[Astronomy seminar] Astronomy Seminar on Friday 6 October

[Astronomy seminar announcements]

Reminder!


On 2017-10-02 06:47, Matthew Hayes wrote:
> All,
>
> The next Astronomy seminar will be:
>
> *** Friday 6 of October from 10:30 to 11:30 at FC 61 ***
>
> Welcome.
>
>
> Title: Illuminating the Dark Universe with fluorescent Lyman-alpha emission
>
> Speaker: Sebastiano Cantalupo, ETH Zürich
>
> Abstract: Gravitational collapse during the Universe's first billion
> years transformed a nearly homogeneous matter distribution into a
> network of filaments - the Cosmic Web - where galaxies form and evolve.
> Because most of this material is too diffuse to form stars, its study
> has been limited so far to absorption probes against background sources.
> In this talk, I will present the results of a new program to directly
> detect and study high-redshift cosmic gas in emission using bright
> quasars and galaxies as external "sources of illumination’’. In
> particular, I will show results from ultra-deep narrow-band imaging and
> recent integral-field-spectroscopy as a part of the MUSE Guaranteed Time
> of Observation program that revealed numerous giant Lyman-alpha emitting
> filaments extending up to several hundred kpc around quasars and bright
> galaxies. I will discuss how the unexpectedly high luminosities of these
> systems, together with the constraints from Helium and metal extended
> emission, represent a challenge for our current understanding of
> cosmological structure formation. In particular, I will show that
> current observations suggest that a large amount of “cold" and dense
> gaseous “clumps" should be present around high-redshift galaxies and I
> will present our first attempts to understand the origin and nature of
> these structures using high-resolution hydrodynamical simulations.

-- 
Matthew Hayes
Wallenberg Academy Fellow          email: matthew at astro.su.se
Stockholm University                 tel: +46 (0)8 5537 8521
Department of Astronomy & OKC        fax: +46 (0)8 5537 8510
AlbaNova University Centre          inst: www.astro.su.se
SE-106 91 Stockholm             personal: www.xayes.org/pub/
Sweden                             skype: matthewhayes