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Brada, 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.
Astrophysical journal. Letters, 02/2017, Letnik: 836, Številka: 1Journal Article
We present the results of ALMA spectroscopic follow-up of a z = 6.766 Ly emitting galaxy behind the cluster RX J1347.1−1145. We report the detection of C ii 158 m line fully consistent with the Ly redshift and with the peak of the optical emission. Given the magnification of = 5.0 0.3, the intrinsic (corrected for lensing) luminosity of the C ii line is LC ii , roughly ∼5 times fainter than other detections of z ∼ 7 galaxies. The result indicates that low LC ii in z ∼ 7 galaxies compared to the local counterparts might be caused by their low metallicities and/or feedback. The small velocity offset ( ) between the Ly and C ii line is unusual, and may be indicative of ionizing photons escaping.
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