Deep Submillimeter and Radio Observations in the SSA22 Field. I. Powering Sources and the Lyα Escape Fraction of Lyα Blobs
Ao,Y.1,2; Matsuda,Y.1; Henkel,C.3,4; Iono,D.1; Alexander,D. M.5; Chapman,S. C.6; Geach,J.7; Hatsukade,B.8; Hayes,M.9; Hine,N. K.10; Kato,Y.1,11; Kawabe,R.1; Kohno,K.8; Kubo,M.1; Lehnert,M.12; Malkan,M.13; Menten,K. M.3; Nagao,T.14; Norris,R. P.15,16; Ouchi,M.17; Saito,T.18; Tamura,Y.8,19; Taniguchi,Y.20; Umehata,H.20; Weiss,A.3
Source PublicationThe Astrophysical Journal
AbstractAbstract We study the heating mechanisms and Lyα escape fractions of 35 Lyα blobs (LABs) at z?≈?3.1 in the SSA22 field. Dust continuum sources have been identified in 11 of the 35 LABs, all with star formation rates (SFRs) above 100 M⊙ yr?1. Likely radio counterparts are detected in 9 out of 29 investigated LABs. The detection of submillimeter dust emission is more linked to the physical size of the Lyα emission than to the Lyα luminosities of the LABs. A radio excess in the submillimeter/radio-detected LABs is common, hinting at the presence of active galactic nuclei. Most radio sources without X-ray counterparts are located at the centers of the LABs. However, all X-ray counterparts avoid the central regions. This may be explained by absorption due to exceptionally large column densities along the line-of-sight or by LAB morphologies, which are highly orientation dependent. The median Lyα escape fraction is about 3% among the submillimeter-detected LABs, which is lower than a lower limit of 11% for the submillimeter-undetected LABs. We suspect that the large difference is due to the high dust attenuation supported by the large SFRs, the dense large-scale environment as well as large uncertainties in the extinction corrections required to apply when interpreting optical data.
Keywordgalaxies: active galaxies: formation galaxies: high-redshift galaxies: ISM infrared: galaxies
WOS IDIOP:0004-637X-850-2-aa960f
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
2.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
3.MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
4.Astron. Dept., King Abdulaziz Univ., P.O. Box 80203, Jeddah 21589, Saudi Arabia
5.Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
6.Dept. of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 4R2, Canada
7.Centre for Astrophysics Research, University of Hertfordshire, Hatfield, AL10 9AB, UK
8.Institute of Astronomy, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
9.Stockholm University, Department of Astronomy and Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, SE-10691, Stockholm, Sweden
10.Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB, UK
11.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 133-0033, Japan
12.Institut d’Astrophysique de Paris, CNRS and Université Pierre et Marie Curie, 98bis Bd Arago, F-75014 Paris, France
13.Department of Physics & Astronomy, University of California, Los Angeles, CA 90095, USA
14.Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho 2-5, Matsuyama, Ehime 790-8577, Japan
15.CSIRO Australia Telescope National Facility, P.O. Box 76, Epping, NSW 1710, Australia
16.Western Sydney University, Locked Bag 1797, Penrith South, NSW 1797, Australia
17.Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa City, Chiba 277-8582, Japan
18.Nishi-Harima Astronomical Observatory, Centre for Astronomy, University of Hyogo, 407-2 Nichigaichi, Sayo-cho, Sayo, Hyogo 679-5313, Japan
19.Department of Physics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
20.The Open University of Japan, 2-11, Wakaba, Mihama-ku, Chiba, 261-8586, Japan
Recommended Citation
GB/T 7714
Ao,Y.,Matsuda,Y.,Henkel,C.,et al. Deep Submillimeter and Radio Observations in the SSA22 Field. I. Powering Sources and the Lyα Escape Fraction of Lyα Blobs[J]. The Astrophysical Journal,2017,850(2).
APA Ao,Y..,Matsuda,Y..,Henkel,C..,Iono,D..,Alexander,D. M..,...&Weiss,A..(2017).Deep Submillimeter and Radio Observations in the SSA22 Field. I. Powering Sources and the Lyα Escape Fraction of Lyα Blobs.The Astrophysical Journal,850(2).
MLA Ao,Y.,et al."Deep Submillimeter and Radio Observations in the SSA22 Field. I. Powering Sources and the Lyα Escape Fraction of Lyα Blobs".The Astrophysical Journal 850.2(2017).
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