Discovery of soft X-ray flux from 2A 1102+384 = Markarian 421

Details Discovery of soft X-ray flux from 2A 1102+384 = Markarian 421 Discovery of soft X-ray flux from 2A 1102+384 = Markarian 421

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l..63h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 15, 1979, p. L63-L65.

Astronomy and Astrophysics

Astrophysics

26

Bl Lacertae Objects, Elliptical Galaxies, Galactic Radiation, Radiant Flux Density, X Ray Sources, Collimators, Gas Density, Variability, X Ray Spectra

Scientific paper

During April 1976 a soft X-ray flux was detected with SAS 3 from the vicinity of 2A 1102+384. The average flux densities were 4.3 x 10 to the -11th and 14 x 10 to the -11th erg/sq cm per sec in the energy bands 0.1-0.28 keV and 1-6 keV, respectively. There is an indication of variability over about 0.5 day in the lowest energy band. An upper limit of 3 x 10 to the 20th H atoms per sq cm is found for the gas column density to the X-ray source. In May 1978, observations with the modulation collimators of SAS 3 yielded an accurate (40 arcsec error radius) position for the X-ray source (2-6 keV) at right ascension 11 h 1 m 39.7 s, declination + 38 deg 28 min 51 sec (equinox 1950). The earlier tentative identification by Ricketts et al. (1976) with the BL Lacertae object B2 1101+38 = Markarian 421 is thus confirmed.

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