J/MNRAS/466/1242ivo://CDS.VizieR/J/MNRAS/466/1242doi:10.26093/cds/vizier.74661242CDSSobral D.Matthee J.Best P.Stroe A.Rottgering H.Oteo I.Smail I.,Morabito L.Paulino-afonso A.2024-08-17T20:17:34Z2020-01-17T14:29:06ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsline-intensitiesphotometryWe present the CAlibrating LYMan-{alpha} with H{alpha} (CALYMHA) pilot survey and new results on Lyman {alpha} (Ly{alpha}) selected galaxies at z~2. We use a custom-built Ly{alpha} narrow-band filter at the Isaac Newton Telescope, designed to provide a matched volume coverage to the z=2.23H{alpha} HiZELS survey. Here, we present the first results for the COSMOS and UDS fields. Our survey currently reaches a 3{sigma} line flux limit of ~4x10^-17^erg/s/cm^2^, and a Ly{alpha} luminosity limit of ~10^42.3^erg/s. We find 188 Ly{alpha} emitters over 7.3x10^5^Mpc^3^, but also find significant numbers of other line-emitting sources corresponding to HeII, CIII] and CIV emission lines. These sources are important contaminants, and we carefully remove them, unlike most previous studies. We find that the Ly{alpha} luminosity function at z=2.23 is very well described by a Schechter function up to L_Ly{alpha}_~=10^43^erg/s^ with L*=10^42.59(10^42.75^-10^42.01^)erg/s, {phi}*=10^-3.09^(10^-3.43^-10^2.95)Mpc^-3^ and {alpha}=-1.75+/-0.25. Above L_Ly{alpha}_~=10^43^erg/s, the Ly{alpha} luminosity function becomes power-law like, driven by X-ray AGN. We find that Ly{alpha}-selected emitters have a high escape fraction of 37+/-7 per cent, anticorrelated with Ly{alpha} luminosity and correlated with Ly{alpha} equivalent width. Ly{alpha} emitters have ubiquitous large (~=40kpc) Ly{alpha} haloes, ~2 times larger than their H{alpha} extents. By directly comparing our Ly{alpha} and H{alpha} luminosity functions, we find that the global/overall escape fraction of Ly{alpha} photons (within a 13kpc radius) from the full population of star-forming galaxies is 5.1+/-0.2 per cent at the peak of the star formation history. An extra 3.3+/-0.3 per cent of Ly{alpha} photons likely still escape, but at larger radii.2017MNRAS.466.1242Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/466/1242CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/466/1242https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/466/1242http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/466/1242https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/466/1242https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/466/1242http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/466/1242GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/466/1242/tablea2 (Catalogue of 440 candidate line emitters selected in COSMOS and UDS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/466/1242/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/466/1242/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/466/1242/tablea2?GETtext/xml+votable180.050000true150.678816672.214702780.0055555555555555565/6814 6/17679 17688 17690 27245 27247 273444.748911017118645e-19 4.929271970803781e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/466/1242?format=asciidefaultJ/MNRAS/466/1242/tablea2Catalogue of 440 candidate line emitters selected in COSMOS and UDSumagCFHT u magnitude (AB)magphot.mag;em.opt.UfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (CALYMHA-S16-NNN)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNB392INT/WFC NB392 (3918{AA}) magnitude (AB)magphot.flux.density;em.IRfloatFluxFlux in NB filtermW.m**-2phot.flux.density;em.IRdoublelogFluxlog of flux in NB filterlog(mW.m**-2)phot.flux.density;em.IRdoubleEWobsObserved equivalent width0.1nmspect.line.eqWidthdoubleSIGMA3Significance cutstat.fit.goodnessdouble