TY - JOUR
T1 - A 325-MHz GMRT survey of the Herschel-ATLAS/GAMA fields
AU - Mauch, T.
AU - Kloeckner, H-R.
AU - Rawlings, S.
AU - Jarvis, M.J.
AU - Hardcastle, M.J.
AU - Obreschkow, D.
AU - Saikia, D.J.
AU - Thompson, M.A.
PY - 2013/10/1
Y1 - 2013/10/1
N2 - We describe a 325-MHz survey, undertaken with the Giant Metrewave Radio Telescope (GMRT), which covers a large part of the three equatorial fields at 9, 12 and 14.5 h of right ascension from the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) in the area also covered by the Galaxy AndMass Assembly (GAMA) survey. The full data set, after some observed pointings were removed during thedata reduction process, comprises 212 GMRT pointings covering ~90 deg of sky. We have imaged and catalogued the data using a pipeline that automates the process of flagging, calibration, self-calibration and source detection for each of the survey pointings. The resulting images have resolutions of between 14 and 24 arcsec and minimum rms noise (away from bright sources) of ~1 mJy beam, and the catalogue contains 5263 sources brighter than 5Σ. We investigate the spectral indices of GMRT sources which are also detected at 1.4 GHz and find them to agree broadly with previously published results; there is no evidence for any flattening of the radio spectral index below S = 10 mJy. This work addsto the large amount of available optical and infrared data in the H-ATLAS equatorial fields and will facilitate further study of the low-frequency radio properties of star formation and AGN activity in galaxies out to z ~ 1.
AB - We describe a 325-MHz survey, undertaken with the Giant Metrewave Radio Telescope (GMRT), which covers a large part of the three equatorial fields at 9, 12 and 14.5 h of right ascension from the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) in the area also covered by the Galaxy AndMass Assembly (GAMA) survey. The full data set, after some observed pointings were removed during thedata reduction process, comprises 212 GMRT pointings covering ~90 deg of sky. We have imaged and catalogued the data using a pipeline that automates the process of flagging, calibration, self-calibration and source detection for each of the survey pointings. The resulting images have resolutions of between 14 and 24 arcsec and minimum rms noise (away from bright sources) of ~1 mJy beam, and the catalogue contains 5263 sources brighter than 5Σ. We investigate the spectral indices of GMRT sources which are also detected at 1.4 GHz and find them to agree broadly with previously published results; there is no evidence for any flattening of the radio spectral index below S = 10 mJy. This work addsto the large amount of available optical and infrared data in the H-ATLAS equatorial fields and will facilitate further study of the low-frequency radio properties of star formation and AGN activity in galaxies out to z ~ 1.
U2 - 10.1093/mnras/stt1323
DO - 10.1093/mnras/stt1323
M3 - Article
AN - SCOPUS:84885133691
SN - 0035-8711
VL - 435
SP - 650
EP - 662
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -