AustralieFrV1, Main, Exploration, bibRecord, 005868

THE RECENT STELLAR ARCHEOLOGY OF M31-THE NEAREST RED DISK GALAXY

Identifieur interne : 005868 ( Main/Exploration ); précédent : 005867; suivant : 005869

THE RECENT STELLAR ARCHEOLOGY OF M31-THE NEAREST RED DISK GALAXY

Auteurs : T. J. Davidge [Canada] ; A. W. Mcconnachie [Canada] ; M. A. Fardal [États-Unis] ; J. Fliri [France] ; D. Valls-Gabaud [France] ; S. C. Chapman [Royaume-Uni] ; G. F. Lewis [Australie] ; R. M. Rich [États-Unis]

Source :

The Astrophysical journal [ 0004-637X ] ; 2012.

RBID : Pascal:12-0349047

Descripteurs français

Pascal (Inist)
- Galaxies disques, Fonction luminosité, Etoile séquence principale, Modèle, Formation stellaire, Taux formation, Activité stellaire, Age, Structure stellaire, Galaxies spirales, Moment cinétique orbital, Nuage moléculaire géant, Etoile rouge, Etoile Be, Evolution galaxies.

English descriptors

KwdEn :
- Age, Be stars, Disk galaxies, Formation rate, Galaxy evolution, Giant molecular cloud, Luminosity function, Main sequence stars, Models, Orbital angular momentum, Red stars, Spiral galaxies, Star formation, Stellar activity, Stellar structure.

Abstract

We examine the star-forming history of the M31 disk during the past few hundred Myr. The luminosity functions (LFs) of main-sequence stars at distances R_GC > 21 kpc (i.e., >4 disk scale lengths) are matched by models that assume a constant star formation rate (SFR). However, at smaller R_GC the LFs suggest that during the past ∼10 Myr the SFR was 2-3 times higher than during the preceding ∼100 Myr. The rings of cool gas that harbor a significant fraction of the current star-forming activity are traced by stars with ages ∼100 Myr, indicating that (1) these structures have ages of at least 100 Myr and (2) stars in these structures do not follow the same relation between age and random velocity as their counterparts throughout the disks of other spiral galaxies, probably due to the inherently narrow orbital angular momentum distribution of the giant molecular clouds in these structures. The distribution of evolved red stars is not azimuthally symmetric, in the sense that the projected density along the northeast segment of the major axis is roughly twice that on the opposite side of the galaxy. The northeast arm of the major axis thus appears to be a fossil star-forming area that dates to intermediate epochs. Such a structure may be the consequence of interactions with a companion galaxy.

Affiliations:

