GMRT1HXCSF ivo://nasa.heasarc/gmrt1hxcsf NASA/GSFC HEASARC Moss et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the results of a deep 610-MHz survey of the 1<sup>hr</sup> XMM-Newton/Chandra survey area with the Giant Metre-wave Radio Telescope (GMRT). The resulting maps have a resolution of ~7 arcseconds and an rms noise limit of 60 µJy (µJy). To a 5-sigma detection limit of 300 uJy, the authors detect 223 sources within a survey area of 64 arcminutes in diameter. They compute the 610-MHz source counts and compare them to those measured at other radio wavelengths. The well-known flattening of the Eucidean-normalized 1.4-GHz source counts below ~ 2 mJy, usually explained by a population of starburst galaxies undergoing luminosity evolution, is seen at 610 MHz. In 2004 August, the 1<sup>hr</sup> field (centered at (J2000.0) RA, Dec = 01<sup>h</sup> 45<sup>m</sup> 27<sup>s</sup>, -04<sup>o</sup> 34' 42") was observed for approximately 4.5 hours at 610 MHz with the GMRT. Observations were carried out in dual band, spectral line mode, the former to maximize bandwidth and the latter to minimize chromatic aberration. Two sidebands, each of 128 spectral channels of 125 kHz, were centred on 602 and 618 MHz to give a total of 32 MHz bandwidth, with two independent circular polarizations recorded. Sources were extracted with the AIPS task SAD. A conservative peak flux density detection limit of 5 sigma (i.e. 300 uJy) was used to minimize the number of noise spikes spuriously detected as sources. In the areas surrounding the five brightest sources, detection was performed separately with higher detection thresholds to account for the higher rms noise. Within the 20% power radius of the GMRT primary beam at 610 MHz (32 arcminutes), 213 sources were discovered above a 5-sigma peak flux density detection limit of 300 uJy. In order to determine the success of the SAD source extraction, both the science images and the residual noise maps were carefully inspected. There were eight extended sources where the Gaussian model fit by SAD inadequately described the data: these are marked by source_flag = 'a' in this table. The characteristics of these sources were determined using the AIPS task TVSTAT, and contour plots of them are shown in Fig. 1 of the reference paper. Five of these appear to contain two peaks joined by extended emission, that is, they are double-lobe sources. This table was created by the HEASARC in June 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/378/995">CDS Catalog J/MNRAS/378/995</a> file table1.dat. This is a service provided by NASA HEASARC . 2007MNRAS.378..995M https://heasarc.gsfc.nasa.gov/W3Browse/all/gmrt1hxcsf.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=gmrt1hxcsf& GET text/xml 180 99999 true 26.46916667 -5.09008333 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=gmrt1hxcsf GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_gmrt1hxcsf&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public gmrt1hxcsf Giant Metrewave Radio Telescope 1h XMM/Chandra Survey Fld 610-MH name Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable flux_610_mhz Peak Flux Density at 610 MHz mJy/beam phot.flux.density;em.radio.400-750MHz double nullable int_flux_610_mhz Integrated Flux Density at 610 MHz mJy phot.flux.density;em.radio.400-750MHz double nullable int_flux_610_mhz_error Error on the Best Determination of the Flux Density mJy stat.error;phot.flux.density;em.radio.400-750MHz double nullable angular_size Angular Size arcsec phys.angSize double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable snr_610_mhz Signal-to-Noise Ratio of the Detection stat.snr;phot.flux.density;em.radio.400-750MHz double nullable source_flag Flag [a] Indicates Source Parameters Extracted Using TVSTAT meta.code;src char nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double 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