Lyman- α Galaxies at High Redshift. James E. Rhoads (Space Telescope Science Institute) with Sangeeta Malhotra, Steve Dawson, Arjun Dey, Buell Jannuzi, Emily Landes, Hy Spinrad, Dan Stern, JunXian Wang, and Chun Xu. Lyman α as a Signpost of Primordial Galaxies.
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James E. Rhoads
(Space Telescope Science Institute)
Steve Dawson, Arjun Dey, Buell Jannuzi, Emily Landes, Hy Spinrad, Dan Stern, JunXian Wang, and Chun Xu
We are looking for the first galaxies to form from primordial gas. Such objects should have…
Red lines mark our survey filter wavelengths.
Line searches are highly efficient in far red!
z=4.5: Rhoads et al 2000, Malhotra & Rhoads 2002, Dawson et al 2004 in prep;
z=5.7: Rhoads & Malhotra 2001, Rhoads et al 2003, Wang et al 2004 in prep.
z=6.5: Rhoads et al 2004
These are young star forming galaxies:
All data from NOAO 4m telescopes; NB918 stack is 24 hours’ integration.
(Rhoads et al. 2004; Gemini spectrum reduced by Chun Xu.)
Lyman α photons
Lyman α photons
(Miralda-Escude 1998; Miralda-Escude & Rees 1998;
Haiman & Spaans 1999; Loeb & Rybicki 1999)
(Rhoads & Malhotra 2001; ApJ Lett 563, L5; Hu et al 2002; Rhoads et al 2003; Rhoads et al 2004)
Figure: z=5.7 Ly-α sources from Rhoads et al 2003
Current evidence: Combine the Lyman α and Gunn-Peterson tests so far to study the evolution of the mass avgeraged neutral fraction, x:
There is no contradiction between the GP effect at z=6.2 and the Ly α at z=6.56.
(Figure from Rhoads et al 2003)