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What powers Ly alpha blobs?
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
AbstractLy 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.
KeywordGalaxies: Formation Galaxies: High-redshift Galaxies: Ism Galaxies: Active Infrared: Galaxies
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000361803900132
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Document Type期刊论文
Affiliation1.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
Recommended Citation
GB/T 7714
Ao, Y.,Matsuda, Y.,Beelen, A.,et al. What powers Ly alpha blobs?[J]. ASTRONOMY & ASTROPHYSICS,2015,581.
APA Ao, Y..,Matsuda, Y..,Beelen, A..,Henkel, C..,Cen, R..,...&Zheng, Z..(2015).What powers Ly alpha blobs?.ASTRONOMY & ASTROPHYSICS,581.
MLA Ao, Y.,et al."What powers Ly alpha blobs?".ASTRONOMY & ASTROPHYSICS 581(2015).
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