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, Sylvain; CAREY, S. J.,; FAZIO, G. G.,; GUTERMUTH, R. A.,; GUZMAN FERNANDEZ, A.,; 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.,

doi:10.1088/0004-637X/814/1/54

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ADAMS, J. D.,
Department of Astronomy [Ithaca]

HERTER, T. L.,
Department of Astronomy [Ithaca]

HORA, J. L.,

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The Astrophysical Journal. 2015-10, vol. 814, n° 1, p. id. 54

American Astronomical Society

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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.< Réduire

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Astrophysics - Solar and Stellar Astrophysics

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

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