| Title | Discovery of a Ly alpha-emitting Dark Cloud within the z similar to 2.8 SMMJ02399-0136 System |
| Authors | Li, Qiong Cai, Zheng Prochaska, J. Xavier Battaia, Fabrizio Arrigoni Ivison, R. J. Falgarone, Edith Cantalupo, Sebastiano Matuszewski, Mateusz Neill, James Don Wang, Ran Martin, Chris Moore, Anna |
| Affiliation | Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China Univ Calif Santa Cruz, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA Univ Tokyo, Kavli Inst Phys & Math Universe Kavli IPMU, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan Univ Tokyo, WPI, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany Univ Edinburgh, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland Univ Paris Diderot, Sorbonne Univ, Univ PSL, Lab Phys,ENS,CNRS, Paris, France Swiss Fed Inst Technol, Dept Phys, CH-8093 Zurich, Switzerland CALTECH, Cahill Ctr Astrophys, 1216 East Calif Blvd,Mail Code 278-17, Pasadena, CA 91125 USA |
| Keywords | cosmology: observations galaxies: formation galaxies: high-redshift intergalactic medium quasars: general |
| Issue Date | 2019 |
| Publisher | ASTROPHYSICAL JOURNAL |
| Abstract | We present Keck/Keck Cosmic Web Imager (KCWI) integral field spectrograph observations of the complex system surrounding SMMJ02399-0136 (a lensed z=2.8 sub-mm galaxy), including an associated Ly alpha nebula, a dust-obscured, broad-absorption-line quasar, and neighboring galaxies. At a 3 sigma surface brightness contour of 1.6 x 10(-17) erg s(-1) cm(-2) arcsec(-2), the Ly alpha nebula extends over 17 arcsec (greater than or similar to 140 physical kpc) and has a total Ly alpha luminosity of 2.5 x 10(44) erg s(-1) (uncorrected for lensing). The nebula exhibits a kinematic shear of similar to 1000 km s(-1) over 100 pkpc with lowest velocities east of SMMJ02399-0136 and increasing to the southwest. We also discover a bright, Lya emitter, separated spatially and kinematically from the nebula, at a projected separation of approximate to 60 kpc from the quasar. This source has no clear central counterpart in deep Hubble Space Telescope imaging, giving an intrinsic Ly alpha rest-frame equivalent width greater than 312 angstrom (5 sigma). 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., Ly beta, He II, C IV, etc, and with polarimetry will further reveal the origin of the Lya nebula and nature of the dark cloud. |
| URI | http://hdl.handle.net/20.500.11897/549023 |
| ISSN | 0004-637X |
| DOI | 10.3847/1538-4357/ab0e6f |
| Indexed | SCI(E) EI |
| Appears in Collections: | 科维理天文与天体物理研究所 |
