Astrophys. J., 875, 130-130 (2019/April-3)
Discovery of a Lyα-emitting dark cloud within the z ∼ 2.8 SMM J02399-0136 system.
LI Q., CAI Z., PROCHASKA J.X., BATTAIA F.A., IVISON R.J., FALGARONE E., CANTALUPO S., MATUSZEWSKI M., NEILL J.D., WANG R., MARTIN C. and MOORE A.
Abstract (from CDS):
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 x 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 2.5×1044ergs–1 (uncorrected for lensing). The nebula exhibits a kinematic shear of ∼1000kms–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.
© 2019. The American Astronomical Society. All rights reserved.
cosmology: observations - galaxies: formation - galaxies: high-redshift - intergalactic medium - quasars: general
Fig. 1, Table 1: [ISL98] LN (No. L3) added.
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