XXIVth IAP Colloquium

Far away : light in the young universe at redshift beyond three

Monday July 7 to Friday July 11, 2008

List of NORTH's Presentation(s) ( Updated 20/01/2011 15:08:18 )

Precise if your presentation is oral or a poster : Poster
Title of your presentation : Deep VLT spectroscopy of Ly-alpha envelopes around z=4.5 RQQs

Ly-alpha emitting envelopes around radio-quiet quasars are
less well known than those around radio-loud ones. We have
undertaken a survey of z=4.5 radio-quiet quasars having
various intrinsic brightnesses with FORS2@VLT in
multi-object spectroscopic mode, in order to detect and
characterize such envelopes. Thanks to the PSF given by
stars observed simultaneously with the quasar, we are able
to separate the quasar spectrum from that of the envelope.
The few objects observed to date show a fainter, but more
extended Ly-alpha envelope than expected from current

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