1309-216 - A probable BL Lacertae object with absorption redshift 1.49

Details 1309-216 - A probable BL Lacertae object with absorption redshift 1.49 1309-216 - A probable BL Lacertae object with absorption redshift 1.49

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191...61b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 191, Apr. 1980, p. 61-68. Research supported by the Australian Research

Astronomy and Astrophysics

Astronomy

14

Absorption Spectra, Astronomical Spectroscopy, Bl Lacertae Objects, Radio Sources (Astronomy), Red Shift, Ionized Gases, Nonthermal Radiation, Silicon, Spectral Line Width

Scientific paper

The optical spectrum of the radio source 1309-216 is shown to consist of a nonthermal continuum with no emission features but with strong C IV absorption at redshifts 1.361, 1.489 and 1.491. In the strongest absorption system (absorption redshift equal to 1.489) Si II and Si IV are also detected. There is some evidence for optical variability and the most plausible classification is as a BL Lac object. The absorption lines have intrinsic FWHM ranging from 150 to 325 km/sec. This absorption could arise either in material ejected from a central source or in highly ionized gas in the haloes of intervening galaxies, but not in material typical of interstellar H I clouds.

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