ALMA [C II] 158 mu m Detection of a Redshift 7 Lensed Galaxy behind RXJ1347.1-1145

作者：Bradac Marusa; 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

来源：Astrophysical Journal Letters, 2017, 836(1): L2.

DOI：10.3847/2041-8213/836/1/L2

• dark ages, reionization, first stars
• galaxies: clusters: individual (RX J1347.1-1145)
• galaxies: high-redshift
• gravitational lensing: strong

We present the results of ALMA spectroscopic follow-up of a z = 6.766 Ly alpha emitting galaxy behind the cluster RX J1347.1-1145. We report the detection of [C II] 158 mu m line fully consistent with the Ly alpha redshift and with the peak of the optical emission. Given the magnification of mu = 5.0 +/- 0.3, the intrinsic (corrected for lensing) luminosity of the [C II] line is L[C II]= 1.4(-0.3)(+0.3) x 10(7) L-circle dot, roughly similar to 5 times fainter than other detections of z similar to 7 galaxies. The result indicates that low L[C II] in z similar to 7 galaxies compared to the local counterparts might be caused by their low metallicities and/or feedback. The small velocity offset (Delta v = 20(-40)(+40) km s(-1)) between the Ly alpha and [C II] line is unusual, and may be indicative of ionizing photons escaping.

• 出版日期2017-2-10