Reliable Galaxy-wide identification of ultracompact H II regions

Balasubramanyam, R.; Sridharan, T.K.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4918

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DC Field	Value	Language
dc.contributor.author	Balasubramanyam, R.	-
dc.contributor.author	Sridharan, T.K.	-
dc.date.accessioned	2012-07-14T10:08:02Z	-
dc.date.available	2012-07-14T10:08:02Z	-
dc.date.issued	1997	-
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 1997, Vol.284, p1001	en
dc.identifier.issn	0035-8711	-
dc.identifier.uri	http://hdl.handle.net/2289/4918	-
dc.description	Restricted Access	en
dc.description.abstract	We examine the problem of reliably identifying ultracompact (UC) H ii regions from Galaxy- wide data bases. It is shown that there is significant contamination in the sample of potential UC H ii regions, selected from the IRAS PSC using the two-colour criterion of Wood & Churchwell, due to cloud cores with lower mass stars. We identify additional criteria to reduce this contamination. First, we use the differences in the radio emission between the cores with embedded high- and low-mass stars to segregate them. Then, through a latitude analysis we further improve the reliability. Effectively, the total number of potential UC H ii regions is brought down by a factor of ~4. This reduction eases the birth rate problem for massive stars, and offers a more reliable list of young massive stars for galactic structure studies. In the process, we have also identified a group of objects which may contain high-mass equivalents of the class 0 objects and clusters of intermediate-mass stars.	en
dc.language.iso	en	en
dc.publisher	Blackwell Publishing for the Royal Astronomical Society	en
dc.relation.uri	http://adsabs.harvard.edu/abs/1997MNRAS.284.1001R	en
dc.rights	1997 Blackwell Publishing for the Royal Astronomical Society	en
dc.title	Reliable Galaxy-wide identification of ultracompact H II regions	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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