The ROSAT deep survey

II. Optical identification, photometry and spectra of X-ray sources in the Lockman field

M. Schmidt, G. Hasinger, J. Gunn, Donald P. Schneider, R. Burg, R. Giacconi, I. Lehmann, J. MacKenty, J. Trümper, G. Zamorani

Research output: Contribution to journalReview article

189 Citations (Scopus)

Abstract

The ROSAT Deep Survey includes a complete sample of 50 X-ray sources with fluxes in the 0.5-2 keV band larger than 5.5 10-15 erg cm-2 s-1 in the Lockman field (Hasinger et al., Paper I). We have obtained deep broad-band CCD images of the field and spectra of many optical objects near the positions of the X-ray sources. We define systematically the process leading to the optical identifications of the X-ray sources. For this purpose, we introduce five identification (ID) classes that characterize the process in each case. Among the 50 X-ray sources, we identify 39 AGNs, 3 groups of galaxies, 1 galaxy and 3 galactic stars. Four X-ray sources remain unidentified so far; two of these objects may have an unusually large ratio of X-ray to optical flux.

Original languageEnglish (US)
Pages (from-to)495-503
Number of pages9
JournalAstronomy and Astrophysics
Volume329
Issue number2
StatePublished - Jan 20 1998

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photometry
x rays
galaxies
erg
charge coupled devices
broadband
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Schmidt, M., Hasinger, G., Gunn, J., Schneider, D. P., Burg, R., Giacconi, R., ... Zamorani, G. (1998). The ROSAT deep survey: II. Optical identification, photometry and spectra of X-ray sources in the Lockman field. Astronomy and Astrophysics, 329(2), 495-503.
Schmidt, M. ; Hasinger, G. ; Gunn, J. ; Schneider, Donald P. ; Burg, R. ; Giacconi, R. ; Lehmann, I. ; MacKenty, J. ; Trümper, J. ; Zamorani, G. / The ROSAT deep survey : II. Optical identification, photometry and spectra of X-ray sources in the Lockman field. In: Astronomy and Astrophysics. 1998 ; Vol. 329, No. 2. pp. 495-503.
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Schmidt, M, Hasinger, G, Gunn, J, Schneider, DP, Burg, R, Giacconi, R, Lehmann, I, MacKenty, J, Trümper, J & Zamorani, G 1998, 'The ROSAT deep survey: II. Optical identification, photometry and spectra of X-ray sources in the Lockman field', Astronomy and Astrophysics, vol. 329, no. 2, pp. 495-503.

The ROSAT deep survey : II. Optical identification, photometry and spectra of X-ray sources in the Lockman field. / Schmidt, M.; Hasinger, G.; Gunn, J.; Schneider, Donald P.; Burg, R.; Giacconi, R.; Lehmann, I.; MacKenty, J.; Trümper, J.; Zamorani, G.

In: Astronomy and Astrophysics, Vol. 329, No. 2, 20.01.1998, p. 495-503.

Research output: Contribution to journalReview article

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T2 - II. Optical identification, photometry and spectra of X-ray sources in the Lockman field

AU - Schmidt, M.

AU - Hasinger, G.

AU - Gunn, J.

AU - Schneider, Donald P.

AU - Burg, R.

AU - Giacconi, R.

AU - Lehmann, I.

AU - MacKenty, J.

AU - Trümper, J.

AU - Zamorani, G.

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