ALMA Reveals Strong [C II] Emission in a Galaxy Embedded in a Giant Lyα Blob at z = 3.1

Umehata, H.; Matsuda, Y.; Tamura, Y.; Kohno, K.; Smail, I.; Ivison, R.J.; Steidel, C.C.; Chapman, S.C.; Geach, J.E.; Hayes, M.; Nagao, T.; Ao, Y.; Kawabe, R.; Yun, M.S.; Hatsukade, B.; Kubo, M.; Kato, Y.; Saito, T.; Ikarashi, S.; Nakanishi, K.; Lee, M.; Izumi, T.; Mori, M.; Ouchi, M.

doi:10.3847/2041-8213/834/2/l16

ALMA Reveals Strong [C II] Emission in a Galaxy Embedded in a Giant Lyα Blob at z = 3.1

Umehata, H.; Matsuda, Y.; Tamura, Y.; Kohno, K.; Smail, I.; Ivison, R.J.; Steidel, C.C.; Chapman, S.C.; Geach, J.E.; Hayes, M.; Nagao, T.; Ao, Y.; Kawabe, R.; Yun, M.S.; Hatsukade, B.; Kubo, M.; Kato, Y.; Saito, T.; Ikarashi, S.; Nakanishi, K.; Lee, M.; Izumi, T.; Mori, M.; Ouchi, M.

Authors

H. Umehata

Y. Matsuda

Y. Tamura

K. Kohno

Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor

R.J. Ivison

C.C. Steidel

S.C. Chapman

J.E. Geach

M. Hayes

T. Nagao

Y. Ao

R. Kawabe

M.S. Yun

B. Hatsukade

M. Kubo

Y. Kato

T. Saito

S. Ikarashi

K. Nakanishi

M. Lee

T. Izumi

M. Mori

M. Ouchi

Abstract

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.

Citation

Umehata, H., Matsuda, Y., Tamura, Y., Kohno, K., Smail, I., Ivison, R., …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), Article L16. https://doi.org/10.3847/2041-8213/834/2/l16

Journal Article Type	Article
Acceptance Date	Dec 27, 2016
Online Publication Date	Jan 12, 2017
Publication Date	Jan 12, 2017
Deposit Date	Feb 22, 2017
Publicly Available Date	Mar 7, 2017
Journal	Astrophysical Journal Letters
Print ISSN	2041-8205
Electronic ISSN	2041-8213
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	834
Issue	2
Article Number	L16
DOI	https://doi.org/10.3847/2041-8213/834/2/l16