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

Authors :
Adams, J. D.
Herter, T. L.
Hora, J. L.
Schneider, N.
Lau, R. M.
Staughn, J. G.
Simon, R.
Smith, N.
Gehrz, R. D.
Allen, L. E.
Bontemps, S.
Carey, S. J.
Fazio, G. G.
Gutermuth, R. A.
Fernandez, A. Guzman
Hankins, M.
Hill, T.
Keto, E.
Koenig, X. P.
Kraemer, K. E.
Megeath, S. T.
Mizuno, D. R.
Motte, F.
Myers, P. C.
Smith, H. A.
Publication Year :
2015

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.<br />Comment: 18 pages, 11 figures, 4 tables, accepted by ApJ

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1510.04360
Document Type :
Working Paper