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

Journal
Date Issued
2017
Author(s)
Bradač, Maruša
•
Garcia-Appadoo, Diego
•
Huang, Kuang-Han
•
•
Quinn Finney, Emily
•
Hoag, Austin
•
Lemaux, Brian C.
•
Borello Schmidt, Kasper
•
Treu, Tommaso
•
Carilli, Chris
•
Dijkstra, Mark
•
Ferrara, Andrea
•
•
Jones, Tucker
•
Ryan, Russell
•
Wagg, Jeff
•
Gonzalez, Anthony H.
DOI
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}-0.3+0.2× {10}7 {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 ({{∆ }}v={20}-40+140 {km} {{{s}}}-1) between the Lyα and [C II] line is unusual, and may be indicative of ionizing photons escaping.

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.

Volume
836
Issue
1
Start page
L2
Uri
Url
Issn Identifier
2041-8205
Ads BibCode
2017ApJ...836L...2B
Rights
open.access
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