2010A&A...518L..56E


Query : 2010A&A...518L..56E

2010A&A...518L..56E - Astronomy and Astrophysics, volume 518, L56-56 (2010/7-2)

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

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., BEIRAO 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. and ZIBETTI S.

Abstract (from CDS):

Stellar density and bar strength should affect the temperatures of the cool (T∼20-30K) 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 3kpc and disk of 13 nearby galaxies by fitting models to measurements between 70 and 500µm. 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 ∼3kpc 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.

Abstract Copyright:

Journal keyword(s): galaxies: ISM - infrared: galaxies - submillimeter: galaxies - dust, extinction

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1612 1
2 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 747 1
3 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1277 3
4 NGC 1269 GiG 03 17 18.5785534752 -41 06 28.628735184 9.85 9.83 8.81 8.72   ~ 405 1
5 NGC 1512 GiP 04 03 54.281 -43 20 55.86 11.30 11.43 10.54 10.37   ~ 366 1
6 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 551 3
7 NGC 4559 H2G 12 35 57.6402869976 +27 57 35.859278160   10.46 10.01     ~ 593 1
8 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1351 3
9 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1053 2
10 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1166 2
11 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2767 2
12 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2425 2
13 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1188 2

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2023.01.31-02:41:53

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