Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1989i&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 1989-1994.
Astronomy and Astrophysics
Astronomy
235
Astronomical Photometry, Gravitational Lenses, Quasars, Brightness Distribution, Charge Coupled Devices, Red Shift
Scientific paper
New photometric data are presented for the gravitationally lensed quasar system 2237 + 0305, which shows unambiguous evidence for a change in brightness of one of the four component images. This represents the first detection of a microlensing event. For the case where the source intersects the critical curve of the microlens, observational constraints on the timescale for the event allows a limit of 0.1 solar mass or less to be placed on the mass on the lensing object. The data illustrate the immense potential for obtaining information on the size of the quasar-continuum-emitting region, together with the mass function of compact objects in the lensing galaxy, through a comprehensive photometric monitoring program of the 2237 + 0305 system.
Corrigan R. T.
Hewett Paul C.
Irwin Mary Jane
Jedrzejewski Robert I.
Webster Rachel L.
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