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Dust attenuation curves at z ∼ 0.8 from LEGA-C : precise constraints on the slope and 2175 angstrom bump strength

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Abstract
We present a novel approach to measure the attenuation curves of 485 individual star-forming galaxies with M-* > 10(10) M-circle dot 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 angstrom 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 angstrom 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 angstrom 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 < log(10)(M-*/M-circle dot) < 10.5) with low overall attenuation. Finally, we produce a typical attenuation curve for star-forming galaxies at z similar to 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.
Keywords
Space and Planetary Science, Astronomy and Astrophysics, Interstellar dust extinction, STAR-FORMING GALAXIES, ULTRAVIOLET EXTINCTION CURVES, SPECTRAL ENERGY-DISTRIBUTION, INTERSTELLAR EXTINCTION, INSIGHTS, SHAPES, PHOTOMETRY, SCATTERING, STARLIGHT, EVOLUTION

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MLA
Barišić, Ivana, et al. “Dust Attenuation Curves at z ∼ 0.8 from LEGA-C : Precise Constraints on the Slope and 2175 Angstrom Bump Strength.” ASTROPHYSICAL JOURNAL, vol. 903, no. 2, 2020, doi:10.3847/1538-4357/abba37.
APA
Barišić, I., Pacifici, C., van der Wel, A., Straatman, C., Bell, E. F., Bezanson, R., … Wu, P.-F. (2020). Dust attenuation curves at z ∼ 0.8 from LEGA-C : precise constraints on the slope and 2175 angstrom bump strength. ASTROPHYSICAL JOURNAL, 903(2). https://doi.org/10.3847/1538-4357/abba37
Chicago author-date
Barišić, Ivana, Camilla Pacifici, Arjen van der Wel, Caroline Straatman, Eric F. Bell, Rachel Bezanson, Gabriel Brammer, et al. 2020. “Dust Attenuation Curves at z ∼ 0.8 from LEGA-C : Precise Constraints on the Slope and 2175 Angstrom Bump Strength.” ASTROPHYSICAL JOURNAL 903 (2). https://doi.org/10.3847/1538-4357/abba37.
Chicago author-date (all authors)
Barišić, Ivana, Camilla Pacifici, Arjen van der Wel, Caroline Straatman, Eric F. Bell, Rachel Bezanson, Gabriel Brammer, Francesco D’Eugenio, Marijn Franx, Josha van Houdt, Michael V. Maseda, Adam Muzzin, David Sobral, and Po-Feng Wu. 2020. “Dust Attenuation Curves at z ∼ 0.8 from LEGA-C : Precise Constraints on the Slope and 2175 Angstrom Bump Strength.” ASTROPHYSICAL JOURNAL 903 (2). doi:10.3847/1538-4357/abba37.
Vancouver
1.
Barišić I, Pacifici C, van der Wel A, Straatman C, Bell EF, Bezanson R, et al. Dust attenuation curves at z ∼ 0.8 from LEGA-C : precise constraints on the slope and 2175 angstrom bump strength. ASTROPHYSICAL JOURNAL. 2020;903(2).
IEEE
[1]
I. Barišić et al., “Dust attenuation curves at z ∼ 0.8 from LEGA-C : precise constraints on the slope and 2175 angstrom bump strength,” ASTROPHYSICAL JOURNAL, vol. 903, no. 2, 2020.
@article{8700718,
  abstract     = {{We present a novel approach to measure the attenuation curves of 485 individual star-forming galaxies with M-* > 10(10) M-circle dot 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 angstrom 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 angstrom 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 angstrom 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 < log(10)(M-*/M-circle dot) < 10.5) with low overall attenuation. Finally, we produce a typical attenuation curve for star-forming galaxies at z similar to 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.}},
  articleno    = {{146}},
  author       = {{Barišić, Ivana and Pacifici, Camilla and van der Wel, Arjen and Straatman, Caroline and Bell, Eric F. and Bezanson, Rachel and Brammer, Gabriel and D'Eugenio, Francesco and Franx, Marijn and van Houdt, Josha and Maseda, Michael V. and Muzzin, Adam and Sobral, David and Wu, Po-Feng}},
  issn         = {{1538-4357}},
  journal      = {{ASTROPHYSICAL JOURNAL}},
  keywords     = {{Space and Planetary Science,Astronomy and Astrophysics,Interstellar dust extinction,STAR-FORMING GALAXIES,ULTRAVIOLET EXTINCTION CURVES,SPECTRAL ENERGY-DISTRIBUTION,INTERSTELLAR EXTINCTION,INSIGHTS,SHAPES,PHOTOMETRY,SCATTERING,STARLIGHT,EVOLUTION}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{15}},
  title        = {{Dust attenuation curves at z ∼ 0.8 from LEGA-C : precise constraints on the slope and 2175 angstrom bump strength}},
  url          = {{http://dx.doi.org/10.3847/1538-4357/abba37}},
  volume       = {{903}},
  year         = {{2020}},
}

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