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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660833.0, MPI für Astronomie / Publikationen_mpia
Estimating the star formation rate at 1 kpc scales in nearby galaxies
Authors:Leroy, A. K.; Bigiel, F.; de Blok, W. J. G.; Boissier, S.; Bolatto, A.; Brinks, E.; Madore, B.; Munoz-Mateos, J.-C.; Murphy, E.; Sandstrom, K.; Schruba, A.; Walter, F.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astronomical Journal
Issue / Number:1
Start Page:id. 3
Audience:Not Specified
Abstract / Description:Using combinations of Hα, ultraviolet (UV), and infrared (IR) emission, we estimate the star formation rate (SFR) surface density, ΣSFR, at 1 kpc resolution for 30 disk galaxies that are targets of the IRAM HERACLES CO survey. We present a new physically motivated IR spectral-energy-distribution-based approach to account for possible contributions to 24 μm emission not associated with recent star formation. Considering a variety of "reference" SFRs from the literature, we revisit the calibration of the 24 μm term in hybrid (UV+IR or Hα+IR) tracers. We show that the overall calibration of this term remains uncertain at the factor of two level because of the lack of wide-field, robust reference SFR estimates. Within this uncertainty, published calibrations represent a reasonable starting point for 1 kpc-wide areas of star-forming disk galaxies, but we re-derive and refine the calibration of the IR term in these tracers to match our resolution and approach to 24 μm emission. We compare a large suite of ΣSFR estimates and find that above ΣSFR ~ 10-3 M &sun; yr-1 kpc-2 the systematic differences among tracers are less than a factor of two across two orders of magnitude dynamic range. We caution that methodology and data both become serious issues below this level. We note from simple model considerations that when focusing on a part of a galaxy dominated by a single stellar population, the intrinsic uncertainty in Hα- and FUV-based SFRs is ~0.3 and ~0.5 dex.
Free Keywords:galaxies: ISM; galaxies: spiral; infrared: galaxies; stars: formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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