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dc.contributor.authorWright, N.J.
dc.contributor.authorDrake, J.J.
dc.contributor.authorCivano, F.
dc.identifier.citationWright , N J , Drake , J J & Civano , F 2010 , ' Stellar x-ray sources in the chandra cosmos survey ' , Astrophysical Journal Letters , vol. 725 , no. 1 , pp. 480-491 .
dc.identifier.otherPURE: 1268321
dc.identifier.otherPURE UUID: 7e640a77-a93a-4511-a1e1-cafea3e9977d
dc.identifier.otherScopus: 78650029982
dc.descriptionCopyright 2011 Elsevier B.V., All rights reserved.
dc.description.abstractWe present an analysis of the X-ray properties of a sample of solar- and late-type field stars identified in the Chandra Cosmic Evolution Survey (COSMOS), a deep (160 ks) and wide (∼0.9 deg ) extragalactic survey. The sample of 60 sources was identified using both morphological and photometric star/galaxy separation methods. We determine X-ray count rates, extract spectra and light curves, and perform spectral fits to determine fluxes and plasma temperatures. Complementary optical and near-IR photometry is also presented and combined with spectroscopy for 48 of the sources to determine spectral types and distances for the sample. We find distances ranging from 30 pc to ∼12 kpc, including a number of the most distant and highly active stellar X-ray sources ever detected. This stellar sample extends the known coverage of the LX-distance plane to greater distances and higher luminosities, but we do not detect as many intrinsically faint X-ray sources compared to previous surveys. Overall the sample is typically more luminous than the active Sun, representing the high-luminosity end of the disk and halo X-ray luminosity functions. The halo population appears to include both low-activity spectrally hard sources that may be emitting through thermal bremsstrahlung, as well as a number of highly active sources in close binaries.en
dc.relation.ispartofAstrophysical Journal Letters
dc.titleStellar x-ray sources in the chandra cosmos surveyen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.typeJournal Article/Review

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