The MOSDEF survey: the dependence of H α-to-UV SFR ratios on SFR and size at z ∼ 2
| العنوان: | The MOSDEF survey: the dependence of H α-to-UV SFR ratios on SFR and size at z ∼ 2 |
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| المؤلفون: | Gene C. K. Leung, Brian Siana, Naveen A. Reddy, William R. Freeman, Bahram Mobasher, Sedona H. Price, Tara Fetherolf, Tom Zick, Alison L. Coil, Mojegan Azadi, Laura de Groot, Alice E. Shapley, Irene Shivaei, Mariska Kriek, Ryan L. Sanders |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 508:1431-1445 |
| بيانات النشر: | Oxford University Press (OUP), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Physics, 010504 meteorology & atmospheric sciences, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, Redshift, Galaxy, Space and Planetary Science, 0103 physical sciences, Attenuation curve, Continuum (set theory), Emission spectrum, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences |
| الوصف: | We perform an aperture-matched analysis of dust-corrected H α and UV star formation rates (SFRs) using 303 star-forming galaxies with spectroscopic redshifts 1.36 < zspec < 2.66 from the MOSFIRE Deep Evolution Field survey. By combining H α and H β emission line measurements with multiwaveband resolved Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey/3D-HST imaging, we directly compare dust-corrected H α and UV SFRs, inferred assuming a fixed attenuation curve shape and constant SFHs, within the spectroscopic aperture. Previous studies have found that H α and UV SFRs inferred with these assumptions generally agree for typical star-forming galaxies, but become increasingly discrepant for galaxies with higher SFRs (≳100 M⊙ yr−1), with H α-to-UV SFR ratios being larger for these galaxies. Our analysis shows that this trend persists even after carefully accounting for the apertures over which H α and UV-based SFRs (and the nebular and stellar continuum reddening) are derived. Furthermore, our results imply that H α SFRs may be higher in the centres of large galaxies (i.e. where there is coverage by the spectroscopic aperture) compared to their outskirts, which could be indicative of inside-out galaxy growth. Overall, we suggest that the persistent difference between nebular and stellar continuum reddening and high H α-to-UV SFR ratios at the centres of large galaxies may be indicative of a patchier distribution of dust in galaxies with high SFRs. |
| تدمد: | 1365-2966 0035-8711 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::6878bc0b5b4da53ae182dc95cc295ad3 https://doi.org/10.1093/mnras/stab2570 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........6878bc0b5b4da53ae182dc95cc295ad3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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