The appearance of a new redshift system in Markarian 231

Details The appearance of a new redshift system in Markarian 231 The appearance of a new redshift system in Markarian 231

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370l..19b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 370, March 20, 1991, p. L19-L21.

Other

36

Active Galactic Nuclei, Markarian Galaxies, Red Shift, Absorption Spectra, Astronomical Spectroscopy

Scientific paper

Spectroscopic observations made in 1988 of Markarian 231 show that a new absorption redshift system has appeared. This system is seen in the Na I D lines and the He I 3889 line. Its redshift is 4660 km/s, which is 8240 km/s less than the systemic velocity. These lines were not present in any published spectra obtained through December 1984. This is an extremely dramatic case of variation in the spectrum of a broad absorption line AGN. Unlike other cases of variation which have been interpreted as due to changes in ionization of the absorbing cloud, the new system is more readily explained as the motion of a cloud with some transverse velocity into the line of sight.

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