Redshifts and important early events

[Math Is Hard]

Hi,

I am researching several historic eras of the early universe and part of what I need to find is at what redshifts these events occurred. I have z = 1100 for the recombination era and z = 15-20 for the reinonization era. I haven't been able to turn up this info the "Dark Ages" yet. Any help is appreciated. And I'd be grateful if someone could point me to a good site (beginner level) on how these redshift numbers are calculated. Thank you.

[Ambitwistor]

Originally posted by Math Is Hard I have z = 1100 for the recombination era and z = 15-20 for the reinonization era.

Yes ... see, for instance:

http://arXiv.org/abs/astro-ph/0302207
http://arXiv.org/abs/astro-ph/0302209
http://arXiv.org/abs/astro-ph/0310723


I haven't been able to turn up this info the "Dark Ages" yet.

We're not sure:

http://www.gsfc.nasa.gov/scienceques2003/20031031.htm
http://arXiv.org/abs/astro-ph/0307396

[Math Is Hard]

Thanks, Ambitwistor. I don't know what I'd do without you! I appreciate your help now as well as in previous posts.