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

Boquien, M. and Calzetti, D. and Aalto, S. and Boselli, A. and Braine, J. and Buat, V. and Combes, F. and Israel, F. and Kramer, C. and Lord, S. and Relaño, M. and Rosolowsky, E. and Stacey, G. and Tabatabaei, F. and van der Tak, F. and van der Werf, P. and Verley, S. and Xilouris, M. (2015) Measuring star formation with resolved observations: the test case of M 33. Astronomy and Astrophysics, 578 . Art. No. A8. ISSN 0004-6361. http://resolver.caltech.edu/CaltechAUTHORS:20150811-102156779

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Abstract

Context. 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361/201423518DOIArticle
http://www.aanda.org/articles/aa/abs/2015/06/aa23518-14/aa23518-14.htmlPublisherArticle
http://arxiv.org/abs/1502.01347arXivDiscussion Paper
ORCID:
AuthorORCID
Calzetti, D.0000-0002-5189-8004
van der Werf, P.0000-0001-5434-5942
Additional Information:© 2015 ESO. Article published by EDP Sciences. Received 28 January 2014; Accepted 4 February 2015; Published online 22 May 2015. M.B. thanks Robert Kennicutt, Kathryn Kreckel, Yiming Li, and Vivienne Wild for useful discussions that have helped improve the paper. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013). This research made use of APLpy, an open-source plotting package for Python hosted at http://aplpy.github.com.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:galaxies: individual: M 33 – galaxies: ISM – galaxies: star formation
Record Number:CaltechAUTHORS:20150811-102156779
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150811-102156779
Official Citation:M. Boquien, D. Calzetti, S. Aalto, A. Boselli, J. Braine, V. Buat, F. Combes, F. Israel, C. Kramer, S. Lord, M. Relaño, E. Rosolowsky, G. Stacey, F. Tabatabaei, F. van der Tak, P. van der Werf, S. Verley and M. Xilouris A&A 578 A8 (2015) DOI: http://dx.doi.org/10.1051/0004-6361/201423518
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59389
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Aug 2015 17:58
Last Modified:18 Aug 2017 00:12

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