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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559178.0, MPI für Astronomie / Publikationen_mpia
Enhanced dust heating in the bulges of early-type spiral galaxies
Authors:Engelbracht, C. W.; Hunt, L. K.; Skibba, R. A.; Hinz, J. L.; Calzetti, D.; Gordon, K. D.; Roussel, H.; Crocker, A. F.; Misselt, K. A.; Bolatto, A. D.; Kennicutt, R. C.; Appleton, P. N.; Armus, L.; Beirão, P.; Brandl, B. R.; Croxall, K. V.; Dale, D. A.; Draine, B. T.; Dumas, G.; Gil de Paz, A.; Groves, B.; Hao, C. N.; Johnson, B. D.; Koda, J.; Krause, O.; Leroy, A. K.; Meidt, S. E.; Murphy, E. J.; Rahman, N.; Rix, H. W.; Sandstrom, K. M.; Sauvage, M.; Schinnerer, E.; Smith, J. D. T.; Srinivasan, S.; Vigroux, L.; Walter, F.; Warren, B. E.; Wilson, C. D.; Wolfire, M. G.; Zibetti, S.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Start Page:id.L56
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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. Herschel is an ESA space observatory with science instruments provided by the European-led Principal Investigator consortia and with important participation from NASA.
Free Keywords:galaxies: ISM; infrared: galaxies; submillimeter: galaxies; dust; extinction
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010A%26A...518L..56... [ID No:1]
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