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SUMMARY:A 3D View of the Dark Universe: illuminating intergalactic gas wit
 h fluorescent Lyman-alpha emission - Sebastiano Cantalupo (ETH Zurich\, In
 stitute for Astronomy)
DTSTART:20170209T160000Z
DTEND:20170209T170000Z
UID:TALK70212@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:Gravitational collapse during the Universe's first billion yea
 rs transformed a nearly homogeneous matter distribution into a network of 
 filaments - the Cosmic Web - where galaxies form and evolve.\nBecause most
  of this material is too diffuse to form stars\, its study has been limite
 d so far to absorption probes against background sources. In this talk\, I
  will present the results of a new\nprogram to directly detect and study h
 igh-redshift cosmic gas in emission using bright quasars and galaxies as e
 xternal "sources of illumination". In particular\, I will show results fro
 m\nultra-deep narrow-band imaging and recent integral-field-spectroscopy a
 s a part of the MUSE Guaranteed Time of Observation program that revealed 
 numerous giant Lyman-alpha emitting filaments\nextending up to several hun
 dred kpc around quasars and bright galaxies. I will discuss how the unexpe
 ctedly high luminosities of these systems\, together with the constraints 
 from Helium and metal\nextended emission\, represent a challenge for our c
 urrent understanding of cosmological structure formation. In particular\, 
 I will show that current observations suggest that a large amount of\n"col
 d" and dense gaseous "clumps" should be present around high-redshift galax
 ies and I will present our first attempts to understand the origin and nat
 ure of these structures using high-resolution\nhydrodynamical simulations.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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