University of Hertfordshire

From the same journal

From the same journal

By the same authors

  • Y. Ao
  • Y. Matsuda
  • C. Henkel
  • D. Iono
  • D.~M. Alexander
  • S.~C. Chapman
  • B. Hatsukade
  • M. Hayes
  • N.~K. Hine
  • Y. Kato
  • R. Kawabe
  • K. Kohno
  • M. Kubo
  • M. Lehnert
  • M. Malkan
  • K.~M. Menten
  • T. Nagao
  • R.~P. Norris
  • M. Ouchi
  • T. Saito
  • Y. Tamura
  • Y. Taniguchi
  • H. Umehata
  • A. Weiss
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Original languageEnglish
Number of pages1
Pages (from-to)178
JournalThe Astrophysical Journal
Journal publication date30 Nov 2017
Early online date30 Nov 2017
Publication statusPublished - 30 Nov 2017


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.


© 2017. The American Astronomical Society. All rights reserved.

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