GMRTXL240M ivo://nasa.heasarc/gmrtxl240m NASA/GSFC HEASARC Tasse et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The low-frequency radio survey of the XMM-Large Scale Structure (XMM-LSS) field centered at RA (J2000) = 2<sup>h</sup>24<sup>m</sup>00<sup>s</sup>, Dec (J2000) = -4<sup>0</sup>09'47" aims to study the connection between the extragalactic radio source populations and their environment as traced by X-ray and optical emission. In their paper, the authors present new radio observations of the XMM-LSS field carried out using the Giant Meterwave Radio Telescope (GMRT) at 240 and 610 MHz. These observations complement the observations presented by Cohen at al. (2003, ApJ, 591, 640; <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/591/640">CDS Cat. <J/ApJ/591/640></a>) and Tasse et al. (2006, A&A, 456, 791; <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/456/791">CDS Cat. <J/A+A/456/791></a>) at 74 and 325 MHz with the Very Large Array (VLA). At 240 and 610 MHz, the authors reach noise levels of ~2.5 and ~0.3 mJy/beam, leading to the detection of 466 and 769 sources over 18.0 and 12.7 degree<sup>2</sup> with resolutions of 14.7 arcseconds and 6.5 arcseconds, respectively. Combining these data with the available source lists at 74 MHz, 325 MHz (Tasse et al., 2006) and 1400MHz (NVSS), the authors built a multifrequency catalog containing 1611 radio sources. They checked for consistency of the astrometry and flux density estimates. They fit a simple synchrotron radiation model to the flux density measurements of the 318 radio sources that were detected in at least 4 bands. While ~26% of them showed signature of spectral ageing, ~6% showed self absorption. This table contains the GMRT 240-MHz source list, comprising 388 single sources and 183 components of multiple sources, for a total of 571 entries. For the multiple sources, each component (A, B, etc.) is listed separately, in order of decreasing brightness. This table was created by the HEASARC in February 2012 based on CS Catalog J/A+A/471/1105 file table3.dat. This is a service provided by NASA HEASARC . 2007A&A...471.1105T https://heasarc.gsfc.nasa.gov/W3Browse/all/gmrtxl240m.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=gmrtxl240m& GET text/xml 180 99999 true 35.742125 -6.51566667 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=gmrtxl240m GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_gmrtxl240m&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public gmrtxl240m Giant Metrewave Radio Telescope XMM Large Scale Structure 240-MH name Source Designation ([TRB2007] JHHMM.m+DDMMc) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable ra_error RMS Uncertainty 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 RMS Uncertainty in Declination arcsec stat.error;pos.eq.dec;meta.main double nullable flux_240_mhz Integrated Flux Density of Individual Gaussian Fitting Component at 240MHz mJy phot.flux.density;em.radio.200-400MHz double nullable flux_240_mhz_error RMS Uncertainty in Int. Flux Density of Individual Gaussian Fitting Component mJy stat.error;phot.flux.density;em.radio.200-400MHz double nullable spectral_index_limit Limit Flag for Spectral Index meta.code;spect.index char nullable spectral_index Spectral Index, with Respect to NVSS Flux Density (1.4GHz) spect.index double nullable tot_flux_240_mhz Total Integrated Flux Density at 240MHz mJy phot.flux.density;em.radio.200-400MHz double nullable major_axis_error RMS Uncertainty in Major Axis arcsec stat.error;phys.size.smajAxis double nullable major_axis Deconvolved Size of Major Axis, or the 2-Sigma Upper Limit If Source Unresolved arcsec phys.size.smajAxis double nullable minor_axis Deconvolved Size of Minor Axis, or 2-Sigma Upper Limit If Source Is Unresolved arcsec phys.size.sminAxis double nullable minor_axis_error RMS Uncertainty in Minor Axis arcsec stat.error;phys.size.sminAxis double nullable lii Galactic Longitude degree pos.galactic.lon double nullable major_axis_limit Limit Flag for Major Axis meta.code;phys.size.smajAxis char nullable tot_flux_240_mhz_error RMS Uncertainty in Total Integrated Flux Density mJy stat.error;phot.flux.density;em.radio.200-400MHz double nullable source_type Flag [SMC] Indicates Source Type: (S)ingle, (M)ultiple or (C)omponent src.morph char nullable position_angle_error RMS Uncertainty in Position Angle degree stat.error;pos.posAng double nullable bii Galactic Latitude degree pos.galactic.lat double nullable minor_axis_limit Limit Flag for Minor Axis meta.code;phys.size.sminAxis char nullable tot_flux_240_mhz_flag Flag [P] Indicates Flux Calculated with Pixel-Based Method meta.code;phot.flux.density;em.radio.200-400MHz char nullable position_angle Position Angle of Major Axis degree pos.posAng 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