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ALMA [C ii] 158 μm Detection of a Redshift 7 Lensed Galaxy behind RX J1347.1−1145* * These observations are based on the following ALMA data: ADS/JAO.ALMA#2015.1.00091.S. They are also associated with programs Spitzer #90009, 60034, 00083, 50610, 03550, 40593, and HST # GO10492, GO11591, GO12104, and GO13459. Furthermore based on multi-year KECK programs.
- Bradač, Maruša;
- Garcia-Appadoo, Diego;
- Huang, Kuang-Han;
- Vallini, Livia;
- Finney, Emily Quinn;
- Hoag, Austin;
- Lemaux, Brian C;
- Schmidt, Kasper Borello;
- Treu, Tommaso;
- Carilli, Chris;
- Dijkstra, Mark;
- Ferrara, Andrea;
- Fontana, Adriano;
- Jones, Tucker;
- Ryan, Russell;
- Wagg, Jeff;
- Gonzalez, Anthony H
- et al.
Published Web Location
https://doi.org/10.3847/2041-8213/836/1/l2Abstract
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.
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