The nuclear X-ray source in M81

Details The nuclear X-ray source in M81 The nuclear X-ray source in M81

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257l..51e&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 257, June 15, 1982, p. L51-L55.

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57

Galactic Nuclei, Luminosity, Seyfert Galaxies, X Ray Sources, High Resolution, Point Sources, Proportional Counters

Scientific paper

X-ray observations of the M81 galaxy were taken by the high resolution imager and the monitor proportional counter aboard the Einstein observatory. The luminosity is about 1.7 X 10 to the 40th ergs/s. It is suggested that M81 probably has an active nucleus two orders of magnitude less luminous than any other well-established case. Any critical 'turn-on' luminosity is thus very low and approaches that of compact X-ray binary systems. The agreement of the alpha hydrogen/X-ray ratio of M81 suggests that the physics of the activity is not strongly different at these low luminosities from that in the normal range

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