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

Tomičiƒá, N., Ho, I.-.-T., Kreckel, K., Schinnerer, E., Leroy, A., Groves, B., et al. (2019). Calibrating Star Formation Rate Prescriptions at Different Scales (10 pc-1 kpc) in M31. The Astrophysical Journal, 873.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CF92-D Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CF93-C
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019ApJ...873....3T (Any fulltext)
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 Creators:
Tomičiƒá, Neven1, Author
Ho, I. -Ting1, Author
Kreckel, Kathryn1, Author
Schinnerer, Eva1, Author
Leroy, Adam1, Author
Groves, Brent1, Author
Sandstrom, Karin1, Author
Blanc, Guillermo A.1, Author
Jarrett, Thomas1, Author
Thilker, David1, Author
Kapala, Maria1, Author
McElroy, Rebecca1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: star formation Hii regions galaxies: individual: M31 ISM: general Astrophysics - Astrophysics of Galaxies
 Abstract: We 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 HŒ± from optical integral field spectroscopy as our reference tracer and have verified its reliability via tests. It is used to calibrate monochromatic and hybrid (HŒ±+a IR and far-UV+b IR) SFR prescriptions, which use far-UV (GALEX), 22 Œºm (Wide-field Infrared Survey Explorer), and 24 Œºm (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 ‚âà 0.2 and b ‚âà 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.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 873 Sequence Number: - Start / End Page: - Identifier: -