Keck spectroscopy and Spitzer space telescope analysis of the outer disk of the Triangulum spiral galaxy M 33
Identifieur interne : 009508 ( Main/Exploration ); précédent : 009507; suivant : 009509Keck spectroscopy and Spitzer space telescope analysis of the outer disk of the Triangulum spiral galaxy M 33
Auteurs : D. L. Block [Afrique du Sud, Australie] ; F. Combes [France] ; I. Puerari [Mexique] ; K. C. Freeman [Australie] ; A. Stockton [États-Unis] ; G. Canalizo [États-Unis] ; T. H. Jarrett [États-Unis] ; R. Groess [Afrique du Sud] ; G. Worthey [États-Unis] ; R. D. Gehrz [États-Unis] ; C. E. Woodward [États-Unis] ; E. F. Polomski [États-Unis] ; G. G. Fazio [États-Unis]Source :
- Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2007.
Descripteurs français
- Pascal (Inist)
- Spectrométrie, Galaxies spirales, Bras spiral, Age, Etoile carbone, Branche géante asymptotique, Etoile rouge, Bande absorption, Hydrocarbure aromatique polycyclique, Morphologie, Couleur, Métallicité, Formation stellaire, Accrétion, Groupe galaxies, Groupe local, Formation galaxies, Contenu stellaire, Evolution galaxies.
- Wicri :
- topic : Spectrométrie.
English descriptors
- KwdEn :
Abstract
In an earlier study of the spiral galaxy M 33, we photometrically identified arcs or outer spiral arms of intermediate age (0.6-2 Gyr) carbon stars precisely at the commencement of the HI-warp. Stars in the arcs were unresolved, but were likely thermally-pulsing asymptotic giant branch carbon stars. Here we present Keck I spectroscopy of seven intrinsically bright and red target stars in the outer, northern arc in M 33. The target stars have estimated visual magnitudes as faint as V ∼ 25m. Absorption bands of CN are seen in all seven spectra reported here, confirming their carbon star status. In addition, we present Keck II spectra of a small area 0.5 degree away from the centre of M 33; the target stars there are also identified as carbon stars. We also study the non-stellar PAH dust morphology of M 33 secured using IRAC on board the Spitzer Space Telescope. The Spitzer 8 μm image attests to a change of spiral phase at the start of the HI warp. The Keck spectra confirm that carbon stars may safely be identified on the basis of their red J - Ks colours in the outer, low metallicity disk of M 33. We propose that the enhanced number of carbon stars in the outer arms are an indicator of recent star formation, fueled by gas accretion from the HI-warp reservoir.
Affiliations:
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Block</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>School of Computational and Applied Mathematics, University of Witwatersrand, Private Bag 3</s1><s2>Wits 2050</s2><s3>ZAF</s3><sZ>1 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Afrique du Sud</country><wicri:noRegion>Wits 2050</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University</s1><s3>AUS</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University</wicri:noRegion></affiliation></author><author><name sortKey="Combes, F" sort="Combes, F" uniqKey="Combes F" first="F." last="Combes">F. 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Canalizo</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Institute of Geophysics and Planetary Physics and Department of Physics, University of California</s1><s2>Riverside, CA 92521</s2><s3>USA</s3><sZ>6 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Riverside, CA 92521</wicri:noRegion></affiliation></author><author><name sortKey="Jarrett, T H" sort="Jarrett, T H" uniqKey="Jarrett T" first="T. H." last="Jarrett">T. H. Jarrett</name><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>Infrared Processing and Analysis Center, 100-22, CALTECH, 770 South Wilson Ave</s1><s2>Pasadena, CA 91125</s2><s3>USA</s3><sZ>7 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Pasadena, CA 91125</wicri:noRegion></affiliation></author><author><name sortKey="Groess, R" sort="Groess, R" uniqKey="Groess R" first="R." last="Groess">R. Groess</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>School of Computational and Applied Mathematics, University of Witwatersrand, Private Bag 3</s1><s2>Wits 2050</s2><s3>ZAF</s3><sZ>1 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Afrique du Sud</country><wicri:noRegion>Wits 2050</wicri:noRegion></affiliation></author><author><name sortKey="Worthey, G" sort="Worthey, G" uniqKey="Worthey G" first="G." last="Worthey">G. Worthey</name><affiliation wicri:level="1"><inist:fA14 i1="08"><s1>Washington State University, 1245 Webster Hall</s1><s2>Pullman, WA 99163-2814</s2><s3>USA</s3><sZ>9 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Pullman, WA 99163-2814</wicri:noRegion></affiliation></author><author><name sortKey="Gehrz, R D" sort="Gehrz, R D" uniqKey="Gehrz R" first="R. D." last="Gehrz">R. D. Gehrz</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Department of Astronomy, University of Minnesota, 116 Church St. SE</s1><s2>Minneapolis MN 55455</s2><s3>USA</s3><sZ>10 aut.