J/MNRAS/465/302ivo://CDS.VizieR/J/MNRAS/465/302doi:10.26093/cds/vizier.74650302CDSMicheva G.Iwata I.Inoue A.K.2024-08-16T20:20:04Z2018-09-07T10:15:10ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiredshiftedinfrared-photometryvisible-astronomybroad-band-photometrysloan-photometrySubaru/SuprimeCam narrow-band photometry of the SSA22 field reveals the presence of four Lyman continuum (LyC) candidates among a sample of 14 active galactic nuclei (AGNs). Two show offsets and likely have stellar LyCin nature or are foreground contaminants. The remaining two LyC candidates are type I AGN. We argue that the average LyC escape fraction of high-redshift, low-luminosity AGN is not likely to be unity, as often assumed in the literature. From direct measurement we obtain the average LyC-to-UV flux density ratio and ionizing emissivity for a number of AGN classes and find it at least a factor of 2 lower than values obtained assuming f_esc_=1. Comparing to recent Ly{alpha} forest measurements, AGNs at redshift z~3 make up at most ~12 per cent and as little as ~5 per cent of the total ionizing budget. Our results suggest that AGNs are unlikely to dominate the ionization budget of the Universe at high redshifts.2017MNRAS.465..302Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/465/302CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/465/316 : Lyman continuum LAEs and LBGs in SSA22 field (Micheva+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/465/302https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/465/302http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/465/302https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/465/302https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/465/302http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/465/302GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/465/302/agn (AGN catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/465/302/agn?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/465/302/agn?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/465/302/agn?GETtext/xml+votable180.050000true334.272410.253890.0055555555555555566/19033 19036https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/465/302?format=asciiOpticalInfrareddefaultJ/MNRAS/465/302/agnAGN catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/14] Running number (number)meta.id;meta.mainintNameID of AGN in paper (AGN1/AGN14) (id)meta.idcharType[1/2] Spectral AGN type: Type 1 or Type 2 (agn_type)src.morph.typeintRAJ2000Right ascension (J2000) (ra_r)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (dc_r)degpos.eq.dec;meta.mainzSpectroscopic redshift (redshift)src.redshiftfloatFWHMR band FWHM in arcsec (r_modelFWHM)arcsecphys.angSize.smajAxisfloatN3mag? Growth curve total AB mag in NB359 (n3_modelmag)magphot.mag;em.IR.3-4umfloatnullablee_N3mag? Growth curve total AB mag error in NB359 (n3_modelmagerr)magstat.error;phot.mag;em.IR.8-15umfloatnullableBmag? Growth curve total AB mag in B (b_modelmag)magphot.mag;em.opt.Bfloatnullablee_Bmag? Growth curve total AB mag error in B (b_modelmagerr)magstat.error;phot.mag;em.opt.BfloatnullableN4magGrowth curve total AB mag in NB497 (n4_modelmag)magphot.mag;em.IR.4-8umfloate_N4magGrowth curve total AB mag error in NB497 (n4_modelmagerr)magstat.error;phot.mag;em.IR.8-15umfloatVmagGrowth curve total AB mag in V (v_modelmag)magphot.mag;em.opt.Vfloate_VmagGrowth curve total AB mag error in V (v_modelmagerr)magstat.error;phot.mag;em.opt.VfloatRmagGrowth curve total AB mag in R (r_modelmag)magphot.mag;em.opt.Rfloate_RmagGrowth curve total AB mag error in R (r_modelmagerr)magstat.error;phot.mag;em.opt.Rfloati'magGrowth curve total AB mag in i' (i_modelmag)magphot.mag;em.opt.Ifloate_i'magGrowth curve total AB mag error in i' (i_modelmagerr)magstat.error;phot.mag;em.opt.Ifloatz'magGrowth curve total AB mag in z' (z_modelmag)magphot.mag;em.opt.Ifloate_z'magGrowth curve total AB mag error in z' (z_modelmagerr)magstat.error;phot.mag;em.opt.IfloatN3magapR? Diameter=1.2 arcsec aperture AB mag in NB359 at R band position (n3_ap12_r_mag)magphot.mag;em.IR.3-4umfloatnullablee_N3magapR? Diameter=1.2 arcsec aperture AB mag error in NB359 at R band position (n3_ap12_r_magerr)magstat.errorfloatnullableBmagapR? Diameter=1.2 arcsec aperture AB mag in B at R band position (b_ap12_r_mag)magphot.mag;em.opt.Bfloatnullablee_BmagapR? Diameter=1.2 arcsec aperture AB mag error in B at R band position (b_ap12_r_magerr)magstat.errorfloatnullableN4magapRDiameter=1.2 arcsec aperture AB mag in NB497 at R band position (n4_ap12_r_mag)magphot.mag;em.IR.4-8umfloate_N4magapRDiameter=1.2 arcsec aperture AB mag error in NB497 at R band position (n4_ap12_r_magerr)magstat.errorfloatVmagapRDiameter=1.2 arcsec aperture AB mag in V at R band position (v_ap12_r_mag)magphot.mag;em.opt.Vfloate_VmagapRDiameter=1.2 arcsec aperture AB mag error in V at R band position (v_ap12_r_magerr)magstat.errorfloatRmagapRDiameter=1.2 arcsec aperture AB mag in R at R band position (r_ap12_r_mag)magphot.mag;em.opt.Rfloate_RmagapRDiameter=1.2 arcsec aperture AB mag error in R at R band position (r_ap12_r_magerr)magstat.errorfloati'magapRDiameter=1.2 arcsec aperture AB mag in i' at R band position (i_ap12_r_mag)magphot.mag;em.opt.Ifloate_i'magapRDiameter=1.2 arcsec aperture AB mag error in i' at R band position (i_ap12_r_magerr)magstat.errorfloatz'magapRDiameter=1.2 arcsec aperture AB mag in z' at R band position (z_ap12_r_mag)magphot.mag;em.opt.Ifloate_z'magapRDiameter=1.2 arcsec aperture AB mag error in z' at R band position (z_ap12_r_magerr)magstat.errorfloatAVGalactic Extinction using IRSA (Av_SandF) (1)magphys.absorption.galfloat