Dark Ages of Astronomy (Dark to Light). Dark Ages. z =0. z =5.8. z =1000. SDSS Reionization Studies. SDSS telescope at Apache Point. End of Reionization - SDSS Quasars - Fan et al. 2006. Possible Causes of Reionization. Dark Matter-Driven Gravitational Collapse Hydrodynamic Interactions
SDSS telescope at Apache Point
End of Reionization - SDSS Quasars - Fan et al. 2006
Dark Matter-Driven Gravitational Collapse
Atomic and Molecular Cooling
Synthesis and Dispersal of Metallic Elements
Birth & Feeding of the 1st Supermassive BHs
Razoumov et al. 2002
Overdense to Underdense: yellow, green, light blue, dark blue
Black regions are neutral.
Time in movie is linear in physical time.
Totani et al. 2006
Lyα Cross Section:
(1) Measure SFR 5<z<12 by discovering high-z GRBs & afterglows;
(2) Enumerate brightest quasars over 6<z<10 & measure reionization contribution;
(3) Enable detailed studies of the reionization history & metal enrichment in the early Universe;
(4) Provide 3D positions of high-z star-forming galaxies & SMBHs to next-generation observatories
X-Ray Flash Monitor (XRFM): Coded Mask, 1-20 keV, 4 sr FoV
Near-IR Telescope (NIRT): 50 cm, 0.7-1.7 μm, J = 19.6, 1296 arcmin2 FoV
Detects & localizes
Low-resolution spectroscopy of high-z GRBs & quasars
HE Monitoring Instrument (HEMI): non-imaging , 0.02-1.5 MeV, 6 sr FoV
Bromm & Loeb (2006)
Janus was the god of gates, doors, doorways, beginnings, and endings.
Janus was frequently used to symbolize change and transitions such as the progression of future to past, of one condition to another, of one vision to another, and of one universe to another. He was also known as the figure representing time because he could see into the past with one face and into the future with the other.
Janus is also know as “custodian of the universe” and was a deity of beginnings.