Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331
We present images of NGC 7331 obtained with GALEX and Spitzer, tracing UV and IR signatures of star formation. NGC 7331's morphology at 8-850 μm is dominated by a central dust ring. This structure is a vigorous site of star formation (hosting one-third of the present activity) but remains incon...
| Autor: | |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2007 |
| País: | España |
| Recursos: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/51758 |
| Acesso em linha: | https://hdl.handle.net/20.500.14352/51758 |
| Access Level: | acceso abierto |
| Palavra-chave: | 52 Nearby galaxies survey Multiband imaging photometer Radial extinction profiles Spitzer-space-telescope Virgo cluster galaxies Large-magellanic-cloud Global Schmidt law Spiral galaxies Forming galaxies HII-regions Astrofísica Astronomía (Física) |
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Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331Gil De Paz, Armando52Nearby galaxies surveyMultiband imaging photometerRadial extinction profilesSpitzer-space-telescopeVirgo cluster galaxiesLarge-magellanic-cloudGlobal Schmidt lawSpiral galaxiesForming galaxiesHII-regionsAstrofísicaAstronomía (Física)We present images of NGC 7331 obtained with GALEX and Spitzer, tracing UV and IR signatures of star formation. NGC 7331's morphology at 8-850 μm is dominated by a central dust ring. This structure is a vigorous site of star formation (hosting one-third of the present activity) but remains inconspicuous in our GALEX UV imagery. Radial profile analysis and photometry for discrete UV- and UV+IR-selected substructures indicate a decline in UV extinction with increasing galactocentric distance, although highly attenuated star-forming regions can be found throughout the disk. UV-optical surface brightness profiles suggest a recent birthrate parameter (b_8) that is highest in the outer part of the disk, even though the local star formation intensity peaks in the ring. Bolometric luminosity and UV attenuation are correlated in substructures on 0.4 kpc scales, with a relationship similar to that established for starburst galaxies. The distribution of substructures in L(IR)/L(FUV), L_λ(FUV)/L_λ(NUV) space suggests that the majority of the disk is best characterized by Milky Way-type dust, with the exception of sources in the star-forming ring. As found by Calzetti et al. in M51, the observed 8 and 24 μm luminosity for substructures in NGC 7331 are correlated, showing a decline in L_ν(8 μm)/L_ν(24 μm) with increasing luminosity. We demonstrate the dependence of L_ν(8 μm)/L_ν(24 μm) on the local extinction-corrected Hα surface brightness (hence current Σ_SFR). A power law of slope 1.64 (1.87) accurately describes the Schmidt-law relation versus Σ_H_2 (Σ_gas) for molecular-dominated environments. The same locations show no correlation between Σ_SFR and Σ_HI . For atomic-dominated regions above an apparent local star formation threshold, we found a trend for increasing Σ_SFR at higher Σ_HI , although the Schmidt-law correlation with molecular-only surface density persists in areas dominated by atomic gas.University Chicago PressUniversidad Complutense de Madrid20072007-12-0120072007-12-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/51758reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/517582026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 |
| title |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 |
| spellingShingle |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 Gil De Paz, Armando 52 Nearby galaxies survey Multiband imaging photometer Radial extinction profiles Spitzer-space-telescope Virgo cluster galaxies Large-magellanic-cloud Global Schmidt law Spiral galaxies Forming galaxies HII-regions Astrofísica Astronomía (Física) |
| title_short |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 |
| title_full |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 |
| title_fullStr |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 |
| title_full_unstemmed |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 |
| title_sort |
Ultraviolet and infrared diagnostics of star formation and dust in NGC 7331 |
| dc.creator.none.fl_str_mv |
Gil De Paz, Armando |
| author |
Gil De Paz, Armando |
| author_facet |
Gil De Paz, Armando |
| author_role |
author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
52 Nearby galaxies survey Multiband imaging photometer Radial extinction profiles Spitzer-space-telescope Virgo cluster galaxies Large-magellanic-cloud Global Schmidt law Spiral galaxies Forming galaxies HII-regions Astrofísica Astronomía (Física) |
| topic |
52 Nearby galaxies survey Multiband imaging photometer Radial extinction profiles Spitzer-space-telescope Virgo cluster galaxies Large-magellanic-cloud Global Schmidt law Spiral galaxies Forming galaxies HII-regions Astrofísica Astronomía (Física) |
| description |
We present images of NGC 7331 obtained with GALEX and Spitzer, tracing UV and IR signatures of star formation. NGC 7331's morphology at 8-850 μm is dominated by a central dust ring. This structure is a vigorous site of star formation (hosting one-third of the present activity) but remains inconspicuous in our GALEX UV imagery. Radial profile analysis and photometry for discrete UV- and UV+IR-selected substructures indicate a decline in UV extinction with increasing galactocentric distance, although highly attenuated star-forming regions can be found throughout the disk. UV-optical surface brightness profiles suggest a recent birthrate parameter (b_8) that is highest in the outer part of the disk, even though the local star formation intensity peaks in the ring. Bolometric luminosity and UV attenuation are correlated in substructures on 0.4 kpc scales, with a relationship similar to that established for starburst galaxies. The distribution of substructures in L(IR)/L(FUV), L_λ(FUV)/L_λ(NUV) space suggests that the majority of the disk is best characterized by Milky Way-type dust, with the exception of sources in the star-forming ring. As found by Calzetti et al. in M51, the observed 8 and 24 μm luminosity for substructures in NGC 7331 are correlated, showing a decline in L_ν(8 μm)/L_ν(24 μm) with increasing luminosity. We demonstrate the dependence of L_ν(8 μm)/L_ν(24 μm) on the local extinction-corrected Hα surface brightness (hence current Σ_SFR). A power law of slope 1.64 (1.87) accurately describes the Schmidt-law relation versus Σ_H_2 (Σ_gas) for molecular-dominated environments. The same locations show no correlation between Σ_SFR and Σ_HI . For atomic-dominated regions above an apparent local star formation threshold, we found a trend for increasing Σ_SFR at higher Σ_HI , although the Schmidt-law correlation with molecular-only surface density persists in areas dominated by atomic gas. |
| publishDate |
2007 |
| dc.date.none.fl_str_mv |
2007 2007-12-01 2007 2007-12-01 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/20.500.14352/51758 |
| url |
https://hdl.handle.net/20.500.14352/51758 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
University Chicago Press |
| publisher.none.fl_str_mv |
University Chicago Press |
| dc.source.none.fl_str_mv |
reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
| instname_str |
Universidad Complutense de Madrid (UCM) |
| reponame_str |
Docta Complutense |
| collection |
Docta Complutense |
| repository.name.fl_str_mv |
|
| repository.mail.fl_str_mv |
|
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1869404786642649088 |
| score |
15.301603 |