Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83.1021m&link_type=abstract
Astronomical Journal, vol. 83, Sept. 1978, p. 1021-1025. NSF-supported research.
Astronomy and Astrophysics
Astronomy
28
Astronomical Photometry, Radio Galaxies, X Ray Sources, Compton Effect, Microwave Interferometers, Photographic Measurement, Radio Astronomy, Spectrophotometry, Synchrotron Radiation, Visual Photometry
Scientific paper
This paper presents optical photometry, spectrophotometry, and 3.7- and 11.1-cm radio observations of Markarian 421 (=B21101+38), a BL Lac-type object which is a candidate for identification with the highly variable X-ray source 2A1102+384 (=A1103+38). Photometry and radio observations obtained near in time to the large X-ray outburst of May 1975 show variability, but no clear correlation with the X-ray data. Image-tube scanner observations are presented which show stellar absorption features in the blue, with redshift z = 0.03, in agreement with previous photographic observations by Ulrich et al. (1975). A formalism which interprets the X-ray emission as Compton-scattered radio synchrotron radiation is used to derive parameters of the system.
Jones Thomas W.
Margon Bruce
Wardle John F. C.
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