MAPPING DUST THROUGH EMISSION AND ABSORPTION IN NEARBY GALAXIES

Dust has long been identified as a barrier to measuring inherent galaxy properties. However, the link between dust and attenuation is not straightforward and depends on both the amount of dust and its disuibution. Herschel imaging of nearby galaxies undertaken as part of the KINGFISH project allows...

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Veröffentlicht in:The Astrophysical journal 2013-07, Vol.771 (1), p.1-16
Hauptverfasser: Kreckel, Kathryn, Groves, Brent, Schinnerer, Eva, Johnson, Benjamin D, ANIANO, GONZALO, Calzetti, Daniela, Croxall, Kevin V, Draine, Bruce T, Gordon, Karl D, Crocker, Alison F
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container_issue 1
container_start_page 1
container_title The Astrophysical journal
container_volume 771
creator Kreckel, Kathryn
Groves, Brent
Schinnerer, Eva
Johnson, Benjamin D
ANIANO, GONZALO
Calzetti, Daniela
Croxall, Kevin V
Draine, Bruce T
Gordon, Karl D
Crocker, Alison F
description Dust has long been identified as a barrier to measuring inherent galaxy properties. However, the link between dust and attenuation is not straightforward and depends on both the amount of dust and its disuibution. Herschel imaging of nearby galaxies undertaken as part of the KINGFISH project allows us to map the dust as seen in emission with unprecedented sensitivity and ~1 kpc resolution. We present here new optical integral field unit spectroscopy for eight of these galaxies that provides complementary 100-200 pc scale maps of the dust attenuation through observation of the reddening in both the Balmer decrement and the stellar continuum. The stellar continuum reddening, which is systematically less than that observed in the Balmer decrement, shows no clear correlation with the dust, suggesting that the distribution of stellar reddening acts as a poor tracer of the overall dust content. The brightest H II regions are observed to be preferentially located in dusty regions, and we do find a correlation between the Balmer line reddening and the dust mass surface density for which we provide an empirical relation. Some of the high-inclination systems in our sample exhibit high extinction, but we also find evidence that unresolved variations in the dust disuibution on scales smaller than 500 pc may contribute to the scatter in this relation. We caution against the use of integrated A sub(V) measures to infer global dust properties.
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subjects ABSORPTION
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ATTENUATION
BALMER LINES
Continuums
Correlation
CORRELATIONS
DENSITY
DISTRIBUTION
Dust
DUSTS
EMISSION
GALAXIES
Imaging
Links
MASS
RESOLUTION
Sciences of the Universe
SENSITIVITY
SPECTROSCOPY
SURFACES
title MAPPING DUST THROUGH EMISSION AND ABSORPTION IN NEARBY GALAXIES
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