U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Science and Technology > Space
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
Old 09-05-2012, 09:35 AM
Location: Texas
5,070 posts, read 9,076,032 times
Reputation: 1632


New data from the South Pole Telescope indicates that the birth of the first massive galaxies that lit up the early universe was an explosive event, happening faster and ending sooner than suspected.
Extremely bright, active galaxies formed and fully illuminated the universe by the time it was 750 million years old, or about 13 billion years ago, according to Oliver Zahn, a postdoctoral fellow at the Berkeley Center for Cosmological Physics (BCCP) at the University of California, Berkeley, who led the data analysis.
Reply With Quote Quick reply to this message

Old 09-10-2012, 06:51 AM
Location: Wasilla, Alaska
17,825 posts, read 20,496,555 times
Reputation: 6500
I can certainly understand how ULIRGs (Ultra-Luminous Infra-Red Galaxies) can speed up the Reionization process. It also makes sense that ULIRGs would be far more numerous in the early age of the universe. This would also be the time that massive black holes are "bulking up" on the surrounding material and other black holes.

However, I do have a problem where the article says the Epoch of Reionization began 250 million after the Big Bang. The WMAP image of the Cosmic Background Radiation has a redshift of 1089, which puts it 379,000 years after the Big Bang and it is evident that the image is not completely opaque. Based upon the information I have found, the Epoch of Reionization began around 340,000 years after the Big Bang and lasted around 750 million years to reach its current level of ~10% opacity. Also, the first Population III stars are suppose to have formed between 100 and 200 million years after the Big Bang, which would have also contributed to Reionization.

I have no problem, however, with the article concerning the duration of the Epoch of Reionization. ULIRGs are tremendously energetic and I can see how they could speed up the Reionization process.
Reply With Quote Quick reply to this message
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply

Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Science and Technology > Space
Follow City-Data.com founder on our Forum or

All times are GMT -6. The time now is 11:43 AM.

© 2005-2019, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 - Top