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Fri Aug 17, 2018, 03:34 AM

Earliest galaxies found 'on our cosmic doorstep'

Some of the earliest galaxies to form in the Universe are sitting on our cosmic doorstep, according to a study.
...
When the researchers plotted the galaxies according to their luminosity function, they separated into two distinct populations.
...
The first population of galaxies appears to have been formed during the "cosmic dark ages", a period of cooling which began some 380,000 years after the Big Bang and lasted for 100 million years.

The second population, consisting of slightly brighter galaxies, seems to have formed hundreds of millions of years after the first.

https://www.bbc.co.uk/news/science-environment-45198764

(not easy to explain in 4 of the short paragraphs that the BBC uses - see the whole article. Or the paper:

The (re)ionization of hydrogen in the early universe has a profound effect on the formation of the first galaxies: by raising the gas temperature and pressure, it prevents gas from cooling into small halos, thus affecting the abundance of present-day small galaxies. Using the Galform semi-analytic model of galaxy formation, we show that two key aspects of the reionization process—when reionization takes place and the characteristic scale below which it suppresses galaxy formation—are imprinted in the luminosity function of dwarf galaxies. We focus on the luminosity function of satellites of galaxies like the Milky Way and the LMC, which is easier to measure than the luminosity function of the dwarf population as a whole. Our results show that the details of these two characteristic properties of reionization determine the shape of the luminosity distribution of satellites in a unique way, and are largely independent of the other details of the galaxy formation model. Our models generically predict a bimodality in the distribution of satellites as a function of luminosity: a population of faint satellites and population of bright satellites separated by a "valley" forged by reionization. We show that this bimodal distribution is present at high statistical significance in the combined satellite luminosity function of the Milky Way and M31. We make predictions for the expected number of satellites around LMC-mass dwarfs where the bimodality may also be measurable in future observational programs. Our preferred model predicts a total of 26 ± 10 (68% confidence) satellites brighter than M V = 0 in LMC-mass systems.

http://iopscience.iop.org/article/10.3847/1538-4357/aacbc4/meta

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Reply Earliest galaxies found 'on our cosmic doorstep' (Original post)
muriel_volestrangler Aug 2018 OP
orangecrush Aug 2018 #1
SWBTATTReg Aug 2018 #2

Response to muriel_volestrangler (Original post)

Fri Aug 17, 2018, 05:41 AM

1. Thanks


Interesting read!




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Response to muriel_volestrangler (Original post)

Fri Aug 17, 2018, 09:45 AM

2. Indeed, interesting article...thanks for posting! nt

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