AustralieFrV1, Main, Exploration, bibRecord, 009944

Mid‐infrared source multiplicity within hot molecular cores traced by methanol masers

Identifieur interne : 009944 ( Main/Exploration ); précédent : 009943; suivant : 009945

Mid‐infrared source multiplicity within hot molecular cores traced by methanol masers

Auteurs : S. N. Longmore [Australie] ; M. G. Burton [Australie] ; V. Minier [France] ; A. J. Walsh [Australie]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2006-07-01.

RBID : ISTEX:F0E64E3FE80B2556D1502E4673EC0901659354F5

Descripteurs français

Pascal (Inist)
- Couleur, Etoile IR, Etoile premier type, Fonction luminosité, Fonction masse, Fonction masse initiale, Formation stellaire, Luminosité, Maser, Masse stellaire, Multiplicité, Méthanol, Objet stellaire jeune, Source ponctuelle.
Wicri :
- topic : Méthanol.

English descriptors

Abstract

We present high resolution, mid‐infrared (MIR) images towards three hot molecular cores signposted by methanol maser emission: G173.49+2.42 (S231, S233IR), G188.95+0.89 (S252, AFGL‐5180) and G192.60−0.05 (S255IR). Each of the cores was targeted with Michelle on Gemini North using five filters from 7.9 to 18.5 μm. We find each contains both large regions of extended emission and multiple, luminous point sources which, from their extremely red colours (F18.5/F7.9≥ 3), appear to be embedded young stellar objects. The closest angular separations of the point sources in the three regions are 0.79, 1.00 and 3.33 arcsec corresponding to linear separations of 1700, 1800 and 6000 au, respectively. The methanol maser emission is found closest to the brightest MIR point source (within the assumed 1‐arcsec pointing accuracy). Mass and luminosity estimates for the sources range from 3 to 22 M⊙ and from 50 to 40 000 L⊙, respectively. Assuming the MIR sources are embedded objects and the observed gas mass provides the bulk of the reservoir from which the stars formed, it is difficult to generate the observed distributions for the most massive cluster members from the gas in the cores using a standard form of the initial mass function.

Url:

DOI: 10.1111/j.1365-2966.2006.10362.x

Affiliations:

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<term>Color</term>
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<term>Detection limit</term>
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<term>Mass estimate</term>
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<term>Massive stars</term>
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<term>Methanol maser emission</term>
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<term>Mnras</term>
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<term>Peak value</term>
<term>Point source</term>
<term>Point sources</term>
<term>Projection angle</term>
<term>Recent observations</term>
<term>Same distance</term>
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<term>Spatial distribution</term>
<term>Spatial resolution</term>
<term>Spectral energy distribution</term>
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<term>Standard stars</term>
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<term>Detection limit</term>
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<term>Maser</term>
<term>Mass distribution</term>
<term>Mass estimate</term>
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<term>Massive stars</term>
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<term>Methanol maser emission</term>
<term>Methanol masers</term>
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<front><div type="abstract" xml:lang="en">We present high resolution, mid‐infrared (MIR) images towards three hot molecular cores signposted by methanol maser emission: G173.49+2.42 (S231, S233IR), G188.95+0.89 (S252, AFGL‐5180) and G192.60−0.05 (S255IR). Each of the cores was targeted with Michelle on Gemini North using five filters from 7.9 to 18.5 μm. We find each contains both large regions of extended emission and multiple, luminous point sources which, from their extremely red colours (F18.5/F7.9≥ 3), appear to be embedded young stellar objects. The closest angular separations of the point sources in the three regions are 0.79, 1.00 and 3.33 arcsec corresponding to linear separations of 1700, 1800 and 6000 au, respectively. The methanol maser emission is found closest to the brightest MIR point source (within the assumed 1‐arcsec pointing accuracy). Mass and luminosity estimates for the sources range from 3 to 22 M⊙ and from 50 to 40 000 L⊙, respectively. Assuming the MIR sources are embedded objects and the observed gas mass provides the bulk of the reservoir from which the stars formed, it is difficult to generate the observed distributions for the most massive cluster members from the gas in the cores using a standard form of the initial mass function.</div>
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Serveur d'exploration sur les relations entre la France et l'Australie

Mid‐infrared source multiplicity within hot molecular cores traced by methanol masers

Mid‐infrared source multiplicity within hot molecular cores traced by methanol masers

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Descripteurs français

English descriptors

Abstract

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