Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259..546r&link_type=abstract
Nature, vol. 259, Feb. 19, 1976, p. 546, 547. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astronomy
59
Light Curve, X Ray Astronomy, X Ray Sources, Ariel Satellites, Elliptical Galaxies, Extragalactic Radio Sources, Light Sources, Milky Way Galaxy, Radio Sources (Astronomy)
Scientific paper
This letter reports the discovery by Ariel V of a high-latitude transient X-ray source in Ursa Major, located 65 deg from the galactic plane. The X-ray light curve of this source, designated A1103+38, is presented along with its error box, and possible optical counterparts are considered. The most likely optical candidate is shown to be the radio source B2 1101+38, which has been identified with the faint elliptical galaxy MK 421. It is noted that MK 421 is distinguished by an unusually bright optically variable nucleus and might be a BL Lacertae-type object, although its rapid variability has an amplitude greater than that of all other BL Lac-type objects.
Cooke Brin A.
Pounds Kenneth A.
Ricketts M. J.
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