The XMM-Newton Wide Angle Survey (XWAS)
The XMM-Newton Wide Angle Survey (XWAS)
复制标题
XMM-牛顿广角测量 (XWAS)
DOI:
10.1051/0004-6361/201218832
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发表时间:
2013
影响因子:
6.5
通讯作者:
Esquej P
中科院分区:
文献类型:
--
作者:
Esquej P
Aims.This programme is aimed at obtaining one of the largest X-ray selected samples of identified active galactic nuclei to date in order to characterise such a population at intermediate fluxes, where most of the Universe’s accretion power originates. We present theXMM-NewtonWide Angle Survey (XWAS), a new catalogue of almost a thousand X-ray sources spectroscopically identified through optical observations.Methods.A sample of X-ray sources detected in 68XMM-Newtonpointed observations was selected for optical multi-fibre spectroscopy. Optical counterparts and corresponding photometry of the X-ray sources were obtained from the SuperCOSMOS Sky Survey. Candidates for spectroscopy were initially selected with magnitudes down toR~ 21, with preference for X-ray sources having a fluxF0.5−4.5 keV≥ 10-14erg s-1cm-2. Optical spectroscopic observations were made using the Two Degree Field of the Anglo Australian Telescope, and the resulting spectra were classified based on optical emission lines.Results.We have identified through optical spectroscopy 940 X-ray sources over Ω ~ 11.8 deg2of the sky. Source populations in our sample can be summarised as 65% broad line active galactic nuclei (BLAGN), 16% narrow emission line galaxies (NELGs), 6% absorption line galaxies (ALGs) and 13% stars. An active nucleus is also likely to be present in the large majority of the X-ray sources spectroscopically classified as NELGs or ALGs. Sources lie in high-galactic latitude (|b| > 20 deg)XMM-Newtonfields mainly in the southern hemisphere. Owing to the large parameter space in redshift (0 ≤z≤ 4.25) and flux (10-15≤F0.5 − 4.5 keV≤ 10-12erg s-1cm-2) covered by the XWAS this work provides an excellent resource for the further study of subsamples and particular cases. The overall properties of the extragalactic objects are presented in this paper. These include the redshift and luminosity distributions, optical and X-ray colours and X-ray-to-optical flux ratios.
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DOI:
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发表时间:
2004
期刊:
影响因子:
--
作者:
I. Georgantopoulos;A. Georgakakis
通讯作者:
A. Georgakakis
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
M. Zombeck
通讯作者:
M. Zombeck
DOI:
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发表时间:
2006
期刊:
影响因子:
--
作者:
A. Georgakakis;K. Nandra;E. Laird;S. Gwyn;C. Steidel;V. Sarajedini;P. Barmby;S. Faber;A. Coil;M. Cooper;M. Davis;J. A. N. I. College;UCOLick;Victoria;Caltech;Florida;Cfa;Steward Observatory;Berkeley
通讯作者:
Berkeley
DOI:
10.1086/444378
发表时间:
2005
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
作者:
S. Murray;A. Kenter;W. Forman;C. Jones;P. Green;C. Kochanek;A. Vikhlinin;D. Fabricant;G. Fazio;K. Brand;Michael J. I. Brown;A. Dey;B. Jannuzi;J. Najita;B. McNamara;J. Shields;M. Rieke
通讯作者:
M. Rieke
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
S. Mateos;X. Barcons;F. Carrera;M. Ceballos;A. Caccianiga;G. Lamer;T. Maccacaro;M. Page;A. Schwope;M. Watson
通讯作者:
M. Watson