THE ARECIBO METHANOL MASER GALACTIC PLANE SURVEY. IV. ACCURATE ASTROMETRY AND SOURCE MORPHOLOGIES

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	THE ARECIBO METHANOL MASER GALACTIC PLANE SURVEY. IV. ACCURATE ASTROMETRY AND SOURCE MORPHOLOGIES
	Pandian, J. D.1; Momjian, E.2; Xu, Y.3 ; Menten, K. M.4; Goldsmith, P. F.5
刊名	ASTROPHYSICAL JOURNAL
	2011-03-20
卷号	730 期号:1 页码:55(27pp)
关键词	astrometry instrumentation: high angular resolution masers stars: formation
ISSN号	0004-637X
英文摘要	We present accurate absolute astrometry of 6.7 GHz methanol masers detected in the Arecibo Methanol Maser Galactic Plane Survey using MERLIN and the Expanded Very Large Array (EVLA). We estimate the absolute astrometry to be accurate to better than 15 and 80 mas for the MERLIN and EVLA observations, respectively. We also derive the morphologies of the maser emission distributions for sources stronger than similar to 1 Jy. The median spatial extent along the major axis of the regions showing maser emission is similar to 775 AU. We find a majority of methanol maser morphologies to be complex with some sources previously determined to have regular morphologies in fact being embedded within larger structures. This suggests that some maser spots do not have a compact core, which leads to them being resolved in high angular resolution observations. This also casts doubt on interpretations of the origin of methanol maser emission solely based on source morphologies. We also investigate the association of methanol masers with mid-infrared emission and find very close correspondence between methanol masers and 24 p,m point sources. This adds further credence to theoretical models that predict methanol masers to be pumped by warm dust emission and firmly reinforces the finding that Class II methanol masers are unambiguous tracers of embedded high-mass protostars.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	VLBA CALIBRATOR SURVEY ; YOUNG STELLAR OBJECTS ; STAR-FORMING REGIONS ; HIGH-RESOLUTION ; EMISSION ; W3(OH) ; SITES ; DISC
收录类别	SCI
语种	英语
WOS记录号	WOS:000288453600054
公开日期	2012-08-07
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4559]
专题	紫金山天文台_紫金山天文台青海观测站
作者单位	1.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA 2.Natl Radio Astron Observ, Socorro, NM 87801 USA 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 4.Max Planck Inst Radioastron, D-53121 Bonn, Germany 5.CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
推荐引用方式 GB/T 7714	Pandian, J. D.,Momjian, E.,Xu, Y.,et al. THE ARECIBO METHANOL MASER GALACTIC PLANE SURVEY. IV. ACCURATE ASTROMETRY AND SOURCE MORPHOLOGIES[J]. ASTROPHYSICAL JOURNAL,2011,730(1):55(27pp).
APA	Pandian, J. D.,Momjian, E.,Xu, Y.,Menten, K. M.,&Goldsmith, P. F..(2011).THE ARECIBO METHANOL MASER GALACTIC PLANE SURVEY. IV. ACCURATE ASTROMETRY AND SOURCE MORPHOLOGIES.ASTROPHYSICAL JOURNAL,730(1),55(27pp).
MLA	Pandian, J. D.,et al."THE ARECIBO METHANOL MASER GALACTIC PLANE SURVEY. IV. ACCURATE ASTROMETRY AND SOURCE MORPHOLOGIES".ASTROPHYSICAL JOURNAL 730.1(2011):55(27pp).