J/MNRAS/405/436ivo://CDS.VizieR/J/MNRAS/405/436doi:10.26093/cds/vizier.74050436CDSIshwara-Chandra C.H.Sirothia S.K.Wadadekar Y.Pal S.Windhorst R.2024-07-11T20:16:55Z2011-09-15T08:48:08ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-galaxiesIt has been known for nearly three decades that high-redshift radio galaxies exhibit steep radio spectra, and hence ultrasteep spectrum radio sources provide candidates for high-redshift radio galaxies. Nearly all radio galaxies with z>3 have been found using this redshift-spectral index correlation. We have started a programme with the Giant Metrewave Radio Telescope (GMRT) to exploit this correlation at flux density levels about 10 to 100 times deeper than the known high-redshift radio galaxies which were identified primarily using the already available radio catalogues. In our programme, we have obtained deep, high-resolution radio observations at 150MHz with GMRT for several "deep" fields which are well studied at higher radio frequencies and in other bands of the electromagnetic spectrum, with an aim to detect candidate high-redshift radio galaxies. In this paper we present results from the deep 150-MHz observations of the LBDS-Lynx field (Leiden-Berkeley Deep Survey), which has been already imaged at 327, 610 and 1412MHz with the Westerbork Synthesis Radio Telescope and at 1400 and 4860MHz with the Very Large Array.2010MNRAS.405..436Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/405/436CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/62 : The Westerbork Northern Sky Survey (Leiden, 1998)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)J/A+AS/58/1 : 1412 MHz catalogue of Westerbork survey. I. (Windhorst+, 1984)J/A+AS/71/221 : The 65W part of the WSRT 21 cm survey in Lynx (Oort, 1987)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/405/436https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/405/436http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/405/436https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/405/436https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/405/436http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/405/436GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/405/436/table3 (GMRT 150-MHz sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/405/436/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/405/436/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/405/436/table3?GETtext/xml+votable180.050000true127.6487545.7248890.005555555555555556Cone search capability for table J/MNRAS/405/436/table4 (Steep spectrum sources which do not have counterparts in the SDSS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/405/436/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/405/436/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/405/436/table4?GETtext/xml+votable180.050000true127.4487544.3434720.0055555555555555565/1623 1628-1629 1800 6/6491 6520-6521 6523-6526 7176 7178-7179 72089.939104750406538e-26 3.220269899637266e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/405/436?format=asciiRadiodefaultJ/MNRAS/405/436/table3GMRT 150-MHz sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGMRTGMRT designation (JHHMMSS+DDMMSS) (G1)meta.id;meta.maincharS150? GMRT flux density at 150MHzmJyphot.flux.density;em.radio.100-200MHzfloatnullableS327? WSRT flux density at 327MHzmJyphot.flux.density;em.radio.200-400MHzfloatnullableS327w? WENSS flux density at 327MHz (VIII/62)mJyphot.flux.density;em.radio.200-400MHzfloatnullableS610? WSRT flux density at 610MHzmJyphot.flux.density;em.radio.400-750MHzfloatnullableS1412a? WSRT flux density at 1412MHz from Windhorst et al., 1984, Cat. J/A+AS/58/1mJyphot.flux.density;em.radio.750-1500MHzfloatnullableS1412b? WSRT flux density at 1412MHz from Oort, 1987, Cat. J/A+AS/71/221mJyphot.flux.density;em.radio.750-1500MHzfloatnullableS1400n? NVSS flux density at 1400MHz (VIII/65)mJyphot.flux.density;em.radio.750-1500MHzfloatnullableS1400f? FIRST flux density at 1400MHz (VIII/71)mJyphot.flux.density;em.radio.750-1500MHzfloatnullableS1462? VLA flux density at 1462MHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullableS4860? VLA flux density at 4860MHzmJyphot.flux.density;em.radio.3-6GHzfloatnullablealpha? Spectral index from the fitspect.indexfloatnullableSEDPlot the radio spectrum with SPECFIND (Vollmer et al. 2009, Cat. VIII/85)meta.ref.urlcharSimbadSimbad column added by the CDScharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJ/MNRAS/405/436/table4Steep spectrum sources which do not have counterparts in the SDSSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGMRTGMRT designation (JHHMMSS+DDMMSS) (G1)meta.id;meta.maincharS150? GMRT flux density at 150MHzmJyphot.flux.density;em.radio.100-200MHzfloatnullablealpha? Spectral index from the fitspect.indexfloatnullableSEDPlot the radio spectrum with SPECFIND (Vollmer et al. 2009, Cat. VIII/85)meta.ref.urlcharSimbadSimbad column added by the CDScharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main