GMRTLHCAT ivo://nasa.heasarc/gmrtlhcat NASA/GSFC HEASARC Garn et al. 2026-10-02 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a source catalog based on observations of the Lockman Hole with the Giant Metrewave Radio Telescope (GMRT) taken at 610 MHz (49 cm). Twelve pointings were observed, covering a total area of ~5 deg<sup>2</sup> with a resolution of 6 x 5 arcsec<sup>2</sup>, position angle +45 degrees. The majority of the pointings have an rms noise of ~ 60 µJy/beam (µJy/beam) before correction for the attenuation of the GMRT primary beam. The techniques used for data reduction and the production of a mosaicked image of the region are described in the reference paper, where the final mosaic is presented, along with a catalog of 2845 sources detected above the 6-sigma threshold which is contained in this table. In the paper, radio source counts are calculated at 610 MHz and combined with existing 1.4-GHz source counts, in order to show that pure luminosity evolution of the local radio luminosity functions for active galactic nuclei and starburst galaxies is sufficient to account for the two source counts simultaneously. The 'central region' of the Lockman Hole, consisting of 12 pointings spaced by 36 arcminutes in a hexagonal pattern (shown in Fig. 1 of the reference paper) was observed on 2004 July 24 and 25 using the GMRT. The observations were made in two 16-MHz sidebands centered on 610 MHz, each split into 128 spectral channels, with a 16.9s integration time. This table was created by the HEASARC in February 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/387/1037">CDS Catalog J/MNRAS/387/1037</a> file catalog.dat. This is a service provided by NASA HEASARC . 2008MNRAS.387.1037G https://heasarc.gsfc.nasa.gov/W3Browse/all/gmrtlhcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=gmrtlhcat& GET text/xml 180 99999 true 159.69329167 56.82883333 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=gmrtlhcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_gmrtlhcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public gmrtlhcat Giant Metrewave Radio Telescope Lockman Hole 610-MHz Radio Sourc name IAU Designation of Source (GMRTLH JHHMMSS.s+DDMMSS) meta.id;meta.main char nullable ra Centroid Right Ascension degree pos.eq.ra;meta.main double nullable dec Centroid Declination degree pos.eq.dec;meta.main double nullable flux_610_mhz Peak Pixel Brightness (in mJy/beam) mJy/beam phot.flux.density;em.radio.400-750MHz double nullable rms_610_mhz Local RMS Noise (in mJy/beam) mJy/beam stat.error;phot.flux.density;em.radio.400-750MHz double nullable int_flux_610_mhz Integrated Flux at 610MHz mJy phot.flux.density;em.radio.400-750MHz double nullable int_flux_610_mhz_error Error for Integrated Flux mJy stat.error;phot.flux.density;em.radio.400-750MHz double nullable sextractor_db_flag Source Extractor Flag [0123] meta.code.qual short nullable centroid_x_pixel Centroid X Pixel Location (Nearest Pixel) pos.cartesian.x;instr.pixel short nullable bii Centroid Galactic Latitude degree pos.galactic.lat double nullable lii Centroid Galactic Longitude degree pos.galactic.lon double nullable centroid_y_pixel Centroid Y Pixel Location (Nearest Pixel) pos.cartesian.y;instr.pixel short 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