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题名: What powers Ly alpha blobs?
作者: Ao, Y.1, 2; Matsuda, Y.1; Beelen, A.3; Henkel, C.4, 5; Cen, R.6; De Breuck, C.7; Francis, P. J.8; Kovacs, A.9; Lagache, G.10; Lehnert, M.11, 12; Mao, M. Y.13, 14, 15; Menten, K. M.4; Norris, R. P.14; Omont, A.11, 12; Tatemastu, K.1; Weiss, A.4; Zheng, Z.16
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 2015-09-01
卷号: 581
关键词: galaxies: formation ; galaxies: high-redshift ; galaxies: ISM ; galaxies: active ; infrared: galaxies
学科分类: 天文和天体物理
DOI: 10.1051/0004-6361/201424165
文章类型: Article
英文摘要: Ly alpha blobs (LABs) are spatially extended Ly alpha nebulae seen at high redshift. The origin of Ly alpha 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 mu Jy and 77 +/- 16 mu Jy, respectively, and B5 is marginally detected at 3 sigma (51 +/- 16 mu Jy). 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(-0:35)(+0:30) for B6 and 2.20(-0:30)(+0:45) for B7, which are consistent with the redshift of the Ly alpha 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 Ly alpha 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.
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 GALAXIES ; BROAD-BAND SURVEY ; EQUAL-TO 2.3 ; HIGH-REDSHIFT ; EMITTING GALAXIES ; COLD ACCRETION ; RADIO GALAXIES ; MASSIVE GALAXY ; DEEP SURVEY ; Z=3.1
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000361803900132
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14818
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Paris 11, Inst Astrophys Spatiale, F-91405 Orsay, France
4.MPIfR, D-53121 Bonn, Germany
5.King Abdulaziz Univ, Dept Astron, Jeddah 21589, Saudi Arabia
6.Princeton Univ Observ, Princeton, NJ 08544 USA
7.European So Observ, D-85748 Garching, Germany
8.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia
9.CALTECH, Pasadena, CA 91125 USA
10.Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France
11.CNRS, Inst Astrophys Paris, F-75014 Paris, France
12.Univ Paris 06, F-75014 Paris, France
13.Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia
14.VLBI, Joint Inst, NL-7990 AA Dwingeloo, Netherlands
15.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
16.Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
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