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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1307.6216 (astro-ph)
[Submitted on 23 Jul 2013]

Title:Dusty Winds: Extraplanar PAH Features of Nearby Galaxies

Authors:Alexander McCormick, Sylvain Veilleux, David S. N. Rupke
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Abstract:Recent observations have shown the presence of dust and molecular material in galactic winds, but relatively little is known about the distribution of these outflow components. To shed some light on this issue, we have used IRAC images from the Spitzer Space Telescope archive to investigate polycyclic aromatic hydrocarbon (PAH) emission from a sample of 16 local galaxies with known winds. Our focus on nearby sources (median distance 8.6 Mpc) has revealed detailed PAH structure in the winds and allowed us to measure extraplanar PAH emission. We have identified extraplanar PAH features on scales of ~ 0.8 - 6.0 kpc. We find a nearly linear correlation between the amount of extraplanar PAH emission and the total infrared flux, a proxy for star formation activity in the disk. Our results also indicate a correlation between the height of extraplanar PAH emission and star formation rate surface density, which supports the idea of a surface density threshold on the energy or momentum injection rate for producing detectable extraplanar wind material.
Comments: 53 pages, 13 figures, Accepted for publication in ApJ
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:1307.6216 [astro-ph.CO]
  (or arXiv:1307.6216v1 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1307.6216

Submission history

From: Alexander McCormick [view email]
[v1] Tue, 23 Jul 2013 20:00:05 UTC (14,393 KB)
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