Dust Masses , PAH Abundances , and Starlight Intensities in the SINGS Galaxy Sample
نویسندگان
چکیده
Physical dust models are presented for 65 galaxies in the SINGS survey that are strongly detected in the four IRAC bands and three MIPS bands. For each galaxy we estimate (1) the total dust mass, (2) the fraction of the dust mass contributed by PAHs, and (3) the intensity of the starlight heating the dust grains. We find that spiral galaxies have dust properties resembling the dust in the local region of the Milky Way, with similar dust-togas ratio, and similar PAH abundance. The observed SEDs, including galaxies with SCUBA photometry, can be reproduced by dust models that do not require " cold " (T 10 K) dust. The dust-togas ratio is observed to be dependent on metallicity. In the interstel-lar media of galaxies with A O ≡ 12 + log 10 (O/H) > 8.1, grains contain a substantial
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