ALMA [CII] detection of a redshift 7 lensed galaxy behind RXJ1347.1-1145

13 Jan 2017  ·  Bradač Maruša, Garcia-Appadoo Diego, Huang Kuang-Han, Vallini Livia, Finney Emily, Hoag Austin, Lemaux Brian, Schmidt Kasper, Treu Tommaso, Carilli Chris, Dijkstra Mark, Ferrara Andrea, Fontana Adriano, Jones Tucker, Ryan Russell, Wagg Jeff ·

We present the results of ALMA spectroscopic follow-up of a $z=6.765$ Lyman-$\alpha$ emitting galaxy behind the cluster RXJ1347-1145. We report the detection of [CII]158$\mu$m line fully consistent with the Lyman-$\alpha$ redshift and with the peak of the optical emission... Given the magnification of $\mu=5.0 \pm 0.3$ the intrinsic (corrected for lensing) luminosity of the [CII] line is $L_{[CII]} =1.4^{+0.2}_{-0.3} \times 10^7L_{\odot}$, which is ${\sim}5$ times fainter than other detections of $z\sim 7$ galaxies. The result indicates that low $L_{[CII]}$ in $z\sim 7$ galaxies compared to the local counterparts might be caused by their low metallicities and/or feedback. The small velocity off-set ($\Delta v = 20_{-40}^{+140} \rm km/s$) between the Lyman-$\alpha$ and [CII] line is unusual, and may be indicative of ionizing photons escaping. read more

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Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics