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The relations among 8, 24 and 160 mu m dust emission within nearby spiral galaxies

Bendo, G. J. and Draine, B. T. and Engelbracht, C. W. and Helou, G. and Thornley, M. D. and Bot, C. and Buckalew, B. A. and Calzetti, D. and Dale, D. A. and Hollenbach, D. J. and Li, A. and Moustakas, J. (2008) The relations among 8, 24 and 160 mu m dust emission within nearby spiral galaxies. Monthly Notices of the Royal Astronomical Society, 389 (2). pp. 629-650. ISSN 0035-8711. doi:10.1111/j.1365-2966.2008.13567.x.

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We investigate the relations among the stellar continuum-subtracted 8 µm polycyclic aromatic hydrocarbon (PAH 8 µm) emission, 24 µm hot dust emission and 160 µm cold dust emission in 15 nearby face-on spiral galaxies in the Spitzer Infrared Nearby Galaxies Survey sample. The relation between PAH 8 and 24 µm emission measured in ~2 kpc regions is found to exhibit a significant amount of scatter, and strong spatial variations are observed in the (PAH 8 µm)/24 µm surface brightness ratio. In particular, the (PAH 8 µm)/24 µm surface brightness ratio is observed to be high in the diffuse interstellar medium and low in bright star-forming regions and other locations with high 24 µm surface brightness. PAH 8 µm emission is found to be well-correlated with 160 µm emission on spatial scales of ~2 kpc, and the (PAH 8 µm)/160 µm surface brightness ratio is generally observed to increase as the 160 µm surface brightness increases. These results suggest that the PAHs are associated with the diffuse, cold dust that produces most of the 160 µm emission in these galaxies, and the variations in the (PAH 8 µm)/160 µm ratio may generally be indicative of either the intensity or the spectrum of the interstellar radiation field that is heating both the PAHs and the diffuse interstellar dust.

Item Type:Article
Related URLs:
URLURL TypeDescription
Draine, B. T.0000-0002-0846-936X
Helou, G.0000-0003-3367-3415
Calzetti, D.0000-0002-5189-8004
Dale, D. A.0000-0002-5782-9093
Additional Information:© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2008 June 11. Received 2008 May 30; in original form 2008 March 13. This work was funded by STFC. BTD was supported in part by NSF grant AST04-06883. AL is supported in part by the Spitzer Theory Programs and NSF grant AST 07-07866.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
NSFAST 04-06883
NSFAST 07-07866
Spitzer Theory ProgramsUNSPECIFIED
Subject Keywords:galaxies: ISM; infrared: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:BENDOmnras08
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13438
Deposited By: Tony Diaz
Deposited On:06 Jul 2009 22:50
Last Modified:08 Nov 2021 22:37

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