ALMA [C ii] 158 μm detection of a redshift 7 lensed galaxy behind RX J1347.1-1145

Journal Article · Fri Feb 10 04:00:00 EST 2017 · Astrophysical Journal Letters

DOI:https://doi.org/10.3847/2041-8213/836/1/L2· OSTI ID:22869472

Bradač, Maruša; Huang, Kuang-Han; Finney, Emily Quinn; Hoag, Austin; Lemaux, Brian C.; Jones, Tucker ^[1]; Garcia-Appadoo, Diego ^[2]; Vallini, Livia ^[3]; Schmidt, Kasper Borello ^[4]; Treu, Tommaso ^[5]; Carilli, Chris ^[6]; Dijkstra, Mark ^[7]; Ferrara, Andrea ^[8]; Fontana, Adriano ^[9]; Ryan, Russell ^[10]; Wagg, Jeff ^[11]

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1. Department of Physics, University of California, Davis, CA 95616 (United States)
2. Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago (Chile)
3. Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm (Sweden)
4. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam (Germany)
5. Department of Physics and Astronomy, UCLA, Los Angeles, CA, 90095-1547 (United States)
6. National Radio Astronomy Observatory, P. O. Box 0, Socorro, NM 87801 (United States)
7. Institute of Theoretical Astrophysics, University of Oslo, Postboks 1029 Blindern, NO-0315 Oslo (Norway)
8. Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa (Italy)
9. INAF—Osservatorio Astronomico di Roma, Via Frascati 33-00040, Monte Porzio Catone, I-00040 Rome (Italy)
10. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
11. Square Kilometre Array Organisation, Lower Withington, Cheshire (United Kingdom)

We present the results of ALMA spectroscopic follow-up of a z = 6.766 Lyα emitting galaxy behind the cluster RX J1347.1−1145. We report the detection of [C ii] 158 μm line fully consistent with the Lyα redshift and with the peak of the optical emission. Given the magnification of μ = 5.0 ± 0.3, the intrinsic (corrected for lensing) luminosity of the [C ii] line is L {sub [C ii]} = 1.4{sub −0.3}{sup +0.2}×10{sup 7} L{sub ⊙}, roughly ∼5 times fainter than other detections of z ∼ 7 galaxies. The result indicates that low L {sub [C ii]} in z ∼ 7 galaxies compared to the local counterparts might be caused by their low metallicities and/or feedback. The small velocity offset (Δv=20{sub −40}{sup +140} km s{sup −1}) between the Lyα and [C ii] line is unusual, and may be indicative of ionizing photons escaping.

• OSTI ID: 22869472
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 836; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
EMISSION
GALAXIES
GRAVITATIONAL LENSES
LUMINOSITY
METALLICITY
PHOTONS
RED SHIFT
SPECTROSCOPY