The ROSAT deep survey: II. Optical identification, photometry and spectra of X-ray sources in the Lockman field

M. Schmidt; G. Hasinger; J. Gunn; D. Schneider; R. Burg; R. Giacconi; I. Lehmann; J. MacKenty; J. Trümper; G. Zamorani

The ROSAT deep survey: II. Optical identification, photometry and spectra of X-ray sources in the Lockman field

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

Research output: Contribution to journal › Review article › peer-review

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 language	English (US)
Pages (from-to)	495-503
Number of pages	9
Journal	Astronomy and Astrophysics
Volume	329
Issue number	2
State	Published - Jan 20 1998

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Cite this

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title = "The ROSAT deep survey: II. Optical identification, photometry and spectra of X-ray sources in the Lockman field",

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.",

author = "M. Schmidt and G. Hasinger and J. Gunn and D. Schneider and R. Burg and R. Giacconi and I. Lehmann and J. MacKenty and J. Tr{\"u}mper and G. Zamorani",

year = "1998",

month = jan,

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language = "English (US)",

volume = "329",

pages = "495--503",

journal = "Astronomy and Astrophysics",

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TY - JOUR

T1 - The ROSAT deep survey

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, D.

AU - Burg, R.

AU - Giacconi, R.

AU - Lehmann, I.

AU - MacKenty, J.

AU - Trümper, J.

AU - Zamorani, G.

PY - 1998/1/20

Y1 - 1998/1/20

N2 - 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.

AB - 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.

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M3 - Review article

AN - SCOPUS:3142632210

SN - 0004-6361

VL - 329

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JO - Astronomy and Astrophysics

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IS - 2

ER -

The ROSAT deep survey: II. Optical identification, photometry and spectra of X-ray sources in the Lockman field

Abstract

All Science Journal Classification (ASJC) codes

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