</sZ><sZ>11 aut.</sZ><sZ>12 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Minneapolis MN 55455</wicri:noRegion></affiliation></author><author><name sortKey="Woodward, C E" sort="Woodward, C E" uniqKey="Woodward C" first="C. E." last="Woodward">C. E. Woodward</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Department of Astronomy, University of Minnesota, 116 Church St. SE</s1><s2>Minneapolis MN 55455</s2><s3>USA</s3><sZ>10 aut.</sZ><sZ>11 aut.</sZ><sZ>12 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Minneapolis MN 55455</wicri:noRegion></affiliation></author><author><name sortKey="Polomski, E F" sort="Polomski, E F" uniqKey="Polomski E" first="E. F." last="Polomski">E. F. Polomski</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Department of Astronomy, University of Minnesota, 116 Church St. SE</s1><s2>Minneapolis MN 55455</s2><s3>USA</s3><sZ>10 aut.</sZ><sZ>11 aut.</sZ><sZ>12 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Minneapolis MN 55455</wicri:noRegion></affiliation></author><author><name sortKey="Fazio, G G" sort="Fazio, G G" uniqKey="Fazio G" first="G. G." last="Fazio">G. G. Fazio</name><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>Harvard-Smithsonian Center for Astrophysics, 60 Garden St</s1><s2>Cambridge, MA 02138</s2><s3>USA</s3><sZ>13 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Cambridge, MA 02138</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">07-0376785</idno><date when="2007">2007</date><idno type="stanalyst">PASCAL 07-0376785 INIST</idno><idno type="RBID">Pascal:07-0376785</idno><idno type="wicri:Area/PascalFrancis/Corpus">003A58</idno><idno type="wicri:Area/PascalFrancis/Curation">002630</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">003808</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">003808</idno><idno type="wicri:doubleKey">0004-6361:2007:Block D:keck:spectroscopy:and</idno><idno type="wicri:Area/Main/Merge">009F20</idno><idno type="wicri:Area/Main/Curation">009508</idno><idno type="wicri:Area/Main/Exploration">009508</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Keck spectroscopy and Spitzer space telescope analysis of the outer disk of the Triangulum spiral galaxy M 33</title><author><name sortKey="Block, D L" sort="Block, D L" uniqKey="Block D" first="D. L." last="Block">D. L. Block</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>School of Computational and Applied Mathematics, University of Witwatersrand, Private Bag 3</s1><s2>Wits 2050</s2><s3>ZAF</s3><sZ>1 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Afrique du Sud</country><wicri:noRegion>Wits 2050</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University</s1><s3>AUS</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University</wicri:noRegion></affiliation></author><author><name sortKey="Combes, F" sort="Combes, F" uniqKey="Combes F" first="F." last="Combes">F. Combes</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Observatoire de Paris, LERMA, 61 Av. de l'Observatoire</s1><s2>75014 Paris</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>75014 Paris</wicri:noRegion><placeName><settlement type="city">Paris</settlement><region type="région" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Puerari, I" sort="Puerari, I" uniqKey="Puerari I" first="I." last="Puerari">I. Puerari</name><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Instituto Nacional de Astrofísica, Optica y Electrónica, Calle Luis Enrique Erro 1</s1><s2>72840 Tonantzintla, Puebla</s2><s3>MEX</s3><sZ>3 aut.