Dwarf and giant extragalactic megamasers - IRAS 1224-0036 and IRAS 1201+1941

Details Dwarf and giant extragalactic megamasers - IRAS 1224-0036 and IRAS 1201+1941 Dwarf and giant extragalactic megamasers - IRAS 1224-0036 and IRAS 1201+1941

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201l..13m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 1, July 1988, p. L13-L15.

Astronomy and Astrophysics

Astronomy

27

Dwarf Galaxies, Hydroxyl Emission, Infrared Radiation, Interstellar Masers, Spiral Galaxies, Infrared Astronomy Satellite, Line Spectra, Luminosity, Red Shift

Scientific paper

New OH detection are presented for two infrared galaxies IRAS 1224-0036 (= NGC 4418) and IRAS 1201+1941, respectively the nearest (d = 29 Mpc) and the farthest (d = 620 Mpc) megamaser galaxies known. It appears that the megamaser phenomenon takes place in IRAS galaxies ranging from "dwarf" megamaser characterized by relatively low IR and OH luminosities (LIR ≈ 1011L_sun; und LOH ≈ 1 L_sun; with prototype NGC 4418) to "giant" megamaser (LIR ≈ 3×1012L_sun; and LOH ≈ 103L_sun;). There is a good correlation between OH and IR luminosities (LOH proportional to LIR2) which holds over three orders of magnitude in LOH; thus the pumping efficiency increases systematically by about a factor of 100 when going from "dwarf" to "giant" megamasers.

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