Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.2005b&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #20.05; Bulletin of the American Astronomical Society, Vol. 30, p.1280
Astronomy and Astrophysics
Astronomy
Scientific paper
Using ROSAT X-ray identifications it has been found that four compact X-ray sources in the ROSAT field centered on the bright Seyfert galaxy NGC 1068 are identified with QSOs that have redshifts 0.261, 0.385, 0.655 (Lick data) and 1.112. From an extensive optical survey published in 1995 by S. Cristiani et al., which includes this region around NGC 1068, it is shown that seven more QSOs, with redshifts 0.468 < z < 2.018, lie in the same field, i.e. there are eleven QSOs with V < 19 lying within ~ 2 sq. deg. around NGC 1068. The QSOs are distributed asymmetrically about the galaxy: five of them, including two of the ROSAT sources, lie in a field 25' x 10' around NGC 1068, making an areal density of 70 QSOs sq. deg.(-1) , while the average areal density of QSOs brighter than V = 19 obtained from several surveys is only 3 sq. deg.(-1) . It is concluded that the QSOs are physically associated with NGC 1068, and were probably ejected from it.
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