Molecular superbubbles in the starburst galaxy NGC 253

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 分子云与恒星形成研究团组

	Molecular superbubbles in the starburst galaxy NGC 253
	Sakamoto, K ; Ho, PTP ; Iono, D ; Keto, ER ; Mao, RQ; Matsushita, S ; Peck, AB ; Wiedner, MC ; Wilner, DJ ; Zhao, JH
刊名	ASTROPHYSICAL JOURNAL
	2006-01-10
卷号	636 期号:2 页码:685-697
关键词	galaxies : individual ( NGC 253) galaxies : ISM galaxies : starburst ISM : bubbles
ISSN号	0004-637X
英文摘要	The central 2; 1 kpc of the starburst galaxy NGC 253 have been imaged using the Submillimeter Array at a 60 pc resolution in the J = 2 - 1 transitions of (12)CO, (13)CO, and C(18)O, as well as in the 1.3 mm continuum. Molecular gas and dust are distributed mainly in a circumnuclear disk of similar to 500 pc radius, with warm (similar to 40 K) and high area filling factor gas in its central part. Two gas shells or cavities have been discovered in the circumnuclear disk. They have similar to 100 pc diameters and have large velocity widths of 80 - 100 km s(-1), suggestive of expansion at similar to 50 km s(-1) . Modeled as an expanding bubble, each shell has an age of similar to 0.5 Myr and needed kinetic energy of similar to 1; 10(46) J, as well as mean mechanical luminosity of similar to 1; 10(33) W, for its formation. The large energy allows each to be called a superbubble. A similar to 10(6) M circle dot super star cluster can provide the luminosity and could be a building block of the nuclear starburst in NGC 253. Alternatively, a hypernova can also be the main source of energy for each superbubble, not only because it can provide the mechanical energy and luminosity but also because the estimated rate of superbubble formation and that of hypernova explosions are comparable. Our observations indicate that the circumnuclear molecular disk harboring the starburst is highly disturbed on 100 pc or smaller scales, presumably by individual young clusters and stellar explosions, in addition to being globally disturbed in the form of the well-known superwind.
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]	SUPER-STAR CLUSTER ; NGC 253 ; INTERSTELLAR-MEDIUM ; NEARBY GALAXIES ; DENSE GAS ; CHANDRA OBSERVATIONS ; NUCLEAR STARBURST ; MICRON EMISSION ; SPIRAL GALAXIES ; M82
收录类别	SCI
语种	英语
WOS记录号	WOS:000234469400010
公开日期	2012-02-07
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/3526]
专题	紫金山天文台_分子云与恒星形成研究团组
作者单位	1.Harvard Smithsonian Ctr Astrophys, Submillimeter Array, Hilo, HI 96720 USA 2.Natl Astron Observ, Mitaka, Tokyo 1818588, Japan 3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 5.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan 6.Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany
推荐引用方式 GB/T 7714	Sakamoto, K,Ho, PTP,Iono, D,et al. Molecular superbubbles in the starburst galaxy NGC 253[J]. ASTROPHYSICAL JOURNAL,2006,636(2):685-697.
APA	Sakamoto, K.,Ho, PTP.,Iono, D.,Keto, ER.,Mao, RQ.,...&Zhao, JH.(2006).Molecular superbubbles in the starburst galaxy NGC 253.ASTROPHYSICAL JOURNAL,636(2),685-697.
MLA	Sakamoto, K,et al."Molecular superbubbles in the starburst galaxy NGC 253".ASTROPHYSICAL JOURNAL 636.2(2006):685-697.