J/ApJ/725/1792 Pi Ghz Sky Survey (PiGSS). I. (Bower+, 2010)
The Allen Telescope Array Pi GHz Sky Survey.
I. Survey description and static catalog results for the Bootes field.
Bower G.C., Croft S., Keating G., Whysong D., Ackermann R., Atkinson S.,
Backer D., Backus P., Barott B., 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 R.J., Gutierrez-Kraybill C.,
Harp G.R., Heiles C., Helfer T., Hull C., Jordan J., Jorgensen S.,
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.,
Weinreb S., Welch J., Werthimer D., Williams P.K.G., Wright M.
<Astrophys. J., 725, 1792-1804 (2010)>
=2010ApJ...725.1792B 2010ApJ...725.1792B
ADC_Keywords: Radio continuum ; Surveys
Keywords: radio continuum: galaxies - radio continuum: general -
radio continuum: stars - surveys
Abstract:
The Pi GHz Sky Survey (PiGSS) is a key project of the Allen Telescope
Array. PiGSS is a 3.1GHz survey of radio continuum emission in the
extragalactic sky with an emphasis on synoptic observations that
measure the static and time-variable properties of the sky. During the
2.5 year campaign, PiGSS will twice observe ∼250000 radio sources in
the 10000deg2 region of the sky with b>30° to an rms sensitivity
of ∼1mJy. Additionally, sub-regions of the sky will be observed
multiple times to characterize variability on timescales of days to
years. We present here observations of a 10deg2 region in the Bootes
constellation overlapping the NOAO Deep Wide Field Survey field. The
PiGSS image was constructed from 75 daily observations distributed
over a 4 month period and has an rms flux density between 200 and
250uJy. This represents a deeper image by a factor of 4-8 than we will
achieve over the entire 10000deg2. We provide flux densities, source
sizes, and spectral indices for the 425 sources detected in the image.
We identify ∼100 new flat-spectrum radio sources; we project that when
completed PiGSS will identify 104 flat-spectrum sources. We identify
one source that is a possible transient radio source. This survey
provides new limits on faint radio transients and variables with
characteristic durations of months.
Description:
The Pi GHz Sky Survey (PiGSS) observing began with the radio telescope
ATA (Allen Telescope Array) in 2009 May. We report here on
observations between 2009 May 20 and 2009 September 27. A total of 96
observations of the Bootes field were obtained, of which 75 were
included in the final result.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 90 425 PiGSS sources
table4.dat 68 390 Radio matches to PiGSS sources
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See also:
VIII/87 : The Allen Telescope Array 20cm Survey (ATATS). I. (Croft+ 2010)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
VIII/72 : CLASS survey of radio sources (Myers+, 2003)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/40 : GB6 catalog of radio sources (Gregory+ 1996)
J/A+A/535/A38 : Observations of NOAO Bootes field at 153MHz (Intema+, 2011)
J/MNRAS/404/1005 : Deep 15GHz survey (9C continued) (Waldram+, 2010)
J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)
J/AJ/130/923 : Faint radio sources in the NOAO Bootes field (Wrobel+, 2005)
J/AJ/123/1784 : 1.4 GHz imaging of the Bootes field (de Vries+, 2002)
J/A+AS/131/303 : GHz-Peaked-Spectrum radio sources (Stanghellini+ 1998)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- PiGSS Source name (JHHMMSS+DDMMSS)
16- 23 F8.5 h RAhour Right Ascension in decimal hours (J2000)
25- 32 F8.5 deg DEdeg Declination in decimal degrees (J2000)
34- 37 F4.1 arcsec e_RAhour Error in Right Ascension
39- 42 F4.1 arcsec e_DEdeg Error in Declination
44- 48 F5.1 arcsec amaj Measured Gaussian semi-major axis
50- 54 F5.1 arcsec bmin Measured Gaussian semi-minor axis
56- 60 F5.1 deg phi Measured position angle φ
62- 66 F5.1 arcsec amaj' Deconvolved Gaussian semi-major axis
68- 72 F5.1 arcsec bmin' Deconvolved Gaussian semi-minor axis
74- 78 F5.1 deg phi' Deconvolved position angle φ'
80- 85 F6.2 mJy Flux The 3.1GHz flux density
87- 90 F4.2 mJy e_Flux Error in Flux
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- PiGSS Source name (JHHMMSS+DDMMSS)
16- 21 F6.2 mJy S1400 ?=0 Flux density at 1400MHz from de Vries et al.
2002, Cat. J/AJ/123/1784
23- 27 F5.2 --- a1400 ?=0 Spectral index at 1400MHz
29- 32 F4.2 --- e_a1400 ?=0 Error in a1400
34- 39 F6.2 mJy SNVSS ?=0 NVSS catalog 1.4GHz flux density (Cat. VIII/65)
41- 45 F5.2 --- aNVSS ?=0 NVSS Spectral index
47- 50 F4.2 --- e_aNVSS ?=0 Error in aNVSS
52- 57 F6.2 mJy S4850 ?=0 Flux density at 4850MHz from GB6 (Gregory et
al., 1996, Cat. VIII/40)
59- 63 F5.2 --- a4850 ?=0 Spectral index at 4850MHz
65- 68 F4.2 --- e_a4850 ?=0 Error in a4850
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Aug-2012