X-ray emission from BL-Lacertae objects. II - The nature of Markarian 421

Abstract

view Abstract Citations (30) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-ray emission from BL-Lacertae objects. II. The nature of Markarian 421. Margon, B. ; Jones, T. W. ; Wardle, J. F. C. 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 full text sources ADS | data products NED (2) SIMBAD (1)