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dc.contributor.authorKinney, Anne Louisept_BR
dc.contributor.authorCalzetti, Danielapt_BR
dc.contributor.authorBica, Eduardo Luiz Damianipt_BR
dc.contributor.authorStorchi-Bergmann, Thaisapt_BR
dc.date.accessioned2015-01-08T02:13:03Zpt_BR
dc.date.issued1994pt_BR
dc.identifier.issn0004-637Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108832pt_BR
dc.description.abstractThe dust reddening law from the UV to the near-IR for the extended regions of galaxies is here derived from the spectral distributions of the starburst spiral galaxies NGC 7552 and NGC 5236. The centers of these galaxies have similar absorption and emission line spectra, ditfering only in the strength of their interstellar lines and in the continuum distribution, with NGC 7552 appearing more reddened than NGC 5236. The disk of NGC 7552 is more inclined, and there is evidence that its center is observed through additional foreground dust and gas clouds, as compared to the center of NGC 5236. While the galaxies can be expected to have similar dust content, they are known to have different dust path lengths to our line of sight. Therefore, differences in the shape of the spectra can be attributed mainly to the effects of dust, allowing us to probe for the first time the properties of the reddening law outside the local group of galaxies. We derive the reddening law based on the optical depth of the emission Iines of Hα and Hβ and also based on the continuum distribution. We find that the optical depth from the emission line regions are about twice the optical depth of the continuum regions. Thus, dereddening a starburst galaxy by scaling the Milky Way reddening laws to optical depths obtained from the Hα/Hβ line ratio overcompensates for the effect of dust.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe Astrophysical journal. Chicago. Vol. 429, no. 1, pt. 1 (July 1994), p. 172-176pt_BR
dc.rightsOpen Accessen
dc.subjectDust, extinctionen
dc.subjectMateria interestelarpt_BR
dc.subjectGalaxies: individual (NGC 5236, NGC 7552)en
dc.subjectPoeira cosmicapt_BR
dc.subjectEspectros astronômicospt_BR
dc.subjectGalaxies: ISMen
dc.subjectGalaxies: starbursten
dc.subjectGaláxia NGC 5236pt_BR
dc.subjectGaláxia NGC 7552pt_BR
dc.subjectUltraviolet: galaxiesen
dc.titleThe reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000220597pt_BR
dc.type.originEstrangeiropt_BR


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