A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey
文献类型：期刊论文
| 作者 | Elia, D.1,2; Schisano, E.1,3; Molinari, S.1; Robitaille, T.4; Angles-Alcazar, D.5; Bally, J.7; Battersby, C.7; Benedettini, M.1; Billot, N.8; Calzoletti, L.9 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2010-07-01 |
| 卷号 | 518 |
| 关键词 | stars: formation stars: pre-main sequence |
| 英文摘要 | We present a first study of the star-forming compact dust condensations revealed by Herschel in the two 2 degrees x2 degrees Galactic Plane fields centered at [l, b] = [30 degrees, 0 degrees] and [l, b] = [59 degrees, 0 degrees], respectively, and observed during the science demonstration phase for the Herschel Infrared GALactic plane survey (Hi-GAL) key-project. Compact source catalogs extracted for the two fields in the five Hi-GAL bands (70, 160, 250, 350 and 500 mu m) were merged based on simple criteria of positional association and spectral energy distribution (SED) consistency into a final catalog which contains only coherent SEDs with counterparts in at least three adjacent Herschel bands. These final source lists contain 528 entries for the l = 30 degrees field, and 444 entries for the l = 59 degrees field. The SED coverage has been augmented with ancillary data at 24 mu m and 1.1 mm. SED modeling for the subset of 318 and 101 sources (in the two fields, respectively) for which the distance is known was carried out using both a structured star/disk/envelope radiative transfer model and a simple isothermal grey-body. Global parameters like mass, luminosity, temperature and dust properties have been estimated. The L(bo)l/M(env) ratio spans four orders of magnitudes from values compatible with the pre-protostellar phase to embedded massive zero-age main sequence stars. Sources in the l = 59 degrees field have on average lower L/M, possibly outlining an overall earlier evolutionary stage with respect to the sources in the l = 30 degrees field. Many of these cores are actively forming high-mass stars, although the estimated core surface densities appear to be an order of magnitude below the 1 g cm(-2) critical threshold for high-mass star formation. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000281527200098 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7728]  |
| 专题 | 国家天文台_应用天文研究部 |
| 作者单位 | 1.INAF, Ist Fis Spazio Interplanetario, I-00133 Rome, Italy 2.Observ Astron Lisboa, P-1349018 Lisbon, Portugal 3.Univ Naples Federico 2, Dipartimento Sci Fisiche, Naples, Italy 4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 5.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA 6.Univ Puerto Rico, Dept Phys, UPR Stn, San Juan, PR 00936 USA 7.Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA 8.CALTECH, NASA, Herschel Sci Ctr, IPAC, Pasadena, CA 91125 USA 9.ASI Sci Data Ctr, I-00044 Frascati, Italy 10.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Elia, D.,Schisano, E.,Molinari, S.,et al. A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey[J]. ASTRONOMY & ASTROPHYSICS,2010,518. |
| APA | Elia, D..,Schisano, E..,Molinari, S..,Robitaille, T..,Angles-Alcazar, D..,...&Veneziani, M..(2010).A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey.ASTRONOMY & ASTROPHYSICS,518. |
| MLA | Elia, D.,et al."A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey".ASTRONOMY & ASTROPHYSICS 518(2010). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。