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Enhanced dust heating in the bulges of early-type spiral galaxies

Engelbracht, C. W. and Appleton, P. N. and Armus, L. and Beirão, P. and Murphy, E. J. (2010) Enhanced dust heating in the bulges of early-type spiral galaxies. Astronomy and Astrophysics, 518 . L56. ISSN 0004-6361.

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Stellar density and bar strength should affect the temperatures of the cool (T ~ 20–30 K) dust component in the inner regions of galaxies, which implies that the ratio of temperatures in the circumnuclear regions to the disk should depend on Hubble type. We investigate the differences between cool dust temperatures in the central 3 kpc and disk of 13 nearby galaxies by fitting models to measurements between 70 and 500 μm. We attempt to quantify temperature trends in nearby disk galaxies, with archival data from Spitzer/MIPS and new observations with Herschel/SPIRE, which were acquired during the first phases of the Herschel observations for the KINGFISH (Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel) sample. We fit single-temperature modified blackbodies to far-infrared and submillimeter measurements of the central and disk regions of galaxies to determine the temperature of the component(s) emitting at those wavelengths. We present the ratio of central-region-to-disk-temperatures of the cool dust component of 13 nearby galaxies as a function of morphological type. We find a significant temperature gradient in the cool dust component in all galaxies, with a mean center-to-disk temperature ratio of 1.15 ± 0.03. The cool dust temperatures in the central ~3 kpc of nearby galaxies are 23 (±3)% hotter for morphological types earlier than Sc, and only 9 (±3)% hotter for later types. The temperature ratio is also correlated with bar strength, with only strongly barred galaxies having a ratio over 1.2. The strong radiation field in the high stellar density of a galactic bulge tends to heat the cool dust component to higher temperatures, at least in early-type spirals with relatively large bulges, especially when paired with a strong bar.

Item Type:Article
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URLURL TypeDescription
Appleton, P. N.0000-0002-7607-8766
Armus, L.0000-0003-3498-2973
Murphy, E. J.0000-0001-7089-7325
Additional Information:© 2010 ESO. Received 31 March 2010; Accepted 23 April 2010. Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by the European-led Principal Investigator consortia and with important participation from NASA. The following institutes have provided hardware and software elements to the SPIRE project: University of Lethbridge, Canada; NAOC, Beijing, China; CEA Saclay, CEA Grenoble, and OAMP in France; IFSI, Rome, and University of Padua, Italy; IAC, Tenerife, Spain; Stockholm Observatory, Sweden; Cardiff University, Imperial College London, UCL-MSSL, STFCRAL, UK ATC Edinburgh, and the University of Sussex in the UK. Funding for SPIRE has been provided by the national agencies of the participating countries and by internal institute funding: CSA in Canada; NAOC in China; CNES, CNRS, and CEA in France; ASI in Italy; MCINN in Spain; Stockholm Observatory in Sweden; STFC in the UK; and NASA in the USA. Additional funding support for some instrument activities has been provided by ESA. We would also like to thank the anonymous referee whose comments helped improve this paper.
Subject Keywords:galaxies: ISM; infrared: galaxies; submillimeter: galaxies; dust, extinction
Record Number:CaltechAUTHORS:20101115-102436862
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Official Citation:Enhanced dust heating in the bulges of early-type spiral galaxies C. W. Engelbracht, L. K. Hunt, R. A. Skibba, J. L. Hinz, D. Calzetti, K. D. Gordon, H. Roussel, A. F. Crocker, K. A. Misselt, A. D. Bolatto, R. C. Kennicutt, P. N. Appleton, L. Armus, P. Beirão, B. R. Brandl, K. V. Croxall, D. A. Dale, B. T. Draine, G. Dumas, A. Gil de Paz, B. Groves, C.-N. Hao, B. D. Johnson, J. Koda, O. Krause, A. K. Leroy, S. E. Meidt, E. J. Murphy, N. Rahman, H.-W. Rix, K. M. Sandstrom, M. Sauvage, E. Schinnerer, J.-D. T. Smith, S. Srinivasan, L. Vigroux, F. Walter, B. E. Warren, C. D. Wilson, M. G. Wolfire and S. Zibetti A&A 518 L56 (2010) DOI: 10.1051/0004-6361/201014677
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20805
Deposited By: Jason Perez
Deposited On:15 Nov 2010 22:36
Last Modified:24 Feb 2020 10:30

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