2016A&A...586A..83P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST16:41:00

2016A&A...586A..83P - Astronomy and Astrophysics, volume 586A, 83-83 (2016/2-1)

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

PUGLISI A., RODIGHIERO G., FRANCESCHINI A., TALIA M., CIMATTI A., BARONCHELLI I., DADDI E., RENZINI A., SCHAWINSKI K., MANCINI C., SILVERMAN J., GRUPPIONI C., LUTZ D., BERTA S. and OLIVER S.J.

Abstract (from CDS):

We combined the spectroscopic information from the 3D-HST survey with Herschel data to characterize the Hα dust attenuation properties of a sample of 79 main sequence star-forming galaxies at z ∼1 in the GOODS-S field. The sample was selected in the far-IR at λ=100 and/or 160µm and only includes galaxies with a secure Hα detection (S/N>3). From the low resolution 3D-HST spectra we measured the redshifts and the Hα 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 (LIR), and UV luminosities (LUV) were derived from the spectral energy distributions by fitting multiband data from GALEX near-UV to SPIRE 500µm. We estimated the continuum extinction Estar(B-V) from both the IRX=LIR/LUV ratio and the UV-slope, β, and found excellent agreement between the two. The nebular extinction was estimated from comparison of the observed SFR and SFRUV. We obtained f=Estar(B-V)/Eneb(B-V)=0.93±0.06, which is higher than the canonical value of f=0.44 measured in the local Universe. Our derived dust correction produces good agreement between the Hα and IR+UV SFRs for galaxies with SFR≳20M/yr and M*≳5x1010 M, while objects with lower SFR and M* seem to require a smaller f-factor (i.e. higher Hα extinction correction). Our results then imply that the nebular extinction for our sample is comparable to extinction in the optical-UV continuum and suggest that the f-factor is a function of both M* and SFR, in agreement with previous studies.

Abstract Copyright:

Journal keyword(s): galaxies: star formation - galaxies: high-redshift - dust, extinction - infrared: ISM

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1052 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
3 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2068 0
4 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 41 0
5 NAME Local Group GrG ~ ~           ~ 6971 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-16:41:00

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