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The Heating of Mid-Infrared Dust in the Nearby Galaxy M33: A Testbed for Tracing Galaxy Evolution

hal.structure.identifierDepartment of Astronomy [Amherst]
dc.contributor.authorCALAPA, M.
hal.structure.identifierDepartment of Astronomy [Amherst]
dc.contributor.authorCALZETTI, D.
hal.structure.identifierPrinceton University
dc.contributor.authorDRAINE, B. T.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorBOQUIEN, Médéric
dc.contributor.authorKRAMER, C.
dc.contributor.authorXILOURIS, M.
hal.structure.identifierDept. fısica Teorica y del Cosmos
dc.contributor.authorVERLEY, S.
hal.structure.identifierFORMATION STELLAIRE 2014
dc.contributor.authorBRAINE, Jonathan
hal.structure.identifierDept. fısica Teorica y del Cosmos
dc.contributor.authorRELAÑO-PASTOR, M.
hal.structure.identifierLeiden Observatory [Leiden]
dc.contributor.authorVAN DER WERF, P.
hal.structure.identifierLeiden Observatory [Leiden]
dc.contributor.authorISRAEL, F.
hal.structure.identifierDept. fısica Teorica y del Cosmos
dc.contributor.authorHERMELO, I.
hal.structure.identifierArgelander-Institut für Astronomie [AlfA]
dc.contributor.authorALBRECHT, M.
dc.date.created2014-02-19
dc.date.issued2014
dc.identifier.issn0004-637X
dc.description.abstractEnBecause the 8 {\mu}m polycyclic aromatic hydrocarbon (PAH) emission has been found to correlate with other well-known star formation tracers, it has widely been used as a star formation rate (SFR) tracer. There are, however, studies that challenge the accuracy and reliability of the 8 {\mu}m emission as a SFR tracer. Our study, part of the Herschel M33 Extended Survey (HERM33ES) open time key program, aims at addressing this issue by analyzing the infrared emission from the nearby spiral galaxy M33 at the high spatial scale of 75 pc. Combining data from the Herschel Space Observatory and the Spitzer Space Telescope we find that the 8 {\mu}m emission is better correlated with the 250 {\mu}m emission, which traces cold interstellar gas, than with the 24 {\mu}m emission. The L(8)/L(24) ratio is highly depressed in 24 {\mu}m luminous regions, which correlate with known HII regions. We also compare our results with the dust emission models by Draine & Li (2007). We confirm that the depression of 8 {\mu}m PAH emission near star-forming regions is higher than what is predicted by models; this is possibly an effect of increased stellar radiation from young stars destroying the dust grains responsible for the 8 {\mu}m emission as already suggested by other authors. We find that the majority of the 8 {\mu}m emission is fully consistent with heating by the diffuse interstellar medium, similar to what recently determined for the dust emission in M31 by Draine at al. (2013). We also find that the fraction of 8 {\mu}m emission associated with the diffuse interstellar radiation field ranges between 60% and 80% and is 40% larger than the diffuse fraction at 24 {\mu}m.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.title.enThe Heating of Mid-Infrared Dust in the Nearby Galaxy M33: A Testbed for Tracing Galaxy Evolution
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/784/2/130
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1402.4668
bordeaux.journalThe Astrophysical Journal
bordeaux.page130
bordeaux.volume784
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00951144
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00951144v1
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