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

Umehata, Hideki and Matsuda, Yuichi and Tamura, Yoichi and Kohno, Kotaro and Smail, Ian and Ivison, R. J. and Steidel, Charles C. and Chapman, Scott C. and Geach, James E. and Hayes, Matthew and Nagao, Tohru and Ao, Yiping and Kawabe, Ryohei and Yun, Min S. and Hatsukade, Bunyo and Kubo, Mariko and Kato, Yuta and Saito, Tomoki and Ikarashi, Soh and Nakanishi, Kouichiro and Lee, Minju and Izumi, Takuma and Mori, Masao and Ouchi, Masami (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). Art. No. L16. ISSN 2041-8205. doi:10.3847/2041-8213/834/2/L16.

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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 z_(spec) ≃ 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])/L_(IR) ≈ 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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URLURL TypeDescription Paper
Umehata, Hideki0000-0003-1937-0573
Matsuda, Yuichi0000-0003-1747-2891
Tamura, Yoichi0000-0003-4807-8117
Kohno, Kotaro0000-0002-4052-2394
Smail, Ian0000-0003-3037-257X
Ivison, R. J.0000-0001-5118-1313
Steidel, Charles C.0000-0002-4834-7260
Chapman, Scott C.0000-0002-8487-3153
Geach, James E.0000-0003-4964-4635
Hayes, Matthew0000-0001-8587-218X
Nagao, Tohru0000-0002-7402-5441
Ao, Yiping0000-0003-3139-2724
Kawabe, Ryohei0000-0002-8049-7525
Yun, Min S.0000-0001-7095-7543
Hatsukade, Bunyo0000-0001-6469-8725
Kubo, Mariko0000-0002-7598-5292
Nakanishi, Kouichiro0000-0002-6939-0372
Ouchi, Masami0000-0002-1049-6658
Additional Information:© 2017. The American Astronomical Society. Received 2016 December 2. Accepted 2016 December 27. Published 2017 January 12. We greatly appreciate the anonymous referee for a helpful report. H.U. is supported by the ALMA Japan Research Grant of NAOJ Chile Observatory, NAOJ-ALMA-0071, 0131, 140, and 0152. H.U. is supported by JSPS Grant-in-Aid for Research Activity Start-up (16H06713). H.U. is thankful for the support from JSPS KAKENHI No. 16H02166 (PI: Y. Taniguchi). Y.T. is supported by JSPS KAKENHI No. 25102073. R.J.I. acknowledges support from ERC in the form of the Advanced Investigator Programme, 321302, COSMICISM. I.R.S. acknowledges support from STFC (ST/L00075X/1). I.R.S. acknowledges support from the ERC Advanced Investigator program DUSTYGAL 321334, and a Royal Society/Wolfson Merit Award. M.H. acknowledges the support of the Swedish Research Council, Vetenskapsrådet and the Swedish National Space Board (SNSB), and is Fellow of the Knut and Alice Wallenberg Foundation. This Letter makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00159.S, ADS/JAO.ALMA#2013.1.00704.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. Facility: ALMA.
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
National Astronomical Observatory of JapanNAOJ-ALMA-0071
National Astronomical Observatory of JapanNAOJ-ALMA-0131
National Astronomical Observatory of JapanNAOJ-ALMA-140
National Astronomical Observatory of JapanNAOJ-ALMA-0152
Japan Society for the Promotion of Science (JSPS)16H06713
Japan Society for the Promotion of Science (JSPS)16H02166
Japan Society for the Promotion of Science (JSPS)25102073
European Research Council (ERC)321302
Science and Technology Facilities Council (STFC)ST/L00075X/1
European Research Council (ERC)DUSTYGAL 321334
Swedish Research CouncilUNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Knut and Alice Wallenberg FoundationUNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: halos; galaxies: high-redshift; galaxies: ISM; submillimeter: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20170120-133954598
Persistent URL:
Official Citation:Hideki Umehata et al 2017 ApJL 834 L16
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73590
Deposited On:22 Jan 2017 16:52
Last Modified:06 May 2022 22:56

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