Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91...49f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, Jan. 1986, p. 49-55. Research supported by the Miller Institute for Basic Resear
Astronomy and Astrophysics
Astronomy
23
Absorption Spectra, Astronomical Spectroscopy, Bl Lacertae Objects, Continuous Spectra, Red Shift, X Ray Sources, Elliptical Galaxies, Stellar Spectra, Variability
Scientific paper
New optical spectra are used to derive the redshift of H0323+022, a bright, highly variable X-ray source whose nature has been subject of controversy. Most of the spectra are dominated by a featureless nonstellar continuum, as found in BL Lac objects. Photometric variations of ⪆2 mag have been seen over a time interval of only 2 days. The nonstellar light is sometimes faint enough to allow the detection of absorption lines at a redshift z = 0.1471±0.0005. These lines are clearly due to stars in the host galaxy, which is easily visible in deep images of the object. The galaxy is probably a relatively normal elliptical with MV ≈ -21 to -22, except that a noticeable extension is evident in one quadrant. There is now no doubt that H0323+022 is a BL Lac object, rather than a peculiar Galactic star.
Djorgovski Stanislav
Filippenko Alexei V.
Sargent Wallace L. W.
Spinrad Hyron
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