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 |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | 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 |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 873 (1) |
Article Number | 3 |
Number of Pages | 26 |
Year | 2019 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
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 |
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 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. |
Keywords | galaxies: star formation; ISM: general; galaxies: individual; HII regions |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510102. Astronomical instrumentation |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions, but may be accessed online. Please see the link in the URL field. |
Byline Affiliations | Max 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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