Multifrequency observations of the BL Lacertae object PKS 0537 - 441

Journal Article · Mon Jul 01 00:00:00 EDT 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163328· OSTI ID:5798145

Maraschi, L; Treves, A; Schwartz, D A; Tanzi, E G

PKS 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. 28 references.

• Research Organization: Milano Universita, Italy; CNR, Istituto di Fisica Cosmica, Milan, Italy; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA
• OSTI ID: 5798145
• Journal Information: Astrophys. J.; (United States), Vol. 294
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BL LACERTAE OBJECTS
ULTRAVIOLET RADIATION
X RADIATION
COMPARATIVE EVALUATIONS
FAR INFRARED RADIATION
PHOTOMETRY
RELATIVISTIC RANGE
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ENERGY RANGE
INFRARED RADIATION
IONIZING RADIATIONS
RADIATIONS
640103* - Astrophysics & Cosmology- Quasi-Stellar
Radio
& X-Ray Sources- (-1987)