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ALMA reveals strong [C II] emission in a galaxy embedded in a giant Lyα Blob at z = 3.1.

Umehata, H. and Matsuda, Y. and Tamura, Y. and Kohno, K. and Smail, I. and Ivison, R.J. and Steidel, C.C. and Chapman, S.C. and Geach, J.E. and Hayes, M. and Nagao, T. and Ao, Y. and Kawabe, R. and Yun, M.S. and Hatsukade, B. and Kubo, M. and Kato, Y. and Saito, T. and Ikarashi, S. and Nakanishi, K. and Lee, M. and Izumi, T. and Mori, M. and Ouchi, M. (2017) 'ALMA reveals strong [C II] emission in a galaxy embedded in a giant Lyα Blob at z = 3.1.', Astrophysical journal letters., 834 (2). L16.


We report the result from observations conducted with the Atacama Large Millimeter/submillimeter Array (ALMA) to detect [C ii] 158 μm fine structure line emission from galaxies embedded in one of the most spectacular Lyα blobs (LABs) at z = 3.1, SSA22-LAB1. Of three dusty star-forming galaxies previously discovered by ALMA 860 μm dust continuum survey toward SSA22-LAB1, we detected the [C ii] line from one, LAB1-ALMA3 at z = 3.0993 ± 0.0004. No line emission was detected, associated with the other ALMA continuum sources or from three rest-frame UV/optical selected zspec sime 3.1 galaxies within the field of view. For LAB1-ALMA3, we find relatively bright [C ii] emission compared to the infrared luminosity (L[C ii]/LIR ≈ 0.01) and an extremely high [C ii] 158 μm and [N ii] 205 μm emission line ratio (L[C ii]/L[N ii] > 55). The relatively strong [C ii] emission may be caused by abundant photodissociation regions and sub-solar metallicity, or by shock heating. The origin of the unusually strong [C ii] emission could be causally related to the location within the giant LAB, although the relationship between extended Lyα emission and interstellar medium conditions of associated galaxies is yet to be understand.

Item Type:Article
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Publisher statement:© 2017. The American Astronomical Society. All rights reserved.
Date accepted:27 December 2016
Date deposited:07 March 2017
Date of first online publication:12 January 2017
Date first made open access:07 March 2017

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