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Old June 28th 17, 05:34 AM posted to sci.astro.research
jacobnavia
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Posts: 105
Default A new impossible galaxy

Le 23/06/2017 =C3=A0 05:06, wlandsman a =C3=A9crit :
The published paper
(https://arxiv.org/ftp/arxiv/papers/1706/1706.07030.pdf ) gives an
observed spectroscopic age of the galaxy of log[Age(yrs)] = 8.97
(+0.26,-0.25) or between 500 million and 1.7 billion years. This
is comfortably within its cosmological age at a redshift of z=2.15
of 3 billion years


How can a galaxy 3 times the mass of the milky way (10Gy old at least)
appear in just 2.5 billion years?


Since is 3 times more massive it will attract other galaxies 3 times as
much. If in its environment there are many smaller galaxies, it could
become the big ellipticals that we see today.

But this object is at least as old as our own galaxy since has 3 times
its mass, and a perfect spinning disk structure.

How come that this galaxy has exhausted its gas in just 3Gy?

In the other impossible galaxy that I habe brought to your attention
here, ALMA observations were immediately interpreted as star formation,
meaning that the galaxy was a normal galaxy making stars and not an old one.

The quasar explanation was discarded immediately, that would require
too much time to fit a young universe.

The center of the radiation in ALMA wavelengths was 10 000 light years
away from the center of the visible galaxy. That would fit an
extinguished quasar hypothesis, since that would be the place where the
quasar beam hit the surrounding material and heated it, stopping star
formation by quasar quenching.

But no, we are seeing a normal galaxy making stars obscured by dust. The
dust has a big hole just in synch with our line of sight since we do not
see dust in the visible, Hubble observations. No explanation is
adsvanced for the distance between the visible core and the center of
the ALMA infrared radiation. We suppose another nucleous obscured by
convenient dust.

And now you say that a fast spinning disk of stars, a galaxy 3 times as
massive as our own, can appear suddenly like that?

3 Gy is not a long time in galactic scales. That galaxy makes just 24
turns in that time since our own is making 4 turns/Gy, and that one is
spinning twice as fast.

In my opinion we are seeing what we see: an old galaxy, at least 10Gy
old that has exhausted its gas and could be the precursor of the giant
ellipticals we see today. So, the universe must be at least 23 Gy old.

Note that I use the red shift as a distance measurement even if I do not
think the universe had a bang 13.7 Gy ago. Why is the red shift there?

I do not know.