University of Hertfordshire

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Stellar x-ray sources in the chandra cosmos survey

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Stellar x-ray sources in the chandra cosmos survey. / Wright, N.J.; Drake, J.J.; Civano, F.

In: Astrophysical Journal Letters, Vol. 725, No. 1, 10.12.2010, p. 480-491.

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Wright, N.J. ; Drake, J.J. ; Civano, F. / Stellar x-ray sources in the chandra cosmos survey. In: Astrophysical Journal Letters. 2010 ; Vol. 725, No. 1. pp. 480-491.

Bibtex

@article{7e640a77a93a4511a1e1cafea3e9977d,
title = "Stellar x-ray sources in the chandra cosmos survey",
abstract = "We 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.",
author = "N.J. Wright and J.J. Drake and F. Civano",
note = "Copyright 2011 Elsevier B.V., All rights reserved.",
year = "2010",
month = dec,
day = "10",
doi = "10.1088/0004-637X/725/1/480",
language = "English",
volume = "725",
pages = "480--491",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "1",

}

RIS

TY - JOUR

T1 - Stellar x-ray sources in the chandra cosmos survey

AU - Wright, N.J.

AU - Drake, J.J.

AU - Civano, F.

N1 - Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2010/12/10

Y1 - 2010/12/10

N2 - We 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.

AB - We 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.

UR - http://www.scopus.com/inward/record.url?scp=78650029982&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/725/1/480

DO - 10.1088/0004-637X/725/1/480

M3 - Article

AN - SCOPUS:78650029982

VL - 725

SP - 480

EP - 491

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 1

ER -