THE JCMT GOULD BELT SURVEY: EVIDENCE FOR DUST GRAIN EVOLUTION IN PERSEUS STAR-FORMING CLUMPS
| Autor: | Glenn J. White, Jane Greaves, David S. Berry, Emily Drabek-Maunder, Ana Duarte-Cabral, Steve Mairs, Harold M. Butner, Malcolm J. Currie, J. G. A. Wouterloot, M. Fich, J. A. Yates, G. Joncas, S. Viti, J. Di Francesco, C. Quinn, Nicholas F. H Tothill, Helen Kirk, Jason Fiege, J. Gregson, Christopher J. Davis, Antonio Chrysostomou, Jonathan Rawlings, T. Jenness, Rachel Friesen, C. Salji, D. Rumble, Lewis B. G. Knee, Michael Chun-Yuan Chen, Erik Rosolowsky, Sarah Sadavoy, S. Tisi, J. V. Buckle, Wayne S. Holland, Joseph C. Mottram, D. Bresnahan, M. Zhu, Derek Ward-Thompson, Simon Coudé, Sarah Graves, Gary A. Fuller, Pierre Bastien, C. Mowat, H. Broekhoven-Fiene, D. Robertson, Kenneth A. Marsh, Michiel R. Hogerheijde, Jennifer Hatchell, Doug Johnstone, H. Thomas, Kate Pattle, Per Friberg, Stefano Pezzuto, Brenda C. Matthews, D. Nutter, J. S. Richer, Jason M. Kirk, Gerald H. Moriarty-Schieven, Jaime E. Pineda, N. Schneider-Bontemps |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Extinction (astronomy)
FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics F500 01 natural sciences 010305 fluids & plasmas 0103 physical sciences Protostar Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Stellar evolution Optical depth Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) QB Cosmic dust Physics Spectral index Molecular cloud Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | ASTROPHYSICAL JOURNAL, 826(1), 95 ASTROPHYSICAL JOURNAL |
| ISSN: | 0004-637X 1538-4357 |
| Popis: | The dust emissivity spectral index, $\beta$, is a critical parameter for deriving the mass and temperature of star-forming structures, and consequently their gravitational stability. The $\beta$ value is dependent on various dust grain properties, such as size, porosity, and surface composition, and is expected to vary as dust grains evolve. Here we present $\beta$, dust temperature, and optical depth maps of the star-forming clumps in the Perseus Molecular Cloud determined from fitting SEDs to combined Herschel and JCMT observations in the 160 $\mu$m, 250 $\mu$m, 350 $\mu$m, 500 $\mu$m, and 850 $\mu$m bands. Most of the derived $\beta$, and dust temperature values fall within the ranges of 1.0 - 2.7 and 8 - 20 K, respectively. In Perseus, we find the $\beta$ distribution differs significantly from clump to clump, indicative of grain growth. Furthermore, we also see significant, localized $\beta$ variations within individual clumps and find low $\beta$ regions correlate with local temperature peaks, hinting at the possible origins of low $\beta$ grains. Throughout Perseus, we also see indications of heating from B stars and embedded protostars, as well evidence of outflows shaping the local landscape. Comment: Accepted to ApJ, 15 figures, 3 tables |
| Databáze: | OpenAIRE |
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