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Dust properties in H II regions in M 33

hal.structure.identifierDpto. Fisica Teorica y del Cosmos
dc.contributor.authorRELAÑO, M.
dc.contributor.authorKENNICUTT, R.
hal.structure.identifierDepartamento Física Teórica y del Cosmos
dc.contributor.authorLISENFELD, U.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorVERLEY, S.
dc.contributor.authorHERMELO, I.
dc.contributor.authorBOQUIEN, M.
dc.contributor.authorALBRECHT, M.
hal.structure.identifierInstituto de RadioAstronomía Milimétrica [IRAM]
dc.contributor.authorKRAMER, C.
hal.structure.identifierFORMATION STELLAIRE 2016
dc.contributor.authorBRAINE, J.
dc.contributor.authorPÉREZ-MONTERO, E.
dc.contributor.authorDE LOOZE, I.
hal.structure.identifierInstitute for Astronomy, Astrophysics, Space Applications and Remote Sensing [Penteli] [IAASARS]
dc.contributor.authorXILOURIS, M.
hal.structure.identifierSchool of Physics and Astronomy [Minneapolis]
dc.contributor.authorKOVÁCS, A.
hal.structure.identifierAUTRES
dc.contributor.authorSTAGUHN, J.
dc.date.issued2016
dc.identifier.issn0004-6361
dc.description.abstractEnContext. The infrared emission (IR) of the interstellar dust has been claimed to be a tracer of the star formation rate. However, the conversion of the IR emission into star formation rate can be strongly dependent on the physical properties of the dust, which are affected by the environmental conditions where the dust is embedded. Aims: We study here the dust properties of a set of H ii regions in the Local Group galaxy M 33 presenting different spatial configurations between the stars, gas, and dust to understand the dust evolution in different environments. Methods: We modelled the spectral energy distribution (SED) of each region using the DustEM tool and obtained the mass relative to hydrogen for very small grains (VSG, YVSG), polycyclic aromatic hydrocarbons (YPAH), and big grains (BG, YBG). We furthermore performed a pixel-by-pixel SED modelling and derived maps of the relative mass of each grain type for the whole surface of the two most luminous H ii regions in M 33, NGC 604 and NGC 595. Results: The relative mass of the VSGs (YVSG/YTOTAL) changes with the morphology of the region: YVSG/YTOTAL is a factor of 1.7 higher for H ii regions classified as filled and mixed than for regions presenting a shell structure. The enhancement in VSGs within NGC 604 and NGC 595 is correlated to expansive gas structures with velocities ≥50 km s-1. The gas-to-dust ratio derived for the H ii regions in our sample exhibits two regimes related to the H i-H2 transition of the interstellar medium (ISM). Regions corresponding to the H i diffuse regime present a gas-to-dust ratio compatible with the expected value if we assume that the gas-to-dust ratio scales linearly with metallicity, while regions corresponding to a H2 molecular phase present a flatter dust-gas surface density distribution. Conclusions: The fraction of VSGs can be affected by the conditions of the interstellar environment: strong shocks of 50-90 km s-1 existing in the interior of the most luminous H ii regions can lead to fragmentation of BGs into smaller ones, while the more evolved shell and clear shell objects provide a more quiescent environment where reformation of dust BGs might occur. The gas-to-dust variations found in this analysis might imply that grain coagulation and/or gas-phase metal incorporation into the dust mass is occurring in the interior of the H ii regions in M 33.Full Tables A.1 and A.2 are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/595/A43
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.engalaxies: individual: M 33
dc.subject.engalaxies: ISM
dc.subject.enHiiregions
dc.subject.enISM: bubbles
dc.subject.endust
dc.subject.enextinction
dc.subject.eninfrared: ISM
dc.title.enDust properties in H II regions in M 33
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201628139
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A43
bordeaux.volume595
bordeaux.peerReviewedoui
hal.identifierhal-01391226
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01391226v1
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