J/A+A/602/A85ivo://CDS.VizieR/J/A+A/602/A85doi:10.26093/cds/vizier.36020085CDSKruehler T.Kuncarayakti H.Schady P.Anderon J.P.Galbany L.,Gensior J.2017-07-10T12:18:24Z2017-06-20T09:18:15ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomySpatially resolved spectroscopy of the environments of explosive transients carries detailed information about the physical properties of the stellar population that gave rise to the explosion, and thus the progenitor itself. Here, we present new observations of ESO184-G82, the galaxy hosting the archetype of the {gamma}-ray burst/supernova connection, GRB 980425/SN 1998bw, obtained with the integral field spectrograph MUSE mounted at the Very Large Telescope. These observations have yielded detailed maps of emission-line strength for various nebular lines along with physical parameters such as dust extinction, stellar age, and oxygen abundance on spatial scales of 160pc. The immediate environment of GRB 980425 is young 5-8Myr) and consistent with a mildly extinguished (AV~0.1mag) progenitor of zero-age main-sequence mass between 25 M_{sun}_ and 40 M_{sun}_ and an oxygen abundance 12+log(O=H)~8.2 (Z~0.3Z_{sun}_), which is slightly lower than that of an integrated measurement of the whole galaxy (12+log(O=H)~8.3) and a prominent nearby HII region (12+log(O/H)~8.4). This region is significantly younger than the explosion site, and we argue that a scenario in which the GRB progenitor formed in this environment and was subsequently ejected appears very unlikely. We show that empirical strong-line methods based on [O iii] and/or [N ii] are inadequate to produce accurate maps of oxygen abundance at the level of detail of our MUSE observation as these methods strongly depend on the ionization state of the gas. The metallicity gradient in ESO184-G82 is -0.06dex/kpc, indicating that the typical offsets of at most few kpc for cosmological GRBs on average have a small impact on oxygen abundance measurements at higher redshift.2017A&A...602A..85Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/602/A85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/602/A85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/602/A85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/602/A85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/602/A85https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/602/A85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/602/A85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/602/A85/list (Information on datacude)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/602/A85/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/602/A85/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/602/A85/list?GETtext/xml+votable180.050000true293.7684-52.843860.0055555555555555566/47217https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/602/A85?format=asciiGamma-raydefaultJ/A+A/602/A85/listInformation on datacuderecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainscaleScale of the imagearcsec/pixinstr.scalefloatNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintblambdaLower value of wavelength interval0.1nmem.wlfloatBlambdaUpper value of wavelength interval0.1nmem.wlfloatdlambdaWavelenght resolution0.1nmpos.angResolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS filemeta.id;meta.fitscharTitleTitle of the FITS file extensionmeta.title;phys.angSize;meta.fitschar