Continuum and semiforbidden C III microlensing in Q2237 + 0305 and the quasar geometry

Details Continuum and semiforbidden C III microlensing in Q2237 + 0305 and the quasar geometry Continuum and semiforbidden C III microlensing in Q2237 + 0305 and the quasar geometry

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l..65r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 2, Aug. 20, 1992, p. L65-L67. Research supported by NSER

Astronomy and Astrophysics

Astrophysics

40

Gravitational Lenses, Quasars, Astronomical Photometry, Charge Coupled Devices, Galactic Structure, Light Curve, Signal To Noise Ratios

Scientific paper

New photometry of Q2237 + 0305 in V semiforbidden C III light obtained with HRCam at the CFHT on 1991 October 10 is combined with earlier data to show that, at that epoch, component B was amplified by 0.5 mag in the continuum, with a concurrent change of its (V - semiforbidden C III) color, and that component A had undergone a U-shape amplification event in 1988 - 1989. The light curves and color change indicate that, for an assumed transverse velocity of 600 km/s, the continuum region of the quasar is less than 1 x 10 exp 15 cm in radius and that the broad-line region is probably greater than 10 times larger. In the absence of microlensing and differential extinction, all four bright images of Q2237 + 0305 would have the same brightness to within less than 10 percent. The signal-to-noise ratio of the semiforbidden C III image proved insufficient to detect a faint, central fifth image of the quasar which must then be greater than 4 mag fainter than the brighter components of the mirage.

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