| 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 |
| Abstract |
|
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 predictions. |
