1. ALMA [C II] 158 μm Detection of a Redshift 7 Lensed Galaxy behind RX J1347.1-1145
- Author
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Bradač, M, Garcia-Appadoo, D, Huang, KH, Vallini, L, Finney, EQ, Hoag, A, Lemaux, BC, Schmidt, KB, Treu, T, Carilli, C, Dijkstra, M, Ferrara, A, Fontana, A, Jones, T, Ryan, R, Wagg, J, and Gonzalez, AH
- Subjects
dark ages ,reionization ,first stars ,galaxies: clusters: individual ,galaxies: high-redshift ,gravitational lensing: strong ,astro-ph.GA ,astro-ph.CO ,dark ages ,reionization ,first stars ,Astronomy & Astrophysics ,Astronomical and Space Sciences - Abstract
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 [C ii] = 1.4+0.2-0.3 × 107 L⊙, roughly ∼5 times fainter than other detections of z ∼ 7 galaxies. The result indicates that low L [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+140-40 Km s-1) between the Lyα and [C ii] line is unusual, and may be indicative of ionizing photons escaping.
- Published
- 2017