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Title: THE MEGAMASER COSMOLOGY PROJECT. VI. OBSERVATIONS OF NGC 6323

We present observations of the H{sub 2}O megamasers in the accretion disk of NGC 6323. By combining interferometric and spectral monitoring data, we estimate H{sub 0}=73{sub −22}{sup +26} km s{sup –1} Mpc{sup –1}, where the low strength of the systemic masers (<15 mJy) limits the accuracy of this estimate. The methods developed here for dealing with weak maser emission provide guidance for observations of similar sources, until significant increases in radio telescope sensitivity, such as anticipated from the next generation Very Large Array, are realized.
Authors:
;  [1] ; ; ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan (China)
  2. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
  3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  4. Department of Astronomy, University of Virginia, Charlottesville, VA 22904 (United States)
  5. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)
Publication Date:
OSTI Identifier:
22364243
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 800; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; ACCURACY; COSMOLOGY; GALAXIES; GALAXY NUCLEI; MASERS; MONITORING; PHOTON EMISSION; RADIO TELESCOPES; SENSITIVITY; WATER