Dust attenuation in z $\sim$ 1 galaxies from Herschel and 3D-HST H$α$ measurements

A. Puglisi; G. Rodighiero; A. Franceschini; M. Talia; A. Cimatti; I. Baronchelli; E. Daddi; A. Renzini; K. Schawinski; C. Mancini; J. Silverman; C. Gruppioni; D. Lutz; S. Berta; S. J. Oliver

doi:10.1051/0004-6361/201526782

paper

Dust attenuation in z $\sim$ 1 galaxies from Herschel and 3D-HST H $α$ measurements

arXiv:1507.00005 · doi:10.1051/0004-6361/201526782

Abstract

We combined the spectroscopic information from the 3D-HST survey with \textit{Herschel} data to characterize the H $α$ dust attenuation properties of a sample of 79 main sequence star-forming galaxies at $z \sim 1$ in the GOODS-S field. The sample was selected in the far-IR, at $λ$ =100 and/or 160 $μ$ m, and only includes galaxies with a secure H $α$ detection (S/N $>$ 3). From the low resolution 3D-HST spectra we measured the redshifts and the H $α$ fluxes for the whole sample (a factor of 1/1.2 was applied to the observed fluxes to remove the [NII] contamination). The stellar masses (M $_{⋆}$ ), infrared (L $_{I R}$ ) and UV luminosities (L $_{U V}$ ) were derived from the SEDs by fitting multi-band data from GALEX near-UV to SPIRE 500 $μ$ m. We estimated the continuum extinction E $_{s t a r}$ (B-V) from both the IRX=L $_{I R}$ /L $_{U V}$ ratio and the UV-slope, $β$ , and found an excellent agreement between the two. The nebular extinction was estimated from comparison of the observed SFR $_{H α}$ and SFR $_{U V}$ . We obtained \emph{f}=E $_{s t a r}$ (B-V)/E $_{n e b}$ (B-V)=0.93 $\pm$ 0.06, i.e. higher than the canonical value of \emph{f}=0.44 measured in the local Universe. Our derived dust correction produces good agreement between the H $α$ and IR+UV SFRs for galaxies with SFR $≳$ 20 M $_{⊙}$ /yr and M $_{⋆} ≳ 5 \times 1 0^{10}$ M $_{⊙}$ , while objects with lower SFR and M $_{⋆}$ seem to require a smaller \emph{f}-factor (i.e. higher H $α$ extinction correction). Our results then imply that the nebular extinction for our sample is comparable to that in the optical-UV continuum and suggest that the \emph{f}-factor is a function of both M $_{⋆}$ and SFR, in agreement with previous studies.

19 pages, 17 figures. Accepted for publication in A&A

Dust attenuation in z $\sim$ 1 galaxies from Herschel and 3D-HST H $α$ measurements

Abstract

References in corpus (15)

Cited by in corpus (50)

Dust attenuation in z ∼ 1 galaxies from Herschel and 3D-HST Hα measurements

Abstract

References in corpus (15)

Cited by in corpus (50)

Dust attenuation in z $\sim$ 1 galaxies from Herschel and 3D-HST H $α$ measurements