A search for quasars in the Virgo cluster region

Details A search for quasars in the Virgo cluster region A search for quasars in the Virgo cluster region

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..443h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Nov. 15, 1984, p. 443-459.

Astronomy and Astrophysics

Astronomy

32

Astronomical Spectroscopy, Quasars, Radio Astronomy, Virgo Galactic Cluster, Absorption Spectra, Emission Spectra, Line Spectra, Red Shift, Spatial Distribution, Spectral Line Width

Scientific paper

Using objective-prism plates taken with the 44-arcmin objective prism mounted on the UK Schmidt telescope, 53 emission-line quasar candidates and 29 ultraviolet-excess objects (possible low-redshift quasars) have been found in a 5 x 5-degree field centered on 12 h 27 m, + 13 deg 30 min (1950) in the Virgo cluster of galaxies. Eighteen of these 82 candidates were observed using the double spectrograph on the Palomar 5-meter telescope; 13 of the observed objects proved to be quasars. The broad-absorption-line QSO Q1232 + 134 is the first example of the class to show broad low-ionization absorption lines (such as Mg II 2798 A) in addition to the usual high-excitation lines such as Nv 1240 A. Although no conclusive evidence for quasar-galaxy associations is found in this field, there do exist nonuniformities in the distribution of the quasar candidates which may merit further investigation. These objects will provide a useful network of probes for absorbing material in the Virgo cluster. The lines-of-sight to two of the confirmed quasars pass very close to NGC galaxies; the respective projected QSO-galaxy separations are only 4 and 11 kpc at the assumed distance of the Virgo cluster.

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