X-ray emission from BL-Lacertae objects. II. The nature of Markarian 421.
Abstract
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.
- Publication:
-
The Astronomical Journal
- Pub Date:
- September 1978
- DOI:
- 10.1086/112286
- Bibcode:
- 1978AJ.....83.1021M
- Keywords:
-
- Astronomical Photometry;
- Radio Galaxies;
- X Ray Sources;
- Compton Effect;
- Microwave Interferometers;
- Photographic Measurement;
- Radio Astronomy;
- Spectrophotometry;
- Synchrotron Radiation;
- Visual Photometry;
- Astrophysics;
- BL Lacertae Objects:Markarian Galaxies;
- BL Lacertae Objects:Radio Radiation;
- BL Lacertae Objects:X Rays