Calibrating Star Formation Rate Prescriptions at Different Scales (10 pc-1 kpc) in M31

Article


Tomičić, Neven, Ho, I. -Ting, Kreckel, Kathryn, Schinnerer, Eva, Leroy, Adam, Groves, Brent, Sandstrom, Karin, Blanc, Guillermo A., Jarrett, Thomas, Thilker, David, Kapala, Maria and McElroy, Rebecca. 2019. "Calibrating Star Formation Rate Prescriptions at Different Scales (10 pc-1 kpc) in M31." The Astrophysical Journal: an international review of astronomy and astronomical physics. 873 (1). https://doi.org/10.3847/1538-4357/ab03ce
Article Title

Calibrating Star Formation Rate Prescriptions at Different Scales (10 pc-1 kpc) in M31

ERA Journal ID1057
Article CategoryArticle
AuthorsTomičić, Neven, Ho, I. -Ting, Kreckel, Kathryn, Schinnerer, Eva, Leroy, Adam, Groves, Brent, Sandstrom, Karin, Blanc, Guillermo A., Jarrett, Thomas, Thilker, David, Kapala, Maria and McElroy, Rebecca
Journal TitleThe Astrophysical Journal: an international review of astronomy and astronomical physics
Journal Citation873 (1)
Article Number3
Number of Pages26
Year2019
PublisherIOP Publishing
Place of PublicationUnited States
ISSN0004-637X
1538-4357
Digital Object Identifier (DOI)https://doi.org/10.3847/1538-4357/ab03ce
Web Address (URL)https://iopscience.iop.org/article/10.3847/1538-4357/ab03ce
AbstractWe calibrate commonly used star formation rate (SFR) prescriptions using observations in five kiloparsec-sized fields in the nearby galaxy Andromeda (M31) at 10 pc spatial resolution. Our observations at different scales enable us to resolve the star-forming regions and to distinguish them from non-star-forming components. We use extinction-corrected Hα from optical integral field spectroscopy as our reference tracer and have verified its reliability via tests. It is used to calibrate monochromatic and hybrid (Hα+a×IR and far-UV+b×IR) SFR prescriptions, which use far-UV (GALEX), 22 μm (Wide-field Infrared Survey Explorer), and 24 μm (MIPS). Additionally, we evaluate other multiwavelength infrared tracers. Our results indicate that the SFR prescriptions do not change (in M31) with spatial scales or with subtraction of the diffuse component. For the calibration factors in the hybrid SFR prescriptions, we find a ≈ 0.2 and b ≈ 22 in M31, which are a factor of 5 higher than in the literature. As the fields in M31 exhibit high attenuation and low dust temperatures, lie at large galactocentric distances, and suffer from high galactic inclination compared to measurements in other galaxies, we propose that the fields probe a dust layer extended along the line of sight that is not directly spatially associated with star-forming regions. This (vertically) extended dust component increases the attenuation and alters the SFR prescriptions in M31 compared to literature measurements. We recommend that SFR prescriptions should be applied with caution at large galactocentric distances and in highly inclined galaxies, due to variations in the relative (vertical) distribution of dust and gas.
Keywordsgalaxies: star formation; ISM: general; galaxies: individual; HII regions
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510102. Astronomical instrumentation
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Byline AffiliationsMax Planck Institute for Astronomy, Germany
Ohio State University, United States
Australian National University
University of California San Diego, United States
Carnegie Institution for Science, United States
University of Cape Town, South Africa
Johns Hopkins University, United States
School of Mathematics, Physics and Computing
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