CHARACTERIZATION OF MOLECULAR OUTFLOWS IN THE SUBSTELLAR DOMAIN
文献类型：期刊论文
| 作者 | Ngoc Phan-Bao1,2; Lee, Chin-Fei2; Ho, Paul T. P.2,3; Cuong Dang-Duc1,4; Li, Di5
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-11-01 |
| 卷号 | 795期号:1 |
| 关键词 | brown dwarfs ISM: individual objects (GM Tau, 2MASS J04141188+2811535, 2MASS J04381486+2611399) ISM: jets and outflows stars: formation stars: low-mass techniques: interferometric |
| 英文摘要 | We report here our latest search for molecular outflows from young brown dwarfs and very low-mass stars in nearby star-forming regions. We have observed three sources in Taurus with the Submillimeter Array and the Combined Array for Research in Millimeter-wave Astronomy at 230 GHz frequency to search for CO J = 2 -> 1 outflows. We obtain a tentative detection of a redshifted and extended gas lobe at about 10 arcsec from the source GM Tau, a young brown dwarf in Taurus with an estimated mass of 73 M-J, which is right below the hydrogen-burning limit. No blueshifted emission around the brown dwarf position is detected. The redshifted gas lobe that is elongated in the northeast direction suggests a possible bipolar outflow from the source with a position angle of about 36 degrees. Assuming that the redshifted emission is outflow emission from GM Tau, we then estimate a molecular outflow mass in the range from 1.9 x 10(-6) M-circle dot to 2.9 x 10(-5) M-circle dot and an outflow mass-loss rate from 2.7 x 10(-9) M-circle dot yr(-1) to 4.1 x 10(-8) M-circle dot yr(-1). These values are comparable to those we have observed in the young brown dwarf ISO-Oph 102 of 60 M-J in rho Ophiuchi and the very low-mass star MHO 5 of 90 M-J in Taurus. Our results suggest that the outflow process in very low-mass objects is episodic with a duration of a few thousand years and the outflow rate of active episodes does not significantly change for different stages of the formation process of very low-mass objects. This may provide us with important implications that clarify the formation process of brown dwarfs. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000343857300070 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6631]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Int Univ Vietnam Natl Univ HCM, Dept Phys, Linh Trung Ward, Thanh Pho Ho Chi Minh, Vietnam 2.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan 3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 4.Univ Sci Vietnam Natl Univ HCM, Fac Phys & Engn Phys, Thanh Pho Ho Chi Minh, Vietnam 5.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ngoc Phan-Bao,Lee, Chin-Fei,Ho, Paul T. P.,et al. CHARACTERIZATION OF MOLECULAR OUTFLOWS IN THE SUBSTELLAR DOMAIN[J]. ASTROPHYSICAL JOURNAL,2014,795(1). |
| APA | Ngoc Phan-Bao,Lee, Chin-Fei,Ho, Paul T. P.,Cuong Dang-Duc,&Li, Di.(2014).CHARACTERIZATION OF MOLECULAR OUTFLOWS IN THE SUBSTELLAR DOMAIN.ASTROPHYSICAL JOURNAL,795(1). |
| MLA | Ngoc Phan-Bao,et al."CHARACTERIZATION OF MOLECULAR OUTFLOWS IN THE SUBSTELLAR DOMAIN".ASTROPHYSICAL JOURNAL 795.1(2014). |
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来源：国家天文台
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