</sZ></inist:fA14><country>Mexique</country><wicri:noRegion>72840 Tonantzintla, Puebla</wicri:noRegion></affiliation></author><author><name sortKey="Freeman, K C" sort="Freeman, K C" uniqKey="Freeman K" first="K. C." last="Freeman">K. C. Freeman</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University</s1><s3>AUS</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University</wicri:noRegion></affiliation></author><author><name sortKey="Stockton, A" sort="Stockton, A" uniqKey="Stockton A" first="A." last="Stockton">A. Stockton</name><affiliation wicri:level="2"><inist:fA14 i1="05"><s1>Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive</s1><s2>Honolulu, Hawaii</s2><s3>USA</s3><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Hawaï</region></placeName></affiliation></author><author><name sortKey="Canalizo, G" sort="Canalizo, G" uniqKey="Canalizo G" first="G." last="Canalizo">G. Canalizo</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Institute of Geophysics and Planetary Physics and Department of Physics, University of California</s1><s2>Riverside, CA 92521</s2><s3>USA</s3><sZ>6 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Riverside, CA 92521</wicri:noRegion></affiliation></author><author><name sortKey="Jarrett, T H" sort="Jarrett, T H" uniqKey="Jarrett T" first="T. H." last="Jarrett">T. H. Jarrett</name><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>Infrared Processing and Analysis Center, 100-22, CALTECH, 770 South Wilson Ave</s1><s2>Pasadena, CA 91125</s2><s3>USA</s3><sZ>7 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Pasadena, CA 91125</wicri:noRegion></affiliation></author><author><name sortKey="Groess, R" sort="Groess, R" uniqKey="Groess R" first="R." last="Groess">R. Groess</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>School of Computational and Applied Mathematics, University of Witwatersrand, Private Bag 3</s1><s2>Wits 2050</s2><s3>ZAF</s3><sZ>1 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Afrique du Sud</country><wicri:noRegion>Wits 2050</wicri:noRegion></affiliation></author><author><name sortKey="Worthey, G" sort="Worthey, G" uniqKey="Worthey G" first="G." last="Worthey">G. Worthey</name><affiliation wicri:level="1"><inist:fA14 i1="08"><s1>Washington State University, 1245 Webster Hall</s1><s2>Pullman, WA 99163-2814</s2><s3>USA</s3><sZ>9 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Pullman, WA 99163-2814</wicri:noRegion></affiliation></author><author><name sortKey="Gehrz, R D" sort="Gehrz, R D" uniqKey="Gehrz R" first="R. D." last="Gehrz">R. D. Gehrz</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Department of Astronomy, University of Minnesota, 116 Church St. SE</s1><s2>Minneapolis MN 55455</s2><s3>USA</s3><sZ>10 aut.</sZ><sZ>11 aut.</sZ><sZ>12 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Minneapolis MN 55455</wicri:noRegion></affiliation></author><author><name sortKey="Woodward, C E" sort="Woodward, C E" uniqKey="Woodward C" first="C. E." last="Woodward">C. E. Woodward</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Department of Astronomy, University of Minnesota, 116 Church St. SE</s1><s2>Minneapolis MN 55455</s2><s3>USA</s3><sZ>10 aut.</sZ><sZ>11 aut.</sZ><sZ>12 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Minneapolis MN 55455</wicri:noRegion></affiliation></author><author><name sortKey="Polomski, E F" sort="Polomski, E F" uniqKey="Polomski E" first="E. F." last="Polomski">E. F. Polomski</name><affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Department of Astronomy, University of Minnesota, 116 Church St. SE</s1><s2>Minneapolis MN 55455</s2><s3>USA</s3><sZ>10 aut.</sZ><sZ>11 aut.</sZ><sZ>12 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Minneapolis MN 55455</wicri:noRegion></affiliation></author><author><name sortKey="Fazio, G G" sort="Fazio, G G" uniqKey="Fazio G" first="G. G." last="Fazio">G. G. Fazio</name><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>Harvard-Smithsonian Center for Astrophysics, 60 Garden St</s1><s2>Cambridge, MA 02138</s2><s3>USA</s3><sZ>13 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Cambridge, MA 02138</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption band</term><term>Accretion</term><term>Age</term><term>Asymptotic giant branch</term><term>Carbon stars</term><term>Color</term><term>Galaxy evolution</term><term>Galaxy formation</term><term>Galaxy groups</term><term>Local group</term><term>Metallicity</term><term>Morphology</term><term>Polycyclic aromatic hydrocarbons</term><term>Red