J/MNRAS/498/609ivo://CDS.VizieR/J/MNRAS/498/609doi:10.26093/cds/vizier.74980609CDSHuang T.-C.Matsuhara H.Goto T.Shim H.Kim S.J.Malkan M.A.,Hashimoto T.Hwang H.S.Oi N.Toba Y.Lee D.Santos D.J.D.Takagi T.2024-08-21T20:16:11Z2023-11-03T08:41:36ZCDS support team

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

cds-question@unistra.frinfrared-sourcesastrometryvisible-astronomysurveysThe AKARI infrared (IR) space telescope conducted two surveys (Deep and Wide) in the North Ecliptic Pole (NEP) field to find more than 100000 IR sources using its infrared camera (IRC). IRC's nine filters, which cover wavebands from 2 to 24{mu}m continuously, make AKARI unique in comparison with other IR observatories such as Spitzer or WISE. However, studies of the AKARI NEP-Wide field sources had been limited due to the lack of follow-up observations in the ultraviolet (UV) and optical. In this work, we present the Canada-France-Hawaii Telescope MegaPrime/MegaCam u-band source catalogue of the AKARI NEP-Wide field. The observations were taken in seven nights in 2015 and 2016, resulting in 82 observed frames covering 3.6deg^2^. The data reduction, image processing, and source extraction were performed in a standard procedure using the ELIXIR pipeline and the ASTROMATIC software, and eventually 351635 sources have been extracted. The data quality is discussed in two regions (shallow and deep) separately, due to the difference in the total integration time (4520 and 13910s). The 5{sigma} limiting magnitude, seeing full width at half-maximum, and the magnitude at 50 per cent completeness are 25.38mag (25.79mag in the deep region), 0.82arcsec (0.94arcsec), and 25.06mag (25.45mag), respectively. The u-band data provide us with critical improvements to photometric redshifts and UV estimates of the precious infrared sources from the AKARI space telescope.2020MNRAS.498..609Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/498/609CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/498/609https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/498/609http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/498/609https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/498/609https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/498/609http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/498/609GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/498/609/tableb1 (A few rows of the u-band source catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/498/609/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/498/609/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/498/609/tableb1?GETtext/xml+votable180.050000true269.755640265.17272410.0055555555555555565/4010 6/10237 10239 11605 11607 15358-15359 160464.742277991469443e-19 5.500300350312679e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/498/609?format=asciiOpticalInfrareddefaultJ/MNRAS/498/609/tableb1A few rows of the u-band source catalogueflagSource extraction flag (1)meta.code.errorintCSStar classifier based on the morphology of the sourcemeta.code.classfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/351635] Source internal identifiermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedumagCFHT/MegaCam u-band AB magnitudemagphot.mag;em.opt.Ufloate_umagError on umagmagstat.error;phot.magfloat