THORNLEY, M. D.; BRAINE, J.; GARDAN, E.

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THORNLEY, M. D.
Department of Physics and Astronomy [Lewisburg]

BRAINE, J.
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

GARDAN, E.
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

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Article de revue

Ce document a été publié dans

The Astrophysical journal letters. 2006, vol. 651-2, p. L101–L105

Bristol : IOP Publishing

Résumé en anglais

We examine faint infrared emission features detected in Spitzer Space Telescope images of M51, which are associated with atomic hydrogen in the outer disk and tidal tail at R greater than R_25 (4.9', ~14 kpc at d=9.6 Mpc). The infrared colors of these features are consistent with the colors of dust associated with star formation in the bright disk. However, the star formation efficiency (as a ratio of star formation rate to neutral gas mass) implied in the outer disk is lower than that in the bright disk of M51 by an order of magnitude, assuming a similar relationship between infrared emission and star formation rate in the inner and outer disks.< Réduire

Mots clés en anglais

galaxies:individual(M51

NGC 5194)—galaxies:spiral—galaxies:ISM— galaxies:structure—infrared:galaxies

Origine

Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804