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Discovery of a Lyα-emitting Dark Cloud within the z ∼ 2.8 SMM J02399-0136 System

Li, Qiong and Cai, Zheng and Prochaska, J. Xavier and Arrigoni-Battaia, Fabrizio and Ivison, R. J. and Falgarone, Edith and Cantalupo, Sebastiano and Matuszewski, Mateusz and Neill, James Don and Wang, Ran and Martin, Christopher and Moore, Anna (2019) Discovery of a Lyα-emitting Dark Cloud within the z ∼ 2.8 SMM J02399-0136 System. Astrophysical Journal, 875 (2). Art. No. 130. ISSN 1538-4357. doi:10.3847/1538-4357/ab0e6f.

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We present Keck/Keck Cosmic Web Imager (KCWI) integral field spectrograph observations of the complex system surrounding SMM J02399−0136 (a lensed z = 2.8 sub-mm galaxy), including an associated Lyα nebula, a dust-obscured, broad-absorption-line quasar, and neighboring galaxies. At a 3σ surface brightness contour of 1.6 × 10^(−17) erg s^(−1) cm^(−2) arcsec^(−2), the Lyα nebula extends over 17 arcsec (≳ 140 physical kpc) and has a total Lyα luminosity of 2.5 × 10^(44) erg s^(-1) (uncorrected for lensing). The nebula exhibits a kinematic shear of ~ 1000 km s^(-1) over 100 pkpc with lowest velocities east of SMM J02399−0136 and increasing to the southwest. We also discover a bright, Lyα emitter, separated spatially and kinematically from the nebula, at a projected separation of ≈60 kpc from the quasar. This source has no clear central counterpart in deep Hubble Space Telescope imaging, giving an intrinsic Lyα rest-frame equivalent width greater than 312 Å (5σ). We argue that this "dark cloud" is illuminated by the quasar with a UV flux that is orders of magnitude brighter than the emission along our sightline. This result confirms statistical inferences that luminous quasars at z > 2 emit UV radiation anisotropically. Future KCWI observations of other lines, e.g., Lyβ, He ii, C iv, etc, and with polarimetry will further reveal the origin of the Lyα nebula and nature of the dark cloud.

Item Type:Article
Related URLs:
URLURL TypeDescription
Li, Qiong0000-0002-3119-9003
Cai, Zheng0000-0001-8467-6478
Prochaska, J. Xavier0000-0002-7738-6875
Arrigoni-Battaia, Fabrizio0000-0002-4770-6137
Ivison, R. J.0000-0001-5118-1313
Cantalupo, Sebastiano0000-0001-5804-1428
Neill, James Don0000-0002-0466-1119
Wang, Ran0000-0003-4956-5742
Martin, Christopher0000-0002-8650-1644
Moore, Anna0000-0002-2894-6936
Additional Information:© 2019. The American Astronomical Society. Received 2018 April 9; revised 2019 March 6; accepted 2019 March 7; published 2019 April 23. This work was supported by National Key Program for Science and Technology Research and Development (grant 2016YFA0400703) and the National Science Foundation of China (11721303). We are thankful for the support from the National Science Foundation of China (NSFC) grants No. 11373008, 11533001. Q.L. gratefully acknowledges financial support from China Scholarship Council. Z.C. acknowledges the supports provided by NASA through the Hubble Fellowship grant HST-HF2-51370 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. E.F. gratefully acknowledges funding from the European Research Council, under the European Community's Seventh framework Programme, through the Advanced Grant MIST (FP7/2017-2022, No. 742719). S.C. gratefully acknowledges support from Swiss National Science Foundation grant PP00P2_163824. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
National Key Basic Research Program of China2016YFA0400703
National Natural Science Foundation of China11721303
National Natural Science Foundation of China11373008
National Natural Science Foundation of China11533001
China Scholarship CouncilUNSPECIFIED
NASA Hubble FellowshipHST-HF2-51370
NASANAS 5-26555
European Research Council (ERC)742719
Swiss National Science Foundation (SNSF)PP00P2_163824
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:cosmology: observations; galaxies: formation; galaxies: high-redshift; intergalactic medium; quasars: general
Issue or Number:2
Record Number:CaltechAUTHORS:20190423-095739444
Persistent URL:
Official Citation:Qiong Li et al 2019 ApJ 875 130
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94889
Deposited By: George Porter
Deposited On:23 Apr 2019 17:14
Last Modified:16 Nov 2021 17:08

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