THE FIRST VERY LONG BASELINE INTERFEROMETRY IMAGE OF A 44 GHz METHANOL MASER WITH THE KVN AND VERA ARRAY (KaVA)

	THE FIRST VERY LONG BASELINE INTERFEROMETRY IMAGE OF A 44 GHz METHANOL MASER WITH THE KVN AND VERA ARRAY (KaVA)
	Matsumoto, Naoko 1; Hirota, Tomoya 1,2; Sugiyama, Koichiro 3; Kim, Kee-Tae 4; Kim, Mikyoung 4; Byun, Do-Young 4; Jung, Taehyun 4; Chibueze, James O.5; Honma, Mareki 1,2; Kameya, Osamu 1
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2014-07-01
卷号	789 期号:1
关键词	instrumentation: interferometers ISM: individual objects (IRAS 18151-1208 MM2) masers stars: formation techniques: high angular resolution
英文摘要	We have carried out the first very long baseline interferometry (VLBI) imaging of a 44 GHz class I methanol maser (70-61A(+)) associated with a millimeter core MM2 in a massive star-forming region IRAS 18151-1208 with KaVA (KVN and VERA Array), which is a newly combined array of KVN (Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). We have succeeded in imaging compact maser features with a synthesized beam size of 2.7 milliarcseconds x 1.5 milliarcseconds (mas). These features are detected at a limited number of baselines within the length of shorter than approximate to 650 km corresponding to 100 M. in the uv-coverage. The central velocity and the velocity width of the 44 GHz methanol maser are consistent with those of the quiescent gas rather than the outflow traced by the SiO thermal line. The minimum component size among the maser features is similar to 5 mas x 2 mas, which corresponds to the linear size of similar to 15 AU x 6 AU assuming a distance of 3 kpc. The brightness temperatures of these features range from similar to 3.5 x 10(8) to 1.0 x 10(10) K, which are higher than the estimated lower limit from a previous Very Large Array observation with the highest spatial resolution of similar to 50 mas. The 44 GHz class I methanol maser in IRAS 18151-1208 is found to be associated with the MM2 core, which is thought to be less evolved than another millimeter core MM1 associated with the 6.7 GHz class II methanol maser.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	STAR-FORMING REGIONS ; EARLY EVOLUTIONARY STAGES ; CLASS-I ; PROTOSTELLAR CANDIDATES ; CONTINUUM OBSERVATIONS ; SOFTWARE CORRELATOR ; MASSIVE CLUMPS ; VLBI NETWORK ; CORES ; CH3OH
收录类别	SCI
语种	英语
WOS记录号	WOS:000338563300001
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18195]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Natl Astron Observ Japan, Mizusawa VLBI Observ, Mitaka, Tokyo 1818588, Japan 2.Grad Univ Adv Studies, SOKENDAI, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan 3.Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi, Yamaguchi 7538512, Japan 4.Korea Astron & Space Sci Inst, Taejon 305348, South Korea 5.Natl Astron Observ Japan, East Asian ALMA Reg Ctr, Tokyo 1818588, Japan 6.Univ Michigan, Dept Astron, Ann Arbor, MI 48105 USA 7.Teikyo Univ Sci, Ctr Fundamental Educ, Uenohara, Yamanashi 4090193, Japan 8.Kyung Hee Univ, Dept Astron & Space Sci, Yongin 446701, Gyeonggi Do, South Korea 9.Yaeyama Star Club, Okinawa 9040022, Japan 10.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Matsumoto, Naoko,Hirota, Tomoya,Sugiyama, Koichiro,et al. THE FIRST VERY LONG BASELINE INTERFEROMETRY IMAGE OF A 44 GHz METHANOL MASER WITH THE KVN AND VERA ARRAY (KaVA)[J]. ASTROPHYSICAL JOURNAL LETTERS,2014,789(1).
APA	Matsumoto, Naoko.,Hirota, Tomoya.,Sugiyama, Koichiro.,Kim, Kee-Tae.,Kim, Mikyoung.,...&Yun, Young Joo.(2014).THE FIRST VERY LONG BASELINE INTERFEROMETRY IMAGE OF A 44 GHz METHANOL MASER WITH THE KVN AND VERA ARRAY (KaVA).ASTROPHYSICAL JOURNAL LETTERS,789(1).
MLA	Matsumoto, Naoko,et al."THE FIRST VERY LONG BASELINE INTERFEROMETRY IMAGE OF A 44 GHz METHANOL MASER WITH THE KVN AND VERA ARRAY (KaVA)".ASTROPHYSICAL JOURNAL LETTERS 789.1(2014).