H 2O Maser Emission from the Nuclei of NGC 253 and M51

Details H 2O Maser Emission from the Nuclei of NGC 253 and M51 H 2O Maser Emission from the Nuclei of NGC 253 and M51

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..663h&link_type=abstract

Astrophysical Journal v.320, p.663

Astronomy and Astrophysics

Astronomy

44

Galaxies: Individual Ngc Number: Ngc 253, Galaxies: Individual Messier Number: M51, Galaxies: Nuclei, Masers

Scientific paper

New H2O masers were detected in the nuclear region of NGC 253 and M51. Although these galaxies are believed to have "active" nuclei from optical, infrared, and radio data, the observed luminosities in the H2O line, if isotropically radiated, are not unusually large, ˜0.1-1 Lsun. Such luminosities are comparable to those of the brightest H2O masers in our own Galaxy. These detections suggest that "normal" H2O masers are present in nuclei with strong star-formation activity. The very luminous H2O masers (10-500 Lsun) reported for a few external galaxies, heretofore thought to represent a separate class of masers with excitation conditions related to nuclear activity, may simply be the most luminous members of a normal, but large, population of masers associated with nuclear star formation.

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