources in the Collapsed-Core Globular Cluster M30 (NGC 7099)

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dc.creatorLugger, Phyllis M.
dc.creatorCohn, Haldan N.
dc.creatorHeinke, Craig O.
dc.creatorGrindlay, Jonathan E.
dc.creatorEdmonds, Peter D.
dc.date2006-06-15
dc.date.accessioned2026-07-07T10:23:11Z
dc.date.available2026-07-07T10:23:11Z
dc.descriptionWe report the detection of six discrete, low-luminosity (Lx < 10^33 erg/s) X-ray sources, located within 12 arcsec 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 ksec Chandra ACIS-S exposure. Three sources lie within the very small upper limit of 1.9 arcsec on the core radius. The brightest of the three core sources has a luminosity of Lx (0.5-6 keV) = 6x10^32 erg/s 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 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.
dc.description18 pages, 13 figures (8 color), resubmitted to ApJ after incorporating referee comments
dc.identifierhttps://arxiv.org/abs/astro-ph/0606382
dc.identifierhttp://arxiv.org/abs/astro-ph/0606382
dc.identifierAstrophys.J.657:286-301,2007
dc.identifierdoi:10.1086/507572
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175741
dc.subjectAstrophysics
dc.titleChandra X-ray Sources in the Collapsed-Core Globular Cluster M30 (NGC 7099)
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