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Multifrequency observations of the BL Lacertae object PKS 0537 - 441PKS 0537 - 441 was repeatedly observed in the UV band with the International Ultraviolet Explorer and in the X-ray with the Einstein Observatory. On September 27, 1980, simultaneous observations in the two bands were obtained. Near-infrared photometry preceding and following the simultaneous observations by about one month is available from the literature, as is radio monitoring at 408 and 5000 MHz. Comparison of the observed X-ray flux with that predicted by the standard synchrotron self-Compton formalism, with a source dimension deduced from radio variability at 5 GHz, indicates that this component of the radio emission must be moving at relativistic speed with an effective projected Doppler beaming factor of about 10.
Document ID
19850061596
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Maraschi, L. (Milan Univ. Italy)
Treves, A. (Milano, Universita; CNR, Istituto di Fisica Cosmica, Milan, Italy)
Schwartz, D. A. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Tanzi, E. G. (CNR Istituto di Fisica Cosmica, Milan, Italy)
Date Acquired
August 12, 2013
Publication Date
July 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 294
ISSN: 0004-637X
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
Distribution Limits
Public
Copyright
Other