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Title: PRECISE ABSOLUTE ASTROMETRY FROM THE VLBA IMAGING AND POLARIMETRY SURVEY AT 5 GHz

Abstract

We present accurate positions for 857 sources derived from the astrometric analysis of 16 eleven-hour experiments from the Very Long Baseline Array imaging and polarimetry survey at 5 GHz (VIPS). Among the observed sources, positions of 430 objects were not previously determined at milliarcsecond-level accuracy. For 95% of the sources the uncertainty of their positions ranges from 0.3 to 0.9 mas, with a median value of 0.5 mas. This estimate of accuracy is substantiated by the comparison of positions of 386 sources that were previously observed in astrometric programs simultaneously at 2.3/8.6 GHz. Surprisingly, the ionosphere contribution to group delay was adequately modeled with the use of the total electron content maps derived from GPS observations and only marginally affected estimates of source coordinates.

Authors:
 [1];  [2]
  1. ADNET Systems Inc./NASA GSFC, Greenbelt, MD 20771 (United States)
  2. Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131 (United States)
Publication Date:
OSTI Identifier:
21582876
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 142; Journal Issue: 3; Other Information: DOI: 10.1088/0004-6256/142/3/89; Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; ASTROPHYSICS; CATALOGS; GLOBAL POSITIONING SYSTEM; IONOSPHERE; POLARIMETRY; DOCUMENT TYPES; EARTH ATMOSPHERE; PHYSICS

Citation Formats

Petrov, L., and Taylor, G. B., E-mail: Leonid.Petrov@lpetrov.net, E-mail: gbtaylor@unm.edu. PRECISE ABSOLUTE ASTROMETRY FROM THE VLBA IMAGING AND POLARIMETRY SURVEY AT 5 GHz. United States: N. p., 2011. Web. doi:10.1088/0004-6256/142/3/89.
Petrov, L., & Taylor, G. B., E-mail: Leonid.Petrov@lpetrov.net, E-mail: gbtaylor@unm.edu. PRECISE ABSOLUTE ASTROMETRY FROM THE VLBA IMAGING AND POLARIMETRY SURVEY AT 5 GHz. United States. doi:10.1088/0004-6256/142/3/89.
Petrov, L., and Taylor, G. B., E-mail: Leonid.Petrov@lpetrov.net, E-mail: gbtaylor@unm.edu. Thu . "PRECISE ABSOLUTE ASTROMETRY FROM THE VLBA IMAGING AND POLARIMETRY SURVEY AT 5 GHz". United States. doi:10.1088/0004-6256/142/3/89.
@article{osti_21582876,
title = {PRECISE ABSOLUTE ASTROMETRY FROM THE VLBA IMAGING AND POLARIMETRY SURVEY AT 5 GHz},
author = {Petrov, L. and Taylor, G. B., E-mail: Leonid.Petrov@lpetrov.net, E-mail: gbtaylor@unm.edu},
abstractNote = {We present accurate positions for 857 sources derived from the astrometric analysis of 16 eleven-hour experiments from the Very Long Baseline Array imaging and polarimetry survey at 5 GHz (VIPS). Among the observed sources, positions of 430 objects were not previously determined at milliarcsecond-level accuracy. For 95% of the sources the uncertainty of their positions ranges from 0.3 to 0.9 mas, with a median value of 0.5 mas. This estimate of accuracy is substantiated by the comparison of positions of 386 sources that were previously observed in astrometric programs simultaneously at 2.3/8.6 GHz. Surprisingly, the ionosphere contribution to group delay was adequately modeled with the use of the total electron content maps derived from GPS observations and only marginally affected estimates of source coordinates.},
doi = {10.1088/0004-6256/142/3/89},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 3,
volume = 142,
place = {United States},
year = {2011},
month = {9}
}