J/MNRAS/508/1084ivo://CDS.VizieR/J/MNRAS/508/1084doi:10.26093/cds/vizier.75081084CDSKumari N.Amorin R.Perez-Montero E.Vilchez J.Maiolino R.2024-08-21T20:18:39Z2021-10-18T08:57:03ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyh-ii-regionsWe investigate radiation hardness within a representative sample of 67 nearby (0.02<~z<~0.06) star-forming (SF) galaxies using the integral field spectroscopic data from the MaNGA survey. The softness parameter {eta}=(O^+^/O^2+^)/(S^+^/S^2+^) is sensitive to the spectral energy distribution of the ionizing radiation. We study {eta} via the observable quantity {eta}'(=([OII]/[OIII])/([SII][SIII])). We analyze the relation between radiation hardness (traced by {eta} and {eta}') and diagnostics sensitive to gas-phase metallicity, electron temperature, density, ionization parameter, effective temperature, and age of ionizing populations. It is evident that low metallicity is accompanied by low log{eta}', i.e. hard radiation field. No direct relation is found between radiation hardness and other nebular parameters though such relations cannot be ruled out. We provide empirical relations between log{eta} and strong emission line ratios N2, O3N2, and Ar3O3, which will allow future studies of radiation hardness in SF galaxies where weak auroral lines are undetected. We compare the variation of [OIII]/[OII] and [SIII]/[SII] for MaNGA data with SF galaxies and HII regions within spiral galaxies from literature and find that the similarity and differences between different data set are mainly due to the metallicity. We find that predictions from photoionization models considering young and evolved stellar populations as ionizing sources in good agreement with the MaNGA data. This comparison also suggests that hard radiation fields from hot and old low-mass stars within or around SF regions might significantly contribute to the observed {eta} values.2021MNRAS.508.1084Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/508/1084CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/594/A36 : CALIFA Survey DR3 list of galaxies (Sanchez+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/508/1084https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/508/1084http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/508/1084https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/508/1084https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/508/1084http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/508/1084GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/508/1084/table1 (General properties of MaNGA galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/508/1084/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/508/1084/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/508/1084/table1?GETtext/xml+votable180.050000true204.5129226.3381770.0055555555555555566/4682 4861 4919 5117 5368 5494 5535 5558 5583 5615 5683 5798 5800 5810 5836 5840 5862 5867 6213 6367 6396 6442 6535 6560 6604 6608 6625 6643 6654-6655 6742 6913 7231 7308 8891 9470 9508 9633 9830 9853 9941 9952 9961 10026 10104 10192 10257 10270 10721 10723 10930 10978 11047 11049 11380 11593 12383 17747 19121 23103 23182 28319 28365 28369https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/508/1084?format=asciiOpticaldefaultJ/MNRAS/508/1084/table1General properties of MaNGA galaxieszRedshiftsrc.redshiftfloatSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlate-IFUPlate identifications mentioned in DR14 catalogueobs.fieldcharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainlog(M*)logarithm of stellar masslog(solMass)phys.massfloatlog(SFR)logarithm of star formation ratelog(solMass.yr**-1)phys.SFRfloatScaleSpatial Scalekpc/arcsecinstr.scalefloat