J/MNRAS/490/243ivo://CDS.VizieR/J/MNRAS/490/243doi:10.26093/cds/vizier.74900243CDSChakraborty A.Roy N.Datta A.Choudhuri S.Datta K.K.Dutta P.,Bharadwaj S.Intema H.Choudhury M.Pal S.Choudhury T.R.2024-08-20T20:13:43Z2019-11-12T08:27:16ZCDS support team

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

cds-question@unistra.frsurveysradio-galaxiesgalaxy-classification-systemsUnderstanding the low-frequency radio sky in depth is necessary to subtract foregrounds in order to detect the redshifted 21 cm signal of neutral hydrogen from the cosmic dawn, the epoch of reionization and the post-reionization era. In this second paper of the series, we present the upgraded Giant Metrewave Radio Telescope (uGMRT) observation of the ELAIS N1 field made at 300-500MHz. The image covers an area of ~1.8deg^2^ and has a central background rms noise of ~15uJy/beam. We present a radio source catalogue containing 2528 sources (with flux densities >100uJy) and normalized source counts derived from that. A detailed comparison of detected sources with previous radio observations is shown. We discuss flux-scale accuracy, positional offsets, spectral index distribution and correction factors in source counts. The normalized source counts are in agreement with previous observations of the same field, as well as model source counts from the Square Kilometre Array Design Study simulation. It shows a flattening below ~1mJy that corresponds to a rise in populations of star-forming galaxies and radio-quiet active galactic nuclei. For the first time, we estimate the spectral characteristics of the angular power spectrum or multi-frequency angular power spectrum of diffuse Galactic synchrotron emission over a wide frequency bandwidth of 300-500MHz from radio interferometric observations. This work demonstrates the improved capabilities of the uGMRT.2019MNRAS.490..243Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/490/243CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)J/AJ/129/1198 : SDSS quasars in SWIRE ELAIS N1 field (Hatziminaoglou+, 2005)J/MNRAS/371/1891 : GOODS ELAIS-N1 24um flux densities (Rodighiero+, 2006)J/ApJ/666/201 : Radio polarimetry of the ELAIS N1 field (Taylor+, 2007)J/MNRAS/383/75 : Deep 610MHz survey of ELAIS-N1 sources (Garn+, 2008)J/MNRAS/395/269 : ELAIS-N1 field 325MHz observations (Sirothia+, 2009)J/ApJ/714/1689 : DRAO ELAIS N1 catalog (Grant+, 2010)J/ApJ/762/93 : PiGSS. III. ELAIS-N1, Coma + Lockman fields (Croft+, 2013)J/MNRAS/472/4259 : IRAC Dark Field, ELAIS-N1 & ADF-S galaxies (Davidge+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/490/243https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/490/243http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/490/243https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/490/243https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/490/243http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/490/243GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/490/243/catalog (uGMRT 400MHz source catalogue for the ELAIS N1 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/490/243/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/243/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/243/catalog?GETtext/xml+votable180.050000true243.7975480654.588478060.0055555555555555565/2538 6/10147 10156 101582.6504278676176564e-25 2.6504278676176564e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/490/243?format=asciiOpticalRadiodefaultJ/MNRAS/490/243/cataloguGMRT 400MHz source catalogue for the ELAIS N1 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[0/2528] Sequential numbermeta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.maine_RAJ2000Error in Right ascension (J2000)arcsecstat.error;pos.eq.rafloatDEJ2000Declination (J2000)degpos.eq.dec;meta.maine_DEJ2000Error in Declinationarcsecstat.error;pos.eq.decfloatTotalFluxFlux density at 400MHzmJyphot.flux.density;em.radio.200-400MHzdoublee_TotalFluxError in flux densitymJystat.errorfloatPeakFluxPeak flux at 400MHzmJy/beamphot.flux.density;em.radio.200-400MHzdoublee_PeakFluxError in peak fluxmJy/beamstat.errorfloatMajorMajor axis of sourcearcsecphys.angSizefloatMinorMinor axis of sourcearcsecphys.angSize;srcfloatPAPosition angledegpos.posAngfloatrmsrms valuemJy/beaminstr.det.noisefloat