Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354..116m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 1, 1990, p. 116-123.
Astronomy and Astrophysics
Astronomy
13
Bl Lacertae Objects, Galactic Evolution, Markarian Galaxies, Radio Jets (Astronomy), Astronomical Spectroscopy, Emission Spectra, Relativistic Effects, Synchrotron Radiation, Ultraviolet Spectra
Scientific paper
Coordinated observations of the nearby BL Lacertae object Mrk 421 obtained during May 1980, January 1984 and March 1984, are described. These observations give a time-frozen picture of the continuous spectrum of Mrk 421 at X-ray, ultraviolet, optical, and radio wavelengths. The observed spectra have been fitted to an inhomogeneous relativistic jet model described by Hutter and Mufson. The studies show that it is difficult to describe the data by a single jet whose properties vary as a function of time in a self-consistent manner unless the flat spectrum, hard X-ray tail present in January 1984 is due to an additional short-lived component of emission. These jet models are compared with homogeneous, spherically symmetric, synchrotron self-Compton models for this source.
Hutter Donald J.
Kondo Yoshihiko
Mufson Stuart Lee
Urry Claudia Megan
Wisniewski Weislaw Z.
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