stars</term><term>Spectroscopy</term><term>Spiral arm</term><term>Spiral galaxies</term><term>Star formation</term><term>Stellar content</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Spectrométrie</term><term>Galaxies spirales</term><term>Bras spiral</term><term>Age</term><term>Etoile carbone</term><term>Branche géante asymptotique</term><term>Etoile rouge</term><term>Bande absorption</term><term>Hydrocarbure aromatique polycyclique</term><term>Morphologie</term><term>Couleur</term><term>Métallicité</term><term>Formation stellaire</term><term>Accrétion</term><term>Groupe galaxies</term><term>Groupe local</term><term>Formation galaxies</term><term>Contenu stellaire</term><term>Evolution galaxies</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Spectrométrie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In an earlier study of the spiral galaxy M 33, we photometrically identified arcs or outer spiral arms of intermediate age (0.6-2 Gyr) carbon stars precisely at the commencement of the HI-warp. Stars in the arcs were unresolved, but were likely thermally-pulsing asymptotic giant branch carbon stars. Here we present Keck I spectroscopy of seven intrinsically bright and red target stars in the outer, northern arc in M 33. The target stars have estimated visual magnitudes as faint as V ∼ 25<sup>m</sup>. Absorption bands of CN are seen in all seven spectra reported here, confirming their carbon star status. In addition, we present Keck II spectra of a small area 0.5 degree away from the centre of M 33; the target stars there are also identified as carbon stars. We also study the non-stellar PAH dust morphology of M 33 secured using IRAC on board the Spitzer Space Telescope. The Spitzer 8 μm image attests to a change of spiral phase at the start of the HI warp. The Keck spectra confirm that carbon stars may safely be identified on the basis of their red J - K<sub>s</sub> colours in the outer, low metallicity disk of M 33. We propose that the enhanced number of carbon stars in the outer arms are an indicator of recent star formation, fueled by gas accretion from the HI-warp reservoir.</div></front></TEI><affiliations><list><country><li>Afrique du Sud</li><li>Australie</li><li>France</li><li>Mexique</li><li>États-Unis</li></country><region><li>Hawaï</li><li>Île-de-France</li></region><settlement><li>Paris</li></settlement></list><tree><country name="Afrique du Sud"><noRegion><name sortKey="Block, D L" sort="Block, D L" uniqKey="Block D" first="D. L." last="Block">D. L. Block</name></noRegion><name sortKey="Groess, R" sort="Groess, R" uniqKey="Groess R" first="R." last="Groess">R. Groess</name></country><country name="Australie"><noRegion><name sortKey="Block, D L" sort="Block, D L" uniqKey="Block D" first="D. L." last="Block">D. L. Block</name></noRegion><name sortKey="Freeman, K C" sort="Freeman, K C" uniqKey="Freeman K" first="K. C." last="Freeman">K. C. Freeman</name></country><country name="France"><region name="Île-de-France"><name sortKey="Combes, F" sort="Combes, F" uniqKey="Combes F" first="F." last="Combes">F. Combes</name></region></country><country name="Mexique"><noRegion><name sortKey="Puerari, I" sort="Puerari, I" uniqKey="Puerari I" first="I." last="Puerari">I. Puerari</name></noRegion></country><country name="États-Unis"><region name="Hawaï"><name sortKey="Stockton, A" sort="Stockton, A" uniqKey="Stockton A" first="A." last="Stockton">A. Stockton</name></region><name sortKey="Canalizo, G" sort="Canalizo, G" uniqKey="Canalizo G" first="G." last="Canalizo">G. Canalizo</name><name sortKey="Fazio, G G" sort="Fazio, G G" uniqKey="Fazio G" first="G. G." last="Fazio">G. G. Fazio</name><name sortKey="Gehrz, R D" sort="Gehrz, R D" uniqKey="Gehrz R" first="R. D." last="Gehrz">R. D. Gehrz</name><name sortKey="Jarrett, T H" sort="Jarrett, T H" uniqKey="Jarrett T" first="T. H." last="Jarrett">T. H. Jarrett</name><name sortKey="Polomski, E F" sort="Polomski, E F" uniqKey="Polomski E" first="E. F." last="Polomski">E. F. Polomski</name><name sortKey="Woodward, C E" sort="Woodward, C E" uniqKey="Woodward C" first="C. E." last="Woodward">C. E. Woodward</name><name sortKey="Worthey, G" sort="Worthey, G" uniqKey="Worthey G" first="G." last="Worthey">G. Worthey</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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