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Title:
Extremely Luminous Water Vapor Emission from a Type 2 Quasar at Redshift z = 0.66
Authors:
Barvainis, Richard; Antonucci, Robert
Affiliation:
AA(National Science Foundation, 4301 Wilson Boulevard, Arlington, VA 22230; and Department of Physics, Gettysburg College, 300 North Washington Street, Gettysburg, PA 17325; ), AB(Department of Physics, University of California at Santa Barbara, Broida Hall, Building 572, Santa Barbara, CA 93106-9530 )
Publication:
The Astrophysical Journal, Volume 628, Issue 2, pp. L89-L91. (ApJL Homepage)
Publication Date:
08/2005
Origin:
UCP
ApJ Keywords:
Masers, Galaxies: Quasars: General, Radio Lines: Galaxies
DOI:
10.1086/432666
Bibliographic Code:
2005ApJ...628L..89B

Abstract

A search for water masers in 47 Sloan Digital Sky Survey type 2 quasars using the Green Bank Telescope has yielded a detection at a redshift of z=0.660. This maser is more than an order of magnitude higher in redshift than any previously known and, with a total isotropic luminosity of 23,000 Lsolar, also the most powerful. The presence and detectability of water masers in quasars at z~0.3-0.8 may provide a better understanding of quasar molecular tori and disks, as well as fundamental quasar and galaxy properties such as black hole masses. Water masers at cosmologically interesting distances may also eventually provide, via direct distance determinations, a new cosmological observable for testing the reality and properties of dark energy, currently inferred primarily through Type 1a supernova measurements.
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