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

Journal Article · Tue Jan 10 04:00:00 EST 2017 · Astrophysical Journal Letters

DOI:https://doi.org/10.3847/2041-8213/834/2/L16· OSTI ID:22869517

Umehata, Hideki ^[1]; Matsuda, Yuichi; Ao, Yiping; Kawabe, Ryohei; Hatsukade, Bunyo; Kubo, Mariko; Kato, Yuta; Nakanishi, Kouichiro ^[2]; Tamura, Yoichi; Kohno, Kotaro ^[3]; Smail, Ian ^[4]; Ivison, R. J. ^[5]; Steidel, Charles C. ^[6]; Chapman, Scott C. ^[7]; Geach, James E. ^[8]; Hayes, Matthew ^[9]; Nagao, Tohru ^[10]; Yun, Min S. ^[11]; Saito, Tomoki ^[12]; Ikarashi, Soh ^[13] ; others, and

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1. The Open University of Japan, 2-11 Wakaba, Mihama-ku, Chiba 261-8586 (Japan)
2. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
3. Institute of Astronomy, School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015 (Japan)
4. Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham DH1 3LE (United Kingdom)
5. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching (Germany)
6. California Institute of Technology, MS 249-17, Pasadena, CA 91125 (United States)
7. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 4R2 (Canada)
8. Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom)
9. Department of Astronomy, Oskar Klein Centre, Stockholm University, AlbaNova University Centre, SE-106 91 Stockholm (Sweden)
10. Research Center for Space and Cosmic Evolution, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577 (Japan)
11. Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States)
12. Nishi-Harima Astronomical Observatory, Centre for Astronomy, University of Hyogo, 407-2 Nishigaichi, Sayo-cho, Sayo, Hyogo 679-5313 (Japan)
13. Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700AV Groningen (Netherlands)

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{sub 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{sub [C ii]}/L{sub IR} ≈ 0.01) and an extremely high [C ii] 158 μm and [N ii] 205 μm emission line ratio (L{sub [C ii]}/L{sub [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.

• OSTI ID: 22869517
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 2 Vol. 834; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC DUST
FINE STRUCTURE
GALAXIES
LUMINOSITY
LYMAN LINES
METALLICITY
PHOTOLYSIS
RED SHIFT
SHOCK HEATING
STARS