The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236
Autor(a) principal: | |
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Data de Publicação: | 1994 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108832 |
Resumo: | The 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. |
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Kinney, Anne LouiseCalzetti, DanielaBica, Eduardo Luiz DamianiStorchi-Bergmann, Thaisa2015-01-08T02:13:03Z19940004-637Xhttp://hdl.handle.net/10183/108832000220597The 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.application/pdfengThe Astrophysical journal. Chicago. Vol. 429, no. 1, pt. 1 (July 1994), p. 172-176Materia interestelarPoeira cosmicaEspectros astronômicosGaláxia NGC 5236Galáxia NGC 7552Dust, extinctionGalaxies: individual (NGC 5236, NGC 7552)Galaxies: ISMGalaxies: starburstUltraviolet: galaxiesThe reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236Estrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000220597.pdf000220597.pdfTexto completo (inglês)application/pdf226716http://www.lume.ufrgs.br/bitstream/10183/108832/1/000220597.pdf716ed8224aa0e34b0440b7d10963a2aeMD51TEXT000220597.pdf.txt000220597.pdf.txtExtracted Texttext/plain110http://www.lume.ufrgs.br/bitstream/10183/108832/2/000220597.pdf.txt4c6d44fbfed3dc8295eddc703df5bf45MD52THUMBNAIL000220597.pdf.jpg000220597.pdf.jpgGenerated Thumbnailimage/jpeg2166http://www.lume.ufrgs.br/bitstream/10183/108832/3/000220597.pdf.jpga8cad8af2cd6645bd0efe660ef679448MD5310183/1088322024-04-14 06:46:00.580319oai:www.lume.ufrgs.br:10183/108832Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-14T09:46Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 |
title |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 |
spellingShingle |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 Kinney, Anne Louise Materia interestelar Poeira cosmica Espectros astronômicos Galáxia NGC 5236 Galáxia NGC 7552 Dust, extinction Galaxies: individual (NGC 5236, NGC 7552) Galaxies: ISM Galaxies: starburst Ultraviolet: galaxies |
title_short |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 |
title_full |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 |
title_fullStr |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 |
title_full_unstemmed |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 |
title_sort |
The reddening law outside the local group galaxies : the case of NGC 7552 and NGC 5236 |
author |
Kinney, Anne Louise |
author_facet |
Kinney, Anne Louise Calzetti, Daniela Bica, Eduardo Luiz Damiani Storchi-Bergmann, Thaisa |
author_role |
author |
author2 |
Calzetti, Daniela Bica, Eduardo Luiz Damiani Storchi-Bergmann, Thaisa |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Kinney, Anne Louise Calzetti, Daniela Bica, Eduardo Luiz Damiani Storchi-Bergmann, Thaisa |
dc.subject.por.fl_str_mv |
Materia interestelar Poeira cosmica Espectros astronômicos Galáxia NGC 5236 Galáxia NGC 7552 |
topic |
Materia interestelar Poeira cosmica Espectros astronômicos Galáxia NGC 5236 Galáxia NGC 7552 Dust, extinction Galaxies: individual (NGC 5236, NGC 7552) Galaxies: ISM Galaxies: starburst Ultraviolet: galaxies |
dc.subject.eng.fl_str_mv |
Dust, extinction Galaxies: individual (NGC 5236, NGC 7552) Galaxies: ISM Galaxies: starburst Ultraviolet: galaxies |
description |
The 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. |
publishDate |
1994 |
dc.date.issued.fl_str_mv |
1994 |
dc.date.accessioned.fl_str_mv |
2015-01-08T02:13:03Z |
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000220597 |
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http://hdl.handle.net/10183/108832 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The Astrophysical journal. Chicago. Vol. 429, no. 1, pt. 1 (July 1994), p. 172-176 |
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openAccess |
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