Statistics – Computation
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157..383n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 2, March 1986, p. 383-386.
Statistics
Computation
44
Bl Lacertae Objects, Computational Astrophysics, Gravitational Lenses, Quasars, Light Curve, Red Shift, Spiral Galaxies, Visible Spectrum
Scientific paper
The eruptive BL Lac object 0846+51W1 was observed by Arp et al. (1979) to vary by 4 mag in less than a month and to have its optical spectrum turning to that of a QSO of redshift 1.86 when faintest. Moreover, it lies only 12arcsec south of a spiral galaxy of redshift 0.072. The author shows in this paper that most of the observed characteristics of 0846+51W1 may be explained by the effects of gravitational lensing by a compact object lying in the intervening galaxy, passing in front of the QSO. After having developed the theory of extended source amplification, the author shows that a fit of the light curve based on this model is consistent with a lensing object of mass ≡10-2M_sun; acting on a QSO with core dimension ≡2×10-4pc for the central region emitting the continuum.
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