J/MNRAS/495/4071ivo://CDS.VizieR/J/MNRAS/495/4071doi:10.26093/cds/vizier.74954071CDSMazumder A.Chakraborty A.Datta A.Choudhuri S.Roy N.Wadadekar Y.,Ishwara-Chandra C.H.2024-08-21T20:14:55Z2020-10-30T15:41:37ZCDS support team

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

cds-question@unistra.frsurveysradio-sourcesgalaxy-classification-systemsOne of the key science goals for the most sensitive telescopes, both current and upcoming, is the detection of the redshifted 21-cm signal from the Cosmic Dawn and Epoch of Reionization. The success of detection relies on accurate foreground modelling for their removal from data sets. This paper presents the characterization of astrophysical sources in the Lockman Hole region. Using 325-MHz data obtained from the Giant Metrewave Radio Telescope, a 6{deg}x6{deg} mosaiced map is produced with an rms reaching 50uJy per beam. A source catalogue containing 6186 sources is created, and the Euclidean normalized differential source counts have been derived from it, consistent with previous observations as well as simulations. A detailed comparison of the source catalogue is also made with previous findings - at both lower and higher frequencies. The angular power spectrum (APS) of the diffuse Galactic synchrotron emission is determined for three different Galactic latitudes using the tapered gridded estimator. The values of the APS lie between ~1 and ~100mK^2^. Fitting a power law of the form Al^-{beta}^ gives values of A and {beta} varying across the latitudes considered. This paper demonstrates, for the first time, the variation of the power-law index for diffuse emission at very high Galactic locations. It follows the same trend that is seen at locations near the Galactic plane, thus emphasizing the need for low-frequency observations for developing better models of the diffuse emission.2020MNRAS.495.4071Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/495/4071CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/495/4071https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/495/4071http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/495/4071https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/495/4071https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/495/4071http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/495/4071GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/495/4071/catalog (The 325MHz source catalogue of Lockman Hole region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/495/4071/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/495/4071/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/495/4071/catalog?GETtext/xml+votable180.050000true167.226156.52850.0055555555555555565/1511 1516-1517 1519-1520 1522 1528 6/6039 6043 6072-6073 6075 6116 6118 6120-6122 7441 7443-74462.1534725313611987e-25 2.1534725313611987e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/495/4071?format=asciiOpticalRadiodefaultJ/MNRAS/495/4071/catalogThe 325MHz source catalogue of Lockman Hole regionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceId[0/6185] Sequential numbermeta.recordintRAJ2000Right Ascension of source (J2000)degpos.eq.ra;meta.maine_RAJ2000Error in Right Ascensionarcsecstat.error;pos.eq.radoubleDEJ2000Declination of sources (J2000)degpos.eq.dec;meta.maine_DEJ2000Error in Declinationarcsecstat.error;pos.eq.decdoubleFluxTotTotal source flux at 325MHzmJyphot.flux.density;em.radio.200-400MHzdoubleFluxPeakPeak source flux at 325MHzmJy/beamphot.flux.density;em.radio.200-400MHzdoublermsIsland RMSmJy/beaminstr.det.noisedoubleMajMajor axisarcminphys.angSizedoubleMinMinor axisarcminphys.angSize;srcdoublePAParallactic angledegpos.posAngdouble