Métaux: rejetés ou éjectés
ØLegrand et al. (2002)
Calcul l’énergie
qu’il faut pour rejeter
le gaz chaud enrichi
hors de la galaxie
H α
SFR Etdu
t~40 Myrs
CSFR
14 Myrs
Les  halos sont larges et de faible densité
These objects hold the key to the Origins theme, but they cannot be observed in the optical band
Many o the NGST’s top candidates are rare, and they may not be found without a deep IR survey. For example, NGST will be able to find many z=3-5 galaxies in its own deep fields, but probably not for z> 10
Objects.