GMRTHA325M ivo://nasa.heasarc/gmrtha325m NASA/GSFC HEASARC Mauch et al. 2026-10-02 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a source list from a 325-MHz survey undertaken with the Giant Metrewave Radio Telescope (GMRT). This survey 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 And Mass Assembly (GAMA) survey. The full data set, after some observed pointings were removed during the data reduction process, comprises 212 GMRT pointings covering ~90 deg<sup>2</sup> of sky. A list of the central coordinates of the images from which the sources listed in this catalog are derived is available at <a href="http://gmrt-gama.extragalactic.info/GMRT_GAMA_IMAGE_CENTERS">http://gmrt-gama.extragalactic.info/GMRT_GAMA_IMAGE_CENTERS</a>. The images themselves are available at <a href="http://gmrt-gama.extragalactic.info/">http://gmrt-gama.extragalactic.info/</a>. The authors 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 arcseconds and minimum rms noise (away from bright sources) of ~1 mJy beam<sup>-1</sup>, and the catalogue contains 5263 sources brighter than the local 5 sigma values. In the reference paper, the authors investigate the spectral indices of those 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<sub>1.4</sub> = 10 mJy. This work adds to 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. This table was created by the HEASARC in December 2013 based on electronic versions of the 3 catalogs that comprise Table 3 from the reference paper which were obtained from the MNRAS web site. Some of the values for the name parameter in the HEASARC's implementation of this table were corrected in April 2018. This is a service provided by NASA HEASARC . 2013MNRAS.435..650M https://heasarc.gsfc.nasa.gov/W3Browse/all/gmrtha325m.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=gmrtha325m& GET text/xml 180 99999 true 179.90304 -2.54942 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=gmrtha325m GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_gmrtha325m&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public gmrtha325m Giant Metrewave Radio Telescope Herschel-ATLAS/GAMA Flds 325-MHz name Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable ra_error Error in Right Ascension arcsec stat.error;pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable dec_error Error in Declination arcsec stat.error;pos.eq.dec;meta.main double nullable flux_325_mhz Fitted Peak Flux Density at 325 MHz mJy/beam phot.flux.density;em.radio.200-400MHz double nullable flux_325_mhz_error Error in Peak Flux Density at 325 MHz mJy/beam stat.error;phot.flux.density;em.radio.200-400MHz double nullable int_flux_325_mhz Integrated Flux Density at 325 MHz mJy phot.flux.density;em.radio.200-400MHz double nullable int_flux_325_mhz_error Error in Integrated Flux Density at 325 MHz mJy stat.error;phot.flux.density;em.radio.200-400MHz double nullable major_axis_error Error in Major Axis arcsec stat.error;phys.angSize.smajAxis double nullable image_name File Name of GMRT Mosaicked Image meta.id;obs.field char nullable rms_325_mhz Local RMS Noise at 325 MHz mJy/beam stat.error;phot.flux.density;em.radio.200-400MHz double nullable major_axis Major Axis FWHM of Fitted Gaussian arcsec phys.angSize.smajAxis double nullable minor_axis_error Error in Minor Axis arcsec stat.error;phys.angSize.sminAxis double nullable minor_axis Minor Axis FWHM of Fitted Gaussian arcsec phys.angSize.sminAxis double nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double nullable position_angle_error Error in Position Angle degree stat.error;pos.posAng short nullable position_angle Position Angle of Fitted Gaussian degree pos.posAng double nullable field_name Observation Field Designation meta.id;obs.field char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable