Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.337..627m&link_type=abstract
Nature (ISSN 0028-0836), vol. 337, Feb. 16, 1989, p. 627-629. Research supported by Georgia State University.
Astronomy and Astrophysics
Astronomy
118
Astronomical Photometry, Bl Lacertae Objects, Black Holes (Astronomy), Brightness Distribution, Charge Coupled Devices, Light Curve, Luminosity, Relativistic Electron Beams, Stellar Magnitude
Scientific paper
Observations of BL Lacertae are reported in which rapid changes were detected in the total optical flux from the object. These variations occurred on timescales as short as 1.5 hours. Although their structure is complex, the minimum timescale for the variations may be used to place constraints on the size of the emitting region. Assuming that these variations are produced in the vicinity of a supermassive black hole, the timescales imply a black hole mass of 1.42 x 10 to the 9th solar masses. Reltivistic beaming need not be invoked to account for the present luminosity of this object.
Carini Michael T.
Goodrich Bret D.
Miller Richard H.
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