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Article overview
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Empirical determination of the shape of dust attenuation curves in star-forming galaxies | Vivienne Wild
; Stephane Charlot
; Jarle Brinchmann
; Timothy Heckman
; Oliver Vince
; Camilla Pacifici
; Jacopo Chevallard
; | Date: |
8 Jun 2011 | Abstract: | We present a systematic study of the shape of the dust attenuation curve in
star-forming galaxies from the far ultraviolet to the near infrared
(0.15-2microns), as a function of specific star formation rate (sSFR) and axis
ratio (b/a), for galaxies with and without a significant bulge. Our sample
comprises 23,000 (15,000) galaxies with a median redshift of 0.07, with
photometric entries in the SDSS, UKIDSS-LAS (and GALEX-AIS) survey catalogues
and emission line measurements from the SDSS spectroscopic survey. We develop a
new pair-matching technique to isolate the dust attenuation curves from the
stellar continuum emission. The main results are: (i) the slope of the
attenuation curve in the optical varies weakly with sSFR, strongly with b/a,
and is significantly steeper than the Milky Way extinction law in
bulge-dominated galaxies; (ii) the NIR slope is constant, and matches the slope
of the Milky Way extinction law; (iii) the UV has a slope change consistent
with a dust bump at 2175AA which is evident in all samples and varies strongly
in strength with b/a in the bulge-dominated sample; (iv) there is a strong
increase in emission line-to-continuum dust attenuation with both decreasing
sSFR and increasing b/a; (v) radial gradients in dust attenuation increase
strongly with increasing sSFR, and the presence of a bulge does not alter the
strength of the gradients. These results are consistent with the picture in
which young stars are surrounded by dense ’birth clouds’ with low covering
factor which disperse on timescales of ~1e7 years and the diffuse interstellar
dust is distributed in a centrally concentrated disk with a smaller scaleheight
than the older stars that contribute the majority of the red and NIR light.
[abridged] | Source: | arXiv, 1106.1646 | Services: | Forum | Review | PDF | Favorites |
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