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Measuring star formation with resolved observations: the test case of M 33

dc.contributor.authorBOQUIEN, M.,
hal.structure.identifierDepartment of Astronomy
dc.contributor.authorCALZETTI, D.,
dc.contributor.authorAALTO, S.,
hal.structure.identifierIstituto di Metodologie per l'Analisi Ambientale [IMAA]
dc.contributor.authorBOSELLI, A.,
hal.structure.identifierFORMATION STELLAIRE 2015
dc.contributor.authorBRAINE, J.
dc.contributor.authorBUAT, V.,
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
hal.structure.identifierCollège de France - Chaire Galaxies et cosmologie
dc.contributor.authorCOMBES, F.
dc.contributor.authorISRAEL, F.,
dc.contributor.authorKRAMER, C.,
hal.structure.identifierCalifornia Institute of Technology [CALTECH]
dc.contributor.authorLORD, S.,
hal.structure.identifierDpto. Fisica Teorica y del Cosmos
dc.contributor.authorRELAÑO, M.,
hal.structure.identifierUniversity of British Columbia [UBC]
dc.contributor.authorROSOLOWSKY, E.,
dc.contributor.authorSTACEY, G.,
dc.contributor.authorTABATABAEI, F.,
hal.structure.identifierSRON Netherlands Institute for Space Research [SRON]
dc.contributor.authorVAN DER TAK, F.,
hal.structure.identifierLeiden Observatory [Leiden]
dc.contributor.authorVAN DER WERF, P.,
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorVERLEY, S.,
dc.contributor.authorXILOURIS, M.,
dc.date.issued2015-06
dc.identifier.issn0004-6361
dc.description.abstractEnContext. Measuring star formation on a local scale is important to constrain star formation laws. It is not clear yet, however, whether and how the measure of star formation is affected by the spatial scale at which a galaxy is observed. Aims: We wish to understand the impact of the resolution on the determination of the spatially resolved star formation rate (SFR) and other directly associated physical parameters such as the attenuation. Methods: We carried out a multi-scale, pixel-by-pixel study of the nearby galaxy M 33. Assembling FUV, Hα, 8 μm, 24 μm, 70 μm, and 100 μm maps, we have systematically compared the emission in individual bands with various SFR estimators from a resolution of 33 pc to 2084 pc. Results: There are strong, scale-dependent, discrepancies of up to a factor 3 between monochromatic SFR estimators and Hα+24 μm. The scaling factors between individual IR bands and the SFR show a strong dependence on the spatial scale and on the intensity of star formation. Finally, strong variations of the differential reddening between the nebular emission and the stellar continuum are seen, depending on the specific SFR (sSFR) and on the resolution. At the finest spatial scales, there is little differential reddening at high sSFR. The differential reddening increases with decreasing sSFR. At the coarsest spatial scales the differential reddening is compatible with the canonical value found for starburst galaxies. Conclusions: Our results confirm that monochromatic estimators of the SFR are unreliable at scales smaller than 1 kpc. Furthermore, the extension of local calibrations to high-redshift galaxies presents non-trivial challenges because the properties of these systems may be poorly known.The maps (FITS files) and the data cube used in this article are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/578/A8
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.engalaxies: ISM
dc.subject.engalaxies: individual: M 33
dc.subject.engalaxies: star formation
dc.title.enMeasuring star formation with resolved observations: the test case of M 33
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201423518
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1502.01347
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA8
bordeaux.volume578
bordeaux.peerReviewedoui
hal.identifierhal-01116043
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01116043v1
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