Detection of an unresolved nuclear radio source in M31

Details Detection of an unresolved nuclear radio source in M31 Detection of an unresolved nuclear radio source in M31

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390l...9c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. L9-L12.

Astronomy and Astrophysics

Astronomy

53

Andromeda Galaxy, Galactic Nuclei, Radio Sources (Astronomy), Supernova Remnants, Supernovae, Synchrotron Radiation, X Ray Sources

Scientific paper

An unresolved radio source with a flux density of 28 +/- 5 microJy is detected at the center of the galaxy M31. This source coincides with the optical stellar nucleus and with a variable Einstein X-ray source but is only 1/30 as luminous as the Galactic-center source Sgr A and one-fifth as luminous as Sgr A. Consequently, this object is the weakest known nuclear radio source. No evidence is found for radio emission from the remnant of supernova 1885A in M31. An upper limit of 15 microJy is determined for the flux density of this source, which is 1/15 the value for Tycho's SNR if it were at the same distance.

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