SOFIA/FORCAST Observations of Warm Dust in S106: A Fragmented Environment

Abstract : We present mid-IR (19 - 37 microns) imaging observations of S106 from SOFIA/FORCAST, complemented with IR observations from Spitzer/IRAC (3.6 - 8.0 microns), IRTF/MIRLIN (11.3 and 12.5 microns), and Herschel/PACS (70 and 160 microns). We use these observations, observations in the literature, and radiation transfer modeling to study the heating and composition of the warm (~ 100 K) dust in the region. The dust is heated radiatively by the source S106 IR, with little contributions from grain-electron collisions and Ly-alpha radiation. The dust luminosity is >~ (9.02 +/- 1.01) x 10^4 L_sun, consistent with heating by a mid- to late-type O star. We find a temperature gradient (~ 75 - 107 K) in the lobes, which is consistent with a dusty equatorial geometry around S106 IR. Furthermore, the SOFIA observations resolve several cool (~ 65 - 70 K) lanes and pockets of warmer (~ 75 - 90 K) dust in the ionization shadow, indicating that the environment is fragmented. We model the dust mass as a composition of amorphous silicates, amorphous carbon, big grains, very small grains, and PAHs. We present the relative abundances of each grain component for several locations in S106.
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Astrophysical Journal, American Astronomical Society, 2015, 814 (1), pp.id. 54. 〈10.1088/0004-637X/814/1/54〉
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https://hal.archives-ouvertes.fr/hal-01217944
Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 20 octobre 2015 - 13:43:14
Dernière modification le : lundi 11 décembre 2017 - 16:32:01

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J. D., Adams, T. L., Herter, J. L., Hora, N. Schneider, R. M., Lau, et al.. SOFIA/FORCAST Observations of Warm Dust in S106: A Fragmented Environment. Astrophysical Journal, American Astronomical Society, 2015, 814 (1), pp.id. 54. 〈10.1088/0004-637X/814/1/54〉. 〈hal-01217944〉

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