Spectral line survey of the ultracompact HII region Monoceros R2
نویسندگان
چکیده
منابع مشابه
Kinematics of Ultracompact HII Regions Revealed : High Spatial and Spectral Resolution Mapping of the 12 . 8 μ m [ Ne II ] Line in Monoceros R 2
We present the first results of a study of the kinematics and morphology of ultracompact H II regions using a new observational technique. We used very high spatial and spectral resolution observations (θ Beam =1.4 ′′ , ∆V= 3.4 km s −1) of the [Ne II] line at 12.8 µm to study the ionized gas in Monoceros R2. The [Ne II] emission shows an H II region with highest emission measure in a ∼24 ′′ dia...
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The Monoceros R2 region was first recognized as a chain of reflection nebulae illuminated by Aand B-type stars. These nebulae are associated with a giant molecular cloud that is one of the closest massive star forming regions to the Sun. This chapter reviews the properties of the Mon R2 region, including the namesake reflection nebulae, the large scale molecular cloud, global star formation act...
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Ultracompact (UC) HII regions are currently the best known tracer of massive YSOs and represent the earliest confirmed stage of massive star formation. In excess of 150 UC HII regions have been detected, mainly by radio surveys. Whilst the environments of UC HII regions are known very well on the small scale (a few arcseconds) they are not well known on scales over 40. This is because most UC H...
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A survey of ultracompact (UC) HII regions has been carried out by searching for 6.669GHz methanol maser emission from a sample of 535 IRAS selected candidates. A total of 201 candidates exhibit methanol emission. These sources have been used, in conjunction with previously identiied UC HII regions, to provide a base for further studies of such regions. Estimates of distances have indicated that...
متن کاملThe environs of the ultracompact HII region G 45 . 45 + 0 . 06
Aims. G45.45+0.06 is an ultra-compact HII (UCHII) region extensively studied. It is known that G45.45+0.06 is embedded in a complex of UCHII regions, but up the date, the surrounding ISM in a larger spatial scale has not been analyzed. Methods. Using data from large-scale surveys: Two Micron All Sky Survey, GLIMPSE, MIPSGAL, MAGPIS and GRS, we performed a multiwavelength study of a region about...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201118347