The ionization of accretion flows in high-mass star formation: W51e2

被引：41
|
作者：
Keto, Eric [1 ]
Klaassen, Pamela [2 ]
机构：
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 678卷 / 02期
关键词：
HII regions;
D O I：
10.1086/588657
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Previous observations show that the hypercompact H II region W51e2 is surrounded by a massive molecular accretion flow centered on the H II region. New observations of the H53 alpha radio recombination line made with the VLA at 0.45'' angular resolution show a velocity gradient in the ionized gas within the H II region of 1500 km s(-1) pc(-1) comparable to the velocity gradient seen in the molecular accretion flow. New CO line observations made with the SMA at arcsecond angular resolution detect a molecular bipolar outflow immediately around the W51e2 H II region and extending along the axis of rotation of the molecular flow. These observations are consistent with an evolutionary phase of high-mass star formation in which a newly formed massive star first begins to ionize its surroundings including its own accretion flow.
引用
收藏
页码：L109 / L112
页数：4
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