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VIII/87 The Allen Telescope Array 20cm Survey (ATATS). I. (Croft+ 2010)
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Beginning of ReadMe :VIII/87 The Allen Telescope Array 20cm Survey (ATATS). I. (Croft+ 2010)
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The Allen Telescope Array Twenty-centimeter Survey - A 690-square-degree,
12-epoch radio dataset
I. Catalog and long-duration transient statistics
Croft S., Bower G.C., Ackermann R., Atkinson S., Backer D., Backus P.,
Barott W.C., Bauermeister A., Blitz L., Bock D., Bradford T., Cheng C.,
Cork C., Davis M., De Boer D., Dexter M., Dreher J., Engargiola G.,
Fields E., Fleming M., Forster J.R., Gutierrez-Kraybill C., Harp G.,
Helfer T., Hull C., Jordan J., Jorgensen S., Keating G., Kilsdonk T.,
Law C., Van Leeuwen J., Lugten J., MacMahon D., McMahon P., Milgrome O.,
Pierson T., Randall K., Ross J., Shostak S., Siemion A., Smolek K.,
Tarter J., Thornton D., Urry L., Vitouchkine A., Wadefalk N., Welch J.,
Werthimer D., Whysong D., Williams P.K.G., Wright M.
<Astrophys. J., 719, 45-58 (2010)>
=2010ApJ...719...45C
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ADC_Keywords: Radio continuum ; Radio sources ; Surveys
Keywords: catalogs - radio continuum: galaxies - surveys
Abstract:
We present the Allen Telescope Array Twenty-centimeter Survey (ATATS),
a multi-epoch (12 visits), 690deg^2^ radio image and catalog at
1.4GHz. The survey is designed to detect rare, very bright transients
as well as to verify the capabilities of the ATA to form large
mosaics. The combined image using data from all 12 ATATS epochs has
rms noise sigma=3.94mJy/beam and dynamic range 180, with a circular
beam of 150" FWHM. It contains 4408 sources to a limiting sensitivity
of 5sigma=20mJy/beam. We compare the catalog generated from this 12
epoch combined image to the NRAO VLA Sky Survey (NVSS), a legacy
survey at the same frequency, and find that we can measure source
positions to better than 20". For sources above the ATATS
completeness limit, the median flux density is 97% of the median value
for matched NVSS sources, indicative of an accurate overall flux
calibration. We examine the effects of source confusion due to the
effects of differing resolution between ATATS and NVSS on our ability
to compare flux densities. We detect no transients at flux densities
greater than 40mJy in comparison with NVSS and place a 2sigma upper
limit of 0.004deg^-2^ on the transient rate for such sources. These
results suggest that the > 1Jy transients reported by Matsumara et al.
may not be true transients, but rather variable sources at their flux
density threshold.
Description:
In this paper, we present the ATA Twenty-centimeter Survey (ATATS),
which consists of observations of 690deg^2^ of sky centered on the
10deg^2^ Bootes deep field. ATATS observations were spread over 12
epochs from 2009 January 12 to April 3. This paper examines the image
and catalog made with data from all 12 epochs and compares it to the
NRAO VLA Sky Survey (NVSS; Condon et al. 1998, Cat. VIII/65).