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Le document en format XML

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<author><name sortKey="Fliri, J" sort="Fliri, J" uniqKey="Fliri J" first="J." last="Fliri">J. Fliri</name>
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<author><name sortKey="Valls Gabaud, D" sort="Valls Gabaud, D" uniqKey="Valls Gabaud D" first="D." last="Valls-Gabaud">D. Valls-Gabaud</name>
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<wicri:noRegion>75014 Paris</wicri:noRegion>
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<author><name sortKey="Chapman, S C" sort="Chapman, S C" uniqKey="Chapman S" first="S. C." last="Chapman">S. C. Chapman</name>
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<wicri:noRegion>Cambridge CB3 0HA</wicri:noRegion>
<orgName type="university">Université de Cambridge</orgName>
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<region type="région" nuts="1">Angleterre de l'Est</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Lewis, G F" sort="Lewis, G F" uniqKey="Lewis G" first="G. F." last="Lewis">G. F. Lewis</name>
<affiliation wicri:level="4"><inist:fA14 i1="05"><s1>Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney</s1>
<s2>NSW 2006</s2>
<s3>AUS</s3>
<sZ>7 aut.</sZ>
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<country>Australie</country>
<placeName><settlement type="city">Sydney</settlement>
<region type="état">Nouvelle-Galles du Sud</region>
</placeName>
<orgName type="university">Université de Sydney</orgName>
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<author><name sortKey="Rich, R M" sort="Rich, R M" uniqKey="Rich R" first="R. M." last="Rich">R. M. Rich</name>
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<idno type="ISSN">0004-637X</idno>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Age</term>
<term>Be stars</term>
<term>Disk galaxies</term>
<term>Formation rate</term>
<term>Galaxy evolution</term>
<term>Giant molecular cloud</term>
<term>Luminosity function</term>
<term>Main sequence stars</term>
<term>Models</term>
<term>Orbital angular momentum</term>
<term>Red stars</term>
<term>Spiral galaxies</term>
<term>Star formation</term>
<term>Stellar activity</term>
<term>Stellar structure</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Galaxies disques</term>
<term>Fonction luminosité</term>
<term>Etoile séquence principale</term>
<term>Modèle</term>
<term>Formation stellaire</term>
<term>Taux formation</term>
<term>Activité stellaire</term>
<term>Age</term>
<term>Structure stellaire</term>
<term>Galaxies spirales</term>
<term>Moment cinétique orbital</term>
<term>Nuage moléculaire géant</term>
<term>Etoile rouge</term>
<term>Etoile Be</term>
<term>Evolution galaxies</term>
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</teiHeader>
<front><div type="abstract" xml:lang="en">We examine the star-forming history of the M31 disk during the past few hundred Myr. The luminosity functions (LFs) of main-sequence stars at distances R<sub>GC</sub>
 > 21 kpc (i.e., >4 disk scale lengths) are matched by models that assume a constant star formation rate (SFR). However, at smaller R<sub>GC</sub>
 the LFs suggest that during the past ∼10 Myr the SFR was 2-3 times higher than during the preceding ∼100 Myr. The rings of cool gas that harbor a significant fraction of the current star-forming activity are traced by stars with ages ∼100 Myr, indicating that (1) these structures have ages of at least 100 Myr and (2) stars in these structures do not follow the same relation between age and random velocity as their counterparts throughout the disks of other spiral galaxies, probably due to the inherently narrow orbital angular momentum distribution of the giant molecular clouds in these structures. The distribution of evolved red stars is not azimuthally symmetric, in the sense that the projected density along the northeast segment of the major axis is roughly twice that on the opposite side of the galaxy. The northeast arm of the major axis thus appears to be a fossil star-forming area that dates to intermediate epochs. Such a structure may be the consequence of interactions with a companion galaxy.</div>
</front>
</TEI>
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<tree><country name="Canada"><noRegion><name sortKey="Davidge, T J" sort="Davidge, T J" uniqKey="Davidge T" first="T. J." last="Davidge">T. J. Davidge</name>
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<country name="États-Unis"><region name="Massachusetts"><name sortKey="Fardal, M A" sort="Fardal, M A" uniqKey="Fardal M" first="M. A." last="Fardal">M. A. Fardal</name>
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<name sortKey="Rich, R M" sort="Rich, R M" uniqKey="Rich R" first="R. M." last="Rich">R. M. Rich</name>
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<country name="France"><region name="Île-de-France"><name sortKey="Fliri, J" sort="Fliri, J" uniqKey="Fliri J" first="J." last="Fliri">J. Fliri</name>
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<name sortKey="Valls Gabaud, D" sort="Valls Gabaud, D" uniqKey="Valls Gabaud D" first="D." last="Valls-Gabaud">D. Valls-Gabaud</name>
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<country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Chapman, S C" sort="Chapman, S C" uniqKey="Chapman S" first="S. C." last="Chapman">S. C. Chapman</name>
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<country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Lewis, G F" sort="Lewis, G F" uniqKey="Lewis G" first="G. F." last="Lewis">G. F. Lewis</name>
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THE RECENT STELLAR ARCHEOLOGY OF M31-THE NEAREST RED DISK GALAXY

THE RECENT STELLAR ARCHEOLOGY OF M31-THE NEAREST RED DISK GALAXY

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri