Evidence for large grains in the star-forming filament OMC 2/3
文献类型：期刊论文
| 作者 | Schnee, Scott1; Mason, Brian1; Di Francesco, James2,3; Friesen, Rachel1,4; Li, Di5,6 ; Sadavoy, Sarah7; Stanke, Thomas8
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2014-11-01 |
| 卷号 | 444期号:3页码:2303-2312 |
| 关键词 | stars: formation stars: protostars ISM: clouds |
| 英文摘要 | We present a new 3.3 mm continuum map of the Orion Molecular Cloud (OMC) 2/3 region. When paired with previously published maps of 1.2 mm continuum and NH3-derived temperature, we derive the emissivity spectral index of dust emission in this region, tracking its changes across the filament and cores. We find that the median value of the emissivity spectral index is 0.9, much shallower than previous estimates in other nearby molecular clouds. We find no significant difference between the emissivity spectral index of dust in the OMC 2/3 filament and the starless or protostellar cores. Furthermore, the temperature and emissivity spectral index, beta, are anticorrelated at the 4 sigma level. The low values of the emissivity spectral index found in OMC 2/3 can be explained by the presence of millimetre-sized dust grains in the dense regions of the filaments to which these maps are most sensitive. Alternatively, a shallow dust emissivity spectral index may indicate non-power-law spectral energy distributions, significant free-free emission, or anomalous microwave emission. We discuss the possible implications of millimetre-sized dust grains compared to the alternatives. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000343399600028 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6438]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Natl Radio Astron Observ, Charlottesville, VA 22903 USA 2.Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada 3.Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 3P6, Canada 4.Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Space Sci Inst, Boulder, CO 80301 USA 7.Max Planck Inst Astron, D-69117 Heidelberg, Germany 8.ESO, D-85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Schnee, Scott,Mason, Brian,Di Francesco, James,et al. Evidence for large grains in the star-forming filament OMC 2/3[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,444(3):2303-2312. |
| APA | Schnee, Scott.,Mason, Brian.,Di Francesco, James.,Friesen, Rachel.,Li, Di.,...&Stanke, Thomas.(2014).Evidence for large grains in the star-forming filament OMC 2/3.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,444(3),2303-2312. |
| MLA | Schnee, Scott,et al."Evidence for large grains in the star-forming filament OMC 2/3".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 444.3(2014):2303-2312. |
入库方式： OAI收割
来源：国家天文台
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