DUST EXTINCTION FROM BALMER DECREMENTS OF STAR-FORMING GALAXIES AT 0.75 ⩽ z ⩽ 1.5 WITH HUBBLE SPACE TELESCOPE/WIDE-FIELD-CAMERA 3 SPECTROSCOPY FROM THE WFC3 INFRARED SPECTROSCOPIC PARALLEL SURVEY

By A. Domínguez, B. Siana, A. Henry, Claudia Scarlata, A. Bedregal, M. Malkan, H. Atek, N. Ross, J. Colbert, H. Teplitz and 7 more. 2012

138 citations recorded by the source corpus.

Spectroscopic observations of Hα and Hβ emission lines of 128 star-forming galaxies in the redshift range 0.75 ⩽ z ⩽ 1.5 are presented. These data were taken with slitless spectroscopy using the G102 and G141 grisms of the Wide-Field-Camera 3 (WFC3) on board the Hubble Space Telescope as part of the WFC3 Infrared Spectroscopic Parallel survey. Interstellar dust extinction is measured from stacked spectra that cover the Balmer decrement (Hα/Hβ). We present dust extinction as a function of Hα luminosity (down to 3 × 1041 erg s−1), galaxy stellar mass (reaching 4 × 108 M☉), and rest-frame Hα equivalent width. The faintest galaxies are two times fainter in Hα luminosity than galaxies previously studied at z ∼ 1.5. An evolution is observed where galaxies of the same Hα luminosity have lower extinction at higher redshifts, whereas no evolution is found within our error bars with stellar mass. The lower Hα luminosity galaxies in our sample are found to be consistent with no dust extinction. We find an anti-correlation of the [O iii] λ5007/Hα flux ratio as a function of luminosity where galaxies with LHα < 5 × 1041 erg s−1 are brighter in [O iii] λ5007 than Hα. This trend is evident even after extinction correction, suggesting that the increased [O iii] λ5007/Hα ratio in low-luminosity galaxies is likely due to lower metallicity and/or higher ionization parameters.

Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Instrumentation

View Paper: https://www.semanticscholar.org/paper/571a0e3ed41ec4429a11bf1689e23a742107db63

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In Astronomy and Astrophysics

1. D. Elbaz
2. D. M. Alexander
3. Mark Dickinson
4. E. Daddi
5. M. B'ethermin
6. A. Renzini
7. G. Magdis
8. H. Aussel

In Electrical and Electronic Engineering

1. R. Ivison
2. A. Renzini

In Instrumentation

1. Mark Dickinson
2. D. Elbaz
3. A. Renzini
4. D. M. Alexander
5. M. B'ethermin
6. É. Le Floc'h
7. E. Daddi
8. H. Aussel

Citations in the corpus

• GOODS-HERSCHEL: STAR FORMATION, DUST ATTENUATION, AND THE FIR–RADIO CORRELATION ON THE MAIN SEQUENCE OF STAR-FORMING GALAXIES UP TO z ≃ 4 (2014, methodology): “…respectively, while we use the same Calzetti et al. (2000) extinction curve for both emissions. the redshift evolution, at least up toz ≃1.5, of theAHα–logM∗ relation (e.g., Sobral et al. 2012; Domínguez et al. 2013; Ibar et al. 2013; Kashino et al. 2013; Momcheva et al. 2013; Price et al. 2014).”