What powers Ly α blobs?

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

	What powers Ly α blobs?
	Ao, Y., ; Matsuda, Y. ; Beelen, A. ; Henkel, C., ; Cen, R. ; De Breuck, C. ; Francis, P.J. ; Kovács, A. ; Lagache, G.0 ; Lehnert, M. ; Mao, M.Y.,, ; Menten, K.M. ; Norris, R.P. ; Omont, A. ; Tatemastu, K. ; Weiß, A. ; Zheng, Z.
刊名	Astronomy and Astrophysics
	2015
卷号	581
英文摘要	Lyα blobs (LABs) are spatially extended Lyα? nebulae seen at high redshift. The origin of Lyα emission in the LABs is still unclear and under debate. To study their heating mechanism(s), we present Australia Telescope Compact Array (ATCA) observations of the 20 cm radio emission and Herschel PACS and SPIRE measurements of the far-infrared (FIR) emission toward the four LABs in the protocluster J2143-4423 at z = 2.38. Among the four LABs, B6 and B7 are detected in the radio with fluxes of 67±17 μJy and 77±16 μJy, respectively, and B5? is marginally detected at 3σ (51±16 μJy). For all detected sources, their radio positions are consistent with the central positions of the LABs. Among them, B6 and B7 are obviously also detected in the FIR. By fitting the data with different templates, we obtained redshifts of 2.20+0.30-0.35 for B6 and 2.20+0.45-0.30 for B7, which are consistent with the redshift of the Lyα emission within uncertainties, indicating that both FIR sources are likely associated with the LABs. The associated FIR emission in B6 and B7 and high star formation rates strongly favor star formation in galaxies as an important powering source for the Lyα emission in both LABs. However, the other two, B1 and B5, are predominantly driven by the active galactic nuclei or other sources of energy still to be specified, but not mainly by star formation. In general, the LABs are powered by quite diverse sources of energy. © ESO, 2015.
学科主题	天文和天体物理
收录类别	SCI
语种	英语
公开日期	2015-12-24
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/14825]
专题	紫金山天文台_分子云与恒星形成研究团组
推荐引用方式 GB/T 7714	Ao, Y.,,Matsuda, Y.,Beelen, A.,et al. What powers Ly α blobs?[J]. Astronomy and Astrophysics,2015,581.
APA	Ao, Y.,.,Matsuda, Y..,Beelen, A..,Henkel, C.,.,Cen, R..,...&Zheng, Z..(2015).What powers Ly α blobs?.Astronomy and Astrophysics,581.
MLA	Ao, Y.,,et al."What powers Ly α blobs?".Astronomy and Astrophysics 581(2015).