Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243...42m&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 42-46.
Astronomy and Astrophysics
Astronomy
37
Bl Lacertae Objects, X Ray Sources, X Ray Spectra, Black Holes (Astronomy), Galactic Clusters, Magnitude, Proportional Counters, Radio Sources (Astronomy), Red Shift, X Ray Telescopes
Scientific paper
Six fields containing BL Lacertae objects are observed with the Imaging Proportional Counter (IPC) of the Einstein Observatory. Five out of six BL Lacertae objects (3C 66 A, PKS 0548-322, 1400 + 162, 4C 14.60, and OY 091) are found to be soft X-ray sources. The object 3C 66 A is observed to vary by 25% on a time scale of approximately 53 hours. Eight other X-ray sources are detected in these fields, one of which is extended.
Maccagni Dario
Tarenghi Marco
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