New H2O masers in Seyfert and FIR bright galaxies

Abstract

Extragalactic water vapor masers with 50, 1000, 1, and 230 solar (isotropic) luminosities were detected toward Mrk1066 (UGC2456), Mrk34, NGC3556 and Arp299, respectively. The interacting system Arp299 appears to show two maser hotspots separated by 20 arcsec. A statistical analysis of 53 extragalactic H2O sources indicates (1) that the correlation between IRAS Point Source and H2O luminosities, established for individual star forming regions in the galactic disk, also holds for AGN dominated megamaser galaxies, (2) that maser luminosities are not correlated with 60/100 micron color temperatures and (3) that only a small fraction of the luminous megamasers detectable with 100-m sized telescopes have so far been identified. The slope of the H2O luminosity function, -1.5, indicates that the number of detectable masers is almost independent of their luminosity. If the LF is not steepening at very high maser luminosities, H2O megamasers at significant redshifts should be detectable with present day state-of-the-art facilities.

16 pages, 10 postscript figures; style file: aa.cls. Accepted for publication in the Main Journal of Astronomy & Astrophysics

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