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ALMA [C II] 158 mu m Detection of a Redshift 7 Lensed Galaxy behind RXJ1347.1-1145
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Dipartimento di Fisica e Astronomia, Bologna, Italy; INAF, Osservatorio Astronomico di Bologna, Italy.
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Number of Authors: 17
2017 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 836, no 1, L2Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 836, no 1, L2
Keyword [en]
dark ages, reionization, first stars, galaxies: clusters: individual (RX J1347.1-1145), galaxies: high-redshift, gravitational lensing: strong
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-144590DOI: 10.3847/2041-8213/836/1/L2ISI: 000401605200002OAI: oai:DiVA.org:su-144590DiVA: diva2:1116059
Available from: 2017-06-27 Created: 2017-06-27 Last updated: 2017-06-27Bibliographically approved

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