Properties of the UCHII region G25.4NW and its associated molecular cloud

被引：7

作者：

Ai, Mei ^{[1
]}

Zhu, Ming ^{[1
]}

Xiao, Li ^{[1
]}

Su, Hong-Quan ^{[1
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2013年 / 13卷 / 08期

基金：

中国国家自然科学基金;

关键词：

radiation mechanisms: thermal; ISM: atoms; ISM: HII regions; ISM: molecules; H-II REGIONS; CORE JCMT 18354-0649S; HII-REGIONS; INNER GALAXY; MILKY-WAY; RADIO; RESOLUTION; DISTANCE;

D O I：

10.1088/1674-4527/13/8/005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ultra compact HII (UCHII) G25.4NW is a bright IR source in the region of the inner Galaxy. New HI images from the Very Large Array Galactic Plane Survey show clear absorption features associated with the UCHII region up to 95 km s(-1), and there are no other absorptions up to the tangential velocity. This reveals that G25.4NW has a near-side distance of 5.7 kpc, and it is located in the region of the inner Galactic molecular ring. Using the new distance, the bolometric luminosity of G25.4NW is estimated as 10(5.6) L-circle dot, which corresponds to an O6 star. It contains 460 M-circle dot of ionized gas. A high-resolution (CO)-C-13 image from the Galactic Ring Survey reveals that G25.4NW is part of a more extended star-forming complex with about 10(4) M-circle dot of molecular gas.

引用

页码：935 / 944

页数：10

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