Ultraviolet Extinction in Backlit Galaxies - from Galaxy Zoo to GALEX

Details Ultraviolet Extinction in Backlit Galaxies - from Galaxy Zoo to GALEX Ultraviolet Extinction in Backlit Galaxies - from Galaxy Zoo to GALEX

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934623k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #346.23

Astronomy and Astrophysics

Astrophysics

Scientific paper

We examine the ultraviolet extinction of galaxies on large scales, combining optical and GALEX UV data on backlit galaxies (most found in the Galaxy Zoo citizen-science project). We analyze the images
in matching ways, modelling both foreground and background galaxies by symmetry or elliptical isophote families as appropriate, and using the
non-overlapping regions of the galaxies to estimate errors in the derived transmission T=e-κ. Spirals appear less symmetric in the UV, as star-forming regions become more dominant, so that our most reliable results are mean values across multiple regions and multiple galaxies. Our mean effective extinction curve is dominated by the contribution of luminous spirals,and shows a fairly flat gray" extinction law into the ultraviolet. For example, the median of κNUV/κB in spiral arms is only 1.3. Along with previous high-resolution HST studies of a few nearby backlit galaxies, this suggests that on kpc scales the effective extinction is dominated by the
dust clumping rather than the intrinsic reddening law. This implies that extrapolation of local properties to short wavelengths, a step toward the
history of dust in galaxies through comparison of local properties with a similar analysis in deep HST fields, can be done without introducing much
additional error. This work was supported by NASA Astrophysics Data Analysis Program grant NNX10AD54G.

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