Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398l..21y&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 398, no. 1, p. L21-L24.
Astronomy and Astrophysics
Astrophysics
12
Carbon, Gravitational Lenses, Lyman Alpha Radiation, Quasars, Active Galactic Nuclei, Emission Spectra, Spectral Line Width
Scientific paper
Narrow-band (Lyman-alpha and C IV) and broad-band imaging of the gravitational lens system 2237 + 030 has revealed a strong microlensing event in component B in 1991 with an amplitude of about 0.5 mag. The images in the emission-line bands show considerably less magnification than those in the continuum bands. This difference in magnification between the emission-line and continuum regions strongly suggests that the variation is due to microlensing, assuming a standard model for quasars in which the emission-line region is much larger than the continuum source. These observations provide a direct estimate of the size ratio of the two regions. The observed features are consistent with a model in which a resolved star-forming region in the quasar host galaxy or associated companion galaxy is lensed by the foreground galaxy.
de Robertis Michael M.
Yee Howard K. C.
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