Details

Autor(en) / Beteiligte

• Nelson, Erica June
• Dokkum, Pieter G. van
• Momcheva, Ivelina G.
• Brammer, Gabriel B.
• Wuyts, Stijn
• Franx, Marijn
• Schreiber, Natascha M. Förster
• Whitaker, Katherine E.
• Skelton, Rosalind E.

Titel

SPATIALLY RESOLVED DUST MAPS FROM BALMER DECREMENTS IN GALAXIES AT z ∼ 1.4

Ist Teil von

• Astrophysical journal. Letters, 2016-01, Vol.817 (1), p.1-6

Ort / Verlag

The American Astronomical Society

Erscheinungsjahr

2016

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• ABSTRACT We derive average radial gradients in the dust attenuation toward H ii regions in 609 galaxies at z ∼ 1.4, using measurements of the Balmer decrement out to r ∼ 3 kpc. The Balmer decrements are derived from spatially resolved maps of H and Hβ emission from the 3D-HST survey. We find that with increasing stellar mass M both the normalization and strength of the gradient in dust attenuation increases. Galaxies with a mean mass of M have little dust attenuation at all radii, whereas galaxies with M have AH 2 mag in their central regions. We parameterize this as , with , c = −1.9-2.2 log M10, r in kpc, and M10 the stellar mass in units of 1010 M . This expression can be used to correct spatially resolved measurements of H to radial distributions of star formation. When applied to our data, we find that the star formation rates (SFRs) in the central r < 1 kpc of galaxies in the highest mass bin are ∼6 M yr−1, six times higher than before correction and approximately half of the total SFR of these galaxies. If this high central SFR is maintained for several Gyr, a large fraction of the stars in present-day bulges likely formed in situ.