The Circinus galaxy - A second case of intense nuclear H2O emission

Details The Circinus galaxy - A second case of intense nuclear H2O emission The Circinus galaxy - A second case of intense nuclear H2O emission

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201p..13g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 13P-15P.

Astronomy and Astrophysics

Astronomy

66

Astronomical Spectroscopy, Emission Spectra, Galactic Nuclei, Spiral Galaxies, Water Masers, Atmospheric Attenuation, Broadband, Radiant Flux Density, Radio Astronomy, Spectral Resolution

Scientific paper

H2O maser emission has been detected in the Circinus galaxy from within 10-15 arcsec of its nucleus. It consists of several faint broad bands between the heliocentric velocities of 500 and 630 km/sec, on which are superimposed several narrow (approximately 1 km/sec) features with peak intensities as high as 12 Jy. The three brightest narrow-band features have a symmetry in velocity differences which suggests the presence of maser emission from a narrow shell expanding at a velocity of 27.5 km/sec. For a distance of 4 Mpc, the luminosity is 37 solar luminosities. This galaxy is the second found to have nuclear H2O emission with a luminosity at least an order of magnitude greater than any known H2O source in the Galaxy.

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