J/other/JApA/44.ivo://CDS.VizieR/J/other/JApA/44.88CDSSinha A.Mangla S.Abhirup D.2023-12-14T18:04:08Z2023-11-15T07:31:46ZCDS support team

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

cds-question@unistra.frradio-sourcesradio-galaxiesgalaxy-classification-systemsUnderstanding the spectral properties of sources is crucial for the characterization of the radio source population. In this work, we have extensively studied the ELAIS N1 field using various low-frequency radio observations. For the first time, we presented the 1250MHz observations of the field using the upgraded Giant Meterwave Radio Telescope (uGMRT) that reach a central off-source RMS noise of ~12uJy/beam. A source catalog of 1086 sources is compiled at 5{sigma} threshold (>60uJy) to derive the normalized differential source counts at this frequency, which is consistent with existing observations and simulations. We presented the spectral indices derived in two ways: two-point spectral indices and by fitting a power-law. The latter yielded a median {alpha}=-0.57+/-0.14, and we identified nine ultra-steep spectrum sources using these spectral indices. Further, using a radio color diagram, we identified the three mega-hertz peaked spectrum (MPS) sources, while three other MPS sources are identified from the visual inspection of the spectra, the properties of which are discussed. In our study of the classified sources in the ELAIS N1 field, we presented the relationship between {alpha} and z. We found no evidence of an inverse correlation between these two quantities and suggested that the nature of the radio spectrum remains independent of the large-scale properties of the galaxies that vary with redshifts.2023JApA...44...88Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/JApA/44.88CatalogResearchIsServedByTAP 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/MNRAS/490/243 : ELAIS N1 field uGMRT 400MHz source catalogJ/MNRAS/497/5383 : GMRT 610-MHz survey of ELAIS N1 (Ishwara-Chandra+, 2020)J/A+A/672/A178 : Radio galaxy alignment in ELAIS-N1 (Simonte+, 2023)J/A+A/674/A119 : LoTTS Deep Fields ELAIS-N1 (Snidaric+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/JApA/44.88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/JApA/44.88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/JApA/44.88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/JApA/44.88https://vizier.iucaa.in/viz-bin/votable?-source=J/other/JApA/44.88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/JApA/44.88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/JApA/44.88/table2 (Source catalogue at 1250MHz from the uGMRT observations of the ELAIS N1 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/JApA/44.88/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/other/JApA/44.88/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/JApA/44.88/table2?GETtext/xml+votable180.050000true243.435210662632854.68861791286990.0055555555555555565/2538 6/8.282586962885013e-25 8.282586962885013e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/JApA/44.88?format=asciiOpticalRadiodefaultJ/other/JApA/44.88/table2Source catalogue at 1250MHz from the uGMRT observations of the ELAIS N1 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[0/1131] Source identification number (Source_id)meta.id;meta.mainintRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (DEC)degpos.eq.dec;meta.mainFtotTotal flux at 1250MHz (Total_flux)mJyphot.flux.density;em.radio.750-1500MHzdoubleFpeakPeak flux at 1250MHz (Peak_flux)mJy/beamphot.flux.density;em.radio.750-1500MHzdoubleMajorMajor axis (Major)arcsecphys.angSizefloatMinorMinor axis (Minor)arcsecphys.angSize;srcfloatRMSRMS (RMS)mJy/beamstat.stdevfloat