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Title:
Variability of the Nuclear Radio Source in M31
Authors:
Crane, Patrick C.; Cowan, John J.; Dickel, John R.; Roberts, Douglas A.
Publication:
Astrophysical Journal Letters v.417, p.L61 (ApJL Homepage)
Publication Date:
11/1993
Origin:
APJ; KNUDSEN; NED
Astronomy Keywords:
GALAXIES: INDIVIDUAL MESSIER NUMBER: M31, GALAXIES: NUCLEI
DOI:
10.1086/187094
Bibliographic Code:
1993ApJ...417L..61C

Abstract

The unresolved nuclear radio source in the galaxy M31 has been detected at a second epoch, with a luminosity one-quarter that of Sgr A*. Between the two epochs of observation (1990 June 8 and 9 and 1992 November 4 and 5), the flux density at λ3.6 cm increased from 28 +/- 5 to 39 +/- 5 microJy. The value of X^2^ is consistent, at the 70% level, with variability about the mean flux density. The observed variability is similar to that of Sgr A* and strengthens the identification of the source in M31 as an analog of Sgr A*.

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