Powerful high-velocity dispersion molecular hydrogen associated with an intergalactic shock wave in Stephan's Quintet

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 星系中的恒星形成研究团组

	Powerful high-velocity dispersion molecular hydrogen associated with an intergalactic shock wave in Stephan's Quintet
	Appleton, PN ; Xu, KC ; Reach, W ; Dopita, MA ; Gao, Y; Lu, N ; Popescu, CC ; Sulentic, JW ; Tuffs, RJ ; Yun, MS
刊名	ASTROPHYSICAL JOURNAL
	2006-03-10
卷号	639 期号:2 页码:L51-L54
关键词	galaxies : evolution galaxies : individual ( NGC 7318b) galaxies : interactions intergalactic medium
ISSN号	0004-637X
英文摘要	We present the discovery of strong mid-infrared emission lines of molecular hydrogen of apparently highvelocity dispersion (similar to 870 km s(-1)) originating from a group-wide shock wave in Stephan's Quintet. These Spitzer Space Telescope observations reveal emission lines of molecular hydrogen and little else. This is the first time an almost pure H 2 line spectrum has been seen in an extragalactic object. Along with the absence of PAH-dust features and very low excitation ionized gas tracers, the spectra resemble shocked gas seen in Galactic supernova remnants, but on a vast scale. The molecular emission extends over 24 kpc along the X-ray-emitting shock front, but it has 10 times the surface luminosity as the soft X-rays and about one-third the surface luminosity of the IR continuum. We suggest that the powerful H-2 emission is generated by the shock wave caused when a highvelocity intruder galaxy collides with filaments of gas in the galaxy group. Our observations suggest a close connection between galaxy-scale shock waves and strong broad H-2 emission lines, like those seen in the spectra of ultraluminous infrared galaxies where high-speed collisions between galaxy disks are common.
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]	SPITZER-SPACE-TELESCOPE ; INFRARED SPECTROGRAPH IRS ; SPECTRAL SIGNATURES ; STAR-FORMATION ; EMISSION ; GALAXIES ; STARBURST ; NGC-6240
收录类别	SCI
语种	英语
WOS记录号	WOS:000235837200002
公开日期	2012-02-07
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/3530]
专题	紫金山天文台_星系中的恒星形成研究团组
作者单位	1.CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA 2.CALTECH, IPAC, Pasadena, CA 91125 USA 3.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 5.Max Planck Inst Kernphys, D-69117 Heidelberg, Germany 6.Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA 7.Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA
推荐引用方式 GB/T 7714	Appleton, PN,Xu, KC,Reach, W,et al. Powerful high-velocity dispersion molecular hydrogen associated with an intergalactic shock wave in Stephan's Quintet[J]. ASTROPHYSICAL JOURNAL,2006,639(2):L51-L54.
APA	Appleton, PN.,Xu, KC.,Reach, W.,Dopita, MA.,Gao, Y.,...&Yun, MS.(2006).Powerful high-velocity dispersion molecular hydrogen associated with an intergalactic shock wave in Stephan's Quintet.ASTROPHYSICAL JOURNAL,639(2),L51-L54.
MLA	Appleton, PN,et al."Powerful high-velocity dispersion molecular hydrogen associated with an intergalactic shock wave in Stephan's Quintet".ASTROPHYSICAL JOURNAL 639.2(2006):L51-L54.