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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731813.0, MPI für Astronomie / Publikationen_mpia
Dust emissivity in the star-forming filament OMC 2/3
Authors:Sadavoy, S. I.; Stutz, A. M.; Schnee, S.; Mason, B. S.; Di Francesco, J.; Friesen, R. K.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Astronomy and Astrophysics
Start Page:id. A30 (11 pp)
Audience:Not Specified
Abstract / Description:We present new measurements of the dust emissivity index, β, for the high-mass, star-forming OMC 2/3 filament. We combined 160-500 μm data from Herschel with long-wavelength observations at 2 mm and fit the spectral energy distributions across a ≃2 pc long, continuous section of OMC 2/3 at 15 000 AU (0.08 pc) resolution. With these data, we measured β and reconstructed simultaneously the filtered-out large-scale emission at 2 mm. We implemented both variable and fixed values of β, finding that β = 1.7-1.8 provides the best fit across most of OMC 2/3. These β values are consistent with a similar analysis carried out with filtered Herschel data. Thus, we show that β values derived from spatial filtered emission maps agree well with those values from unfiltered data at the same resolution. Our results contradict the very low β values (~0.9) previously measured in OMC 2/3 between 1.2 mm and 3.3 mm data, which we attribute to elevated fluxes in the 3.3 mm observations. Therefore, we find no evidence of rapid, extensive dust grain growth in OMC 2/3. Future studies with Herschel data and complementary ground-based long-wavelength data can apply our technique to obtain reliable determinations of β in nearby cold molecular clouds. A FITS image for the GISMO 2 mm observations is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> ( or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/588/A30">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/588/A30</A>
Free Keywords:stars: formation; dust; extinction; ISM: clouds; submillimeter: ISM
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201527364
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