SWIRE/Chandra survey in Lockman Hole Field Virtual Observatory Resource

Authors
  1. Wilkes B.J.
  2. Kilgard R.
  3. Kim D.-W.
  4. Kim M.
  5. Polletta M.
  6. Lonsdale C.,Smith H.E.
  7. Surace J.
  8. Owen F.N.
  9. Franceschini A.
  10. Siana B.
  11. Shupe D.
  12. Published by
    CDS
Abstract

We report a moderate-depth (70ks), contiguous 0.7deg^2^ Chandra survey in the Lockman Hole Field of the Spitzer/SWIRE Legacy Survey coincident with a completed, ultra-deep VLA survey with deep optical and near-infrared imaging in-hand. The primary motivation is to distinguish starburst galaxies and active galactic nuclei (AGNs), including the significant, highly obscured (logN_H_>23) subset. Chandra has detected 775 X-ray sources to a limiting broadband (0.3-8keV) flux ~4x10^-16^erg/cm^2^/s. We present the X-ray catalog, fluxes, hardness ratios, and multi-wavelength fluxes. The logN versus logS agrees with those of previous surveys covering similar flux ranges. The Chandra and Spitzer flux limits are well matched: 771 (99%) of the X-ray sources have infrared (IR) or optical counterparts, and 333 have MIPS 24um detections. There are four optical-only X-ray sources and four with no visible optical/IR counterpart. The very deep (~2.7uJy rms) VLA data yield 251 (>4{sigma}) radio counterparts, 44% of the X-ray sources in the field. More than 40% of the X-ray sources in the VLA field are radio-loud using the classical definition, RL. The majority of these are red and relatively faint in the optical so that the use of RL to select those AGNs with the strongest radio emission becomes questionable. Using the 24um to radio flux ratio (q_24_) instead results in 13 of the 147 AGNs with sufficient data being classified as radio-loud, in good agreement with the ~10% expected for broad-lined AGNs based on optical surveys. We conclude that q_24_ is a more reliable indicator of radio-loudness. Use of RL should be confined to the optically selected type 1 AGN.

Keywords
  1. x-ray-sources
  2. infrared-photometry
  3. visible-astronomy
  4. Wide-band photometry
  5. astronomical-object-identification
  6. surveys
  7. active-galactic-nuclei
Bibliographic source Bibcode
2009ApJS..185..433W
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/185/433
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/185/433
Document Object Identifer DOI
doi:10.26093/cds/vizier.21850433

Access

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/185/433
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History

2010-05-31T20:26:16Z
Resource record created
2010-05-31T20:26:16Z
Created
2017-11-10T11:16:31Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr