https://scholars.lib.ntu.edu.tw/handle/123456789/624909
標題: | Dust Attenuation Curves at z ∼ 0.8 from LEGA-C: Precise Constraints on the Slope and 2175Å Bump Strength | 作者: | Barišić I Pacifici C Van Der Wel A Straatman C Bell E.F Bezanson R Brammer G D'Eugenio F Franx M Van Houdt J Maseda M.V Muzzin A Sobral D Wu P.-F. PO-FENG WU |
公開日期: | 2020 | 卷: | 903 | 期: | 2 | 來源出版物: | Astrophysical Journal | 摘要: | We present a novel approach to measure the attenuation curves of 485 individual star-forming galaxies with M∗ > 1010 Mo˙ based on deep optical spectra from the VLT/VIMOS LEGA-C survey and multiband photometry in the COSMOS field. Most importantly, we find that the attenuation curves in the rest-frame 3000-4500 Å range are typically almost twice as steep as the Milky Way, LMC, SMC, and Calzetti attenuation curves, which is in agreement with recent studies of the integrated light of present-day galaxies. The attenuation at 4500 Å and the slope strongly correlate with the galaxy inclination: face-on galaxies show less attenuation and steeper curves compared to edge-on galaxies, suggesting that geometric effects dominate observed variations in attenuation. Our new method produces 2175 Å UV bump detections for 260 individual galaxies. Even though obvious correlations between UV bump strength and global galaxy properties are absent, strong UV bumps are most often seen in face-on, lower-mass galaxies (10 < log10(M ∗/M o˙) < 10.5) with low overall attenuation. Finally, we produce a typical attenuation curve for star-forming galaxies at z ∼ 0.8; this prescription represents the effect of dust on the integrated spectral energy distributions of high-redshift galaxies more accurately than commonly used attenuation laws. © 2020. The American Astronomical Society. All rights reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096600527&doi=10.3847%2f1538-4357%2fabba37&partnerID=40&md5=bbac3041f11fb84f5fcde835b1c3c690 https://scholars.lib.ntu.edu.tw/handle/123456789/624909 |
ISSN: | 0004637X | DOI: | 10.3847/1538-4357/abba37 |
顯示於: | 天文物理研究所 |
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