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SUMMARY:Spectroscopic studies of star-forming galaxies in the Epoch of Rei
 onisation - Joris Witstok
DTSTART:20211027T121500Z
DTEND:20211027T124500Z
UID:TALK162727@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:In this talk\, I will firstly present a spectroscopic case stu
 dy of a 30× lensed galaxy at z=5. Detections of the C IV and [Ne III] lin
 es allow us to constrain the origin of the hard radiation field\, the ioni
 sation parameter\, and the metallicity\, while observed Mg II emission mig
 ht prove a key tracer of escaping ionising radiation for JWST. Before JWST
 \, however\, we can already spectroscopically probe galaxies in the Epoch 
 of Reionisation (EoR) with ALMA\, whose recent detections of the far-infra
 red [CII] 158 μm and [OIII] 88 μm emission lines have opened a new obser
 vational window for studying galaxies at the highest redshift. In this tal
 k\, I will furthermore present new [OIII] 88 μm observations of four gala
 xies at z=7 recently detected by ALMA in [CII]\, allowing a multi-waveleng
 th comparison combined with new deep HST images of the rest-frame UV. The 
 [OIII] emission\, corresponding to diffuse\, highly ionised gas\, and [CII
 ] emission\, tracing neutral gas and photon dissociation regions\, allow s
 ome of the first explorations of the interstellar medium in the EoR.
LOCATION:Hybrid Sackler (sign-up needed) + Zoom - Details will be sent by 
 email.
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