Spectral Signatures of Early Galaxy Formation

Peng Oh (UCSB) - 10 Oct at 12:00 noon

I discuss two observational probes of early galaxy formation and reionization. The primary spectral line signature of ionizing sources is Ly-alpha emission. I discuss a new algorithm for computing radiative transfer through a multi-phase dusty interstellar medium, and several applications. In particular, I show that preferential transmission of resonance line photons is possible, which may explain the puzzlingly high equivalent widths seen in many high-redshift galaxies. As for the intergalactic medium, our primary observational constraints come from quasar absorption line spectra, and (in the years to come) 21cm observations. I discuss interpretation of existing quasar spectra, and discuss prospects for analyzing the rich 21cm data sets which should be coming our way in the next few years.

The seminar will be held in 544 Campbell Hall.

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