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Bluetides simulation by Steve Willner
There was some earlier discussion of how early in the universe galaxies could form. I happened to run across a simulation that gives one...
January 26th 17 08:52 PM
by Steve Willner Go to last post
0 772
How to get scope time to obtain 7 spectra? by [email protected]
Is there any path anyone knows for me to get some scope time to take some spectra and determine what 7 targets around an interacting galaxy pair are? They are...
January 25th 17 07:51 PM
by Mike Dworetsky Go to last post
2 863
The dark ages by jacobnavia
After the big bang, the gas was too hot to form stars. A time must pass to cool the universe so that the star formation could begin. In that period of time...
(Multi-page thread 1 2)
January 25th 17 07:51 PM
by Gary Harnagel Go to last post
10 1,326
Quasar brightness lower bound, real or my error? by No Name
For this plot of quasar Mag vs z https://inspirehep.net/record/1208042/files/Mi_zdist1_dr10.png There is a lower bound for quasar Mag that looks...
January 23rd 17 11:45 PM
by [email protected] Go to last post
6 1,055
Plot of SN rate vs z? by No Name
I've found a bunch of SFR plots vs z, but haven't yet found an SN rate vs z plot. Does one exist? Ideally, SNII and SNIa plots separated since each produces...
January 18th 17 06:49 AM
by No Name Go to last post
0 777
What is this galaxy? by [email protected]
Anyone know what kind of galaxy this galaxy might be? http://skyserver.sdss.org/dr13/en/tools/chart/navi.aspx?ra=186.9189&dec=13.076 It has a ring around the...
January 18th 17 06:49 AM
by No Name Go to last post
7 1,300
Reflections on ULAS J1120+0641 and GN-z11 by No Name
] On Wednesday, December 28, 2016 at 5:14:16 PM UTC-5, jacobnavia wrote: Most of the original snipped ... I worked a few hours for this post, and I think...
January 12th 17 06:01 AM
by No Name Go to last post
3 796
What dictates galaxy and planetary system sizes? by Richard D. Saam
What are the functional relationships dictating galactic size (presently ~10^22 cm) and star planetary system size (presently ~10^15 cm) contained in a Hubble...
(Multi-page thread 1 2)
January 8th 17 05:13 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
15 1,451
Reflections on ULAS J1120+0641 and GN-z11 by Steve Willner
In article , jacobnavia writes: https://arxiv.org/pdf/1603.00461.pdf Published in ApJ...
January 7th 17 10:31 AM
by Steve Willner Go to last post
0 854
AGN Luminosity Function as f(z) by [email protected]
Hello, I've so far not found any values for numbers of active galaxies vs normal galaxies across time. What percentage of galaxies go through an active...
January 7th 17 10:31 AM
by Steve Willner Go to last post
3 934
How to use SIMBAD? or other sky viewer by No Name
I would like to do some viewing of the sky using an online viewer. I have tried simbad, though haven't figured it out very well. Is there a tutorial video...
December 30th 16 09:37 PM
by Eric Flesch Go to last post
1 1,136
How to View SDSS data base? by No Name
I am looking for tutorial or help to access SDSS data / images. I would like to select an (ra, dec) pair with say 1 arc minute view, then, list quasars within...
December 28th 16 10:24 AM
by [email protected] Go to last post
1 705
Angular separation vs separation distance with increasing z? by [email protected]
Suppose two objects are separated on the sky by 1 arc minute, and I can move them in or out in z as a test example.... Then, as I look out to higher z...
December 28th 16 04:45 AM
by No Name Go to last post
2 900
Galactic massive BH photon consumption vs Galactic center flux? by [email protected]
On Monday, December 12, 2016 at 1:03:35 PM UTC-8, Steve Willner wrote: In article , Steven Carlip ...
December 26th 16 11:26 AM
by [email protected] Go to last post
0 721
L_Universe due to SNII Neutrinos = 322 * L_Universe? by No Name
In SLAC lecture at https://www.youtube.com/watch?v=3DHiCRTUxgwPY Public Lecture | Supernovas: Gravity-powered Neutrino Bombs Alex Friedland comments that for...
December 24th 16 11:15 AM
by [email protected] Go to last post
2 757
Redshift when CBR energy density = energy density of all other radiation by [email protected]
I'm working to assemble a table / graph for the Luminosity of the universe as a function of age of the universe. I think these are the only sources of...
December 24th 16 11:14 AM
by [email protected] Go to last post
7 814
Reionization Energy or Universe Mass Budget by [email protected]
I haven't figured out how to calculate this value, should be simple so I'm just missing something I think. From Madau plots etc., I get star formation rates...
December 24th 16 11:14 AM
by [email protected] Go to last post
0 676
Fantastic News by Robert L. Oldershaw
Fantastic news! Discrete Scale Relativity predicted, before exoplanets were first discovered, that the mass function of the exoplanet masses would have its...
(Multi-page thread 1 2)
December 21st 16 01:34 PM
by Phillip Helbig Go to last post
13 1,346
Universe Luminosity Function and CBR energy density evolution? by No Name
Does anyone know of a good paper showing the luminosity of the universe as a function of age of the universe? ie, a plot showing total L per unit co moving...
December 20th 16 05:33 PM
by Steve Willner Go to last post
6 980
R(t) for Observable_Today, Universe for early universe ages by [email protected]
I want to determine the radius vs time for the universe (observable today) but using universe ages starting with age =3D 0.721 Gyr and moving forward in Gyr...
December 13th 16 10:10 PM
by Phillip Helbig (undress to reply)[_2_] Go to last post
2 801
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