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ALMA [C II] 158 μm Detection of a Redshift 7 Lensed Galaxy behind RX J1347.1-1145
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Dipartimento di Fisica e Astronomia, Italy.
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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 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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 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:kth:diva-208113DOI: 10.3847/2041-8213/836/1/L2ISI: 000401605200002Scopus ID: 2-s2.0-85013177877OAI: oai:DiVA.org:kth-208113DiVA: diva2:1110149
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QC 20170615

Available from: 2017-06-15 Created: 2017-06-15 Last updated: 2017-06-15Bibliographically approved

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