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Dust temperature tracing the ISRF intensity in the Galaxy

Bernard, J.-Ph. and Paradis, D. and Paladini, R. and Noriega-Crespo, A. and Flagey, N. and Reach, W. (2010) Dust temperature tracing the ISRF intensity in the Galaxy. Astronomy and Astrophysics, 518 . Art. No. L88. ISSN 0004-6361.

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New observations with Herschel allow accurate measurement of the equilibrium temperature of large dust grains heated by the interstellar radiation field (ISRF), which is critical in deriving dust column density and masses. We present temperature maps derived from the Herschel SPIRE and PACS data in two fields along the Galactic plane, obtained as part of the Hi-GAL survey during the Herschel science demonstration phase (SDP). We analyze the distribution of the dust temperature spatially, as well as along the two lines-of-sight (LOS) through the Galaxy. The zero-level offsets in the Herschel maps were established by comparison with the IRAS and Planck data at comparable wavelengths. We derive maps of the dust temperature and optical depth by adjusting a detailed model for dust emission at each pixel. The dust temperature maps show variations in the ISRF intensity and reveal the intricate mixture of the warm dust heated by massive stars and the cold filamentary structures of embedded molecular clouds. The dust optical depth at 250 μm is well correlated with the gas column density, but with a significantly higher dust emissivity than in the solar neighborhood. We correlate the optical depth with 3-D cubes of the dust extinction to investigate variations in the ISRF strength and dust abundance along the line of sight through the spiral structure of the Galaxy. We show that the warmest dust along the LOS is located in the spiral arms of the Galaxy, and we quantify their respective IR contribution.

Item Type:Article
Related URLs:
URLURL TypeDescription
Paladini, R.0000-0002-5158-243X
Noriega-Crespo, A.0000-0002-6296-8960
Flagey, N.0000-0002-8763-1555
Reach, W.0000-0001-8362-4094
Additional Information:© 2010 ESO. Received 30 March 2010, Accepted 26 April 2010, Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Figures 3–6 are only available in electronic form at We acknowledge the Planck consortium for allowing the use of the Planck HFI data for propagating the zero level to the SPIRE bands.
Subject Keywords:ISM: general, dust, extinction, ISM: clouds, galaxies: ISM, infrared: ISM, submillimeter: ISM
Record Number:CaltechAUTHORS:20101124-100126117
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Official Citation:Dust temperature tracing the ISRF intensity in the Galaxy J.-Ph. Bernard, D. Paradis, D. J. Marshall, L. Montier, G. Lagache, R. Paladini, M. Veneziani, C. M. Brunt, J. C. Mottram, P. Martin, I. Ristorcelli, A. Noriega-Crespo, M. Compiègne, N. Flagey, L. D. Anderson, C. C. Popescu, R. Tuffs, W. Reach, G. White, M. Benedetti, L. Calzoletti, A. M. DiGiorgio, F. Faustini, M. Juvela, C. Joblin, G. Joncas, M.-A. Mivilles-Deschenes, L. Olmi, A. Traficante, F. Piacentini, A. Zavagno and S. Molinari A&A 518 L88 (2010) DOI: 10.1051/0004-6361/201014540
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21016
Deposited By: Benjamin Perez
Deposited On:24 Nov 2010 18:37
Last Modified:09 Mar 2020 13:19

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