Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...224l..27s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 224, no. 1-2, Oct. 1989, p. L27-L30.
Astronomy and Astrophysics
Astrophysics
16
Bl Lacertae Objects, Faint Objects, Gravitational Lenses, Red Shift, Astronomical Photometry, Elliptical Galaxies, Image Analysis, Spectrum Analysis, Visible Spectrum
Scientific paper
On deep direct images taken during a faint state, the high redshift BL Lac object 0846 + 51W1 shows an elongated appearance which is due to an intervening galaxy located nearly exactly on the line of sight. The optical emission of this galaxy is also present in the spectrum of 0846 + 51W1 and causes the apparently steep optical spectral index during the low quasar-like state of this object. Modeling the observed spectrum of 0846 + 51W1 with a quasar power law of spectral index alpha = 1.1 and the energy distribution of an elliptical galaxy yields a redshift of z = 0.235 for the intervening galaxy. These observations strongly support the hypothesis that the observed properties of 0846 + 51W1 are markedly influenced by gravitational (micro)lensing.
Fried Josef W.
Kuehr Helmut
Stickel Manfred
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