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1999•Unpublished venueRequires access

Properties of new X-ray selected AGN

K. Bischoff, W. Pietsch, Thomas Böller, S. Döbereiner, W. Kollatschny, H. U. Zimmermann

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Abstract

Abstract. We present the results of a program to identify so far unknown active nuclei (AGN) in galaxies. Candidate galactic nuclei have been selected for optical spectroscopy from a cross-correlation of the ROSAT all sky survey (RASS) bright source catalog with optical galaxy catalogs. A high X-ray flux has been used as pointer to galaxies with a high probability to contain active nuclei. Only galaxies have been accepted for the program for which no activity was noted in NED. For many of the galaxies no radial velocity has been reported before. The optical spectra obtained in our first two runs demonstrate that the galaxies cover a redshift range of 0.014 to 0.13 and that most of them host active nuclei. For 50 % to 75 % of the candidates the X-ray emission is caused by the AGN. In addition several of the remaining candidates

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Abstract. We present the results of a program to identify so far unknown active nuclei (AGN) in galaxies. Candidate galactic nuclei have been selected for optical spectroscopy from a cross-correlation of the ROSAT all sky survey (RASS) bright source catalog with optical galaxy catalogs. A high X-ray flux has been used as pointer to galaxies with a high probability to contain active nuclei. Only galaxies have been accepted for the program for which no activity was noted in NED. For many of the galaxies no radial velocity has been reported before. The optical spectra obtained in our first two runs demonstrate that the galaxies cover a redshift range of 0.014 to 0.13 and that most of them host active nuclei. For 50 % to 75 % of the candidates the X-ray emission is caused by the AGN. In addition several of the remaining candidates

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Available abstract

Abstract. We present the results of a program to identify so far unknown active nuclei (AGN) in galaxies. Candidate galactic nuclei have been selected for optical spectroscopy from a cross-correlation of the ROSAT all sky survey (RASS) bright source catalog with optical galaxy catalogs. A high X-ray flux has been used as pointer to galaxies with a high probability to contain active nuclei. Only galaxies have been accepted for the program for which no activity was noted in NED. For many of the galaxies no radial velocity has been reported before. The optical spectra obtained in our first two runs demonstrate that the galaxies cover a redshift range of 0.014 to 0.13 and that most of them host active nuclei. For 50 % to 75 % of the candidates the X-ray emission is caused by the AGN. In addition several of the remaining candidates

Key concepts: ROSAT, Active galactic nucleus, Galaxy, Astrophysics, Sky, Physics, Astronomy, Spectroscopy

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