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Title:
An Expanded Very Large Array Search for Water Megamaser Emission in the Submm Galaxy SMM J16359+6612 at z = 2.5
Authors:
Edmonds, R.; Wagg, J.; Momjian, E.; Carilli, C. L.; Wilner, D. J.; Humphreys, E. M. L.; Menten, K. M.; Hughes, D. H.
Affiliation:
AA(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA ), AB(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA ), AC(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA ), AD(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA ), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA ), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA ), AG(Max-Planck Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany ), AH(Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Aptdo. Postal 51 y 216, Puebla, Mexico)
Publication:
The Astronomical Journal, Volume 137, Issue 2, pp. 3293-3296 (2009). (AJ Homepage)
Publication Date:
02/2009
Origin:
IOP
AJ Keywords:
cosmology: observations, galaxies: starburst, gravitational lensing, masers
DOI:
10.1088/0004-6256/137/2/3293
Bibliographic Code:
2009AJ....137.3293E

Abstract

Using the Expanded Very Large Array, we have conducted a search for 22.2 GHz H2O megamaser emission in the strongly lensed submm galaxy, SMM J16359+6612 at z = 2.517. This object is lensed into three components, and after a correction for magnification is applied to its submm-wavelength flux density, it is typical of the bulk of the high-redshift, submm galaxy population responsible for the 850 μm extragalactic background (S 850 μm~ 1 mJy). We do not detect any H2O megamaser emission, but the lensing allows us to place an interesting constraint on the luminosity of any megamasers present, L_H_2 O 5305 L sun for an assumed linewidth of 80 km s-1. Because the far-infrared luminosity in submm galaxies is mainly powered by star formation, and very luminous H2O megamasers are more commonly associated with quasar activity, it could be that blind searches for H2O megamasers will not be an effective means of determining redshifts for less-luminous members of the submm galaxy population.
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