Journal
ASTROPHYSICAL JOURNAL
Volume 833, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/833/1/58
Keywords
dust, extinction; galaxies: halos; ultraviolet: galaxies
Categories
Funding
- Association of Universities for Research in Astronomy, Inc., under NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- NASA [NNH13ZDA001N-SWIFT]
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We examine ultraviolet halos around a sample of highly inclined galaxies within 25 Mpc to measure their morphology and luminosity. Despite contamination from galactic light scattered into the wings of the point-spread function, we find that ultraviolet (UV) halos occur around each galaxy in our sample. Around most galaxies the halos form a thick, diffuse disk-like structure, but starburst galaxies with galactic superwinds have qualitatively different halos that are more extensive and have filamentary structure. The spatial coincidence of the UV halos above star-forming regions, the lack of consistent association with outflows or extraplanar ionized gas, and the strong correlation between the halo and galaxy UV luminosity suggest that the UV light is an extragalactic reflection nebula. UV halos may thus represent 10(6)-10(7) Me of dust within 2-10 kpc of the disk, whose properties may change with height in starburst galaxies.
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