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easy(?) cosmology question: what to integrate to get R(t) by Phillip Helbig (undress to reply)[_2_]
When discussing Friedmann models, the usual approach is to start with the Friedmann equation then express dr/dt as a function of R, Omega, lambda, and so on,...
January 20th 20 12:05 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
0 240
Luminosity Evolution in Supernova Cosmology by Richard D. Saam
Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for Luminosity Evolution in Supernova Cosmology https://arxiv.org/abs/1912.04903 The authors...
January 20th 20 12:04 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
1 120
On "Nonstationarity of AGN variability" -- selection effect by Eric Flesch
A new paper accepted by ApJL, arXiv:2001.04471 "Nonstationarity of AGN variability: The only way to go is down!" by Caplar et al, concludes that visible quasar...
January 17th 20 04:26 AM
by Eric Flesch Go to last post
0 141
fourth "live post" from the Texas Symposium on Relativistic Astrophysics by Phillip Helbig (undress to reply)[_2_]
The concluding talk on open problems in cosmology was given by Joe Silk. I'll mention below a few things I found particularly interesting. Although the...
December 29th 19 08:57 PM
by Phillip Helbig (undress to reply)[_2_] Go to last post
2 359
third "livepost" from the Texas Symposium on Relativistic Astrophysics by Phillip Helbig (undress to reply)[_2_]
There has been much discussion, including some here in this newgroup, regarding the "tension" between various measurements of the Hubble constant. In general,...
December 20th 19 07:46 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
0 213
second "livepost" from the Texas Symposium on Relativistic Astrophysics by Phillip Helbig (undress to reply)[_2_]
At most of the last few conferences I've been to, including this one,=20 there has been a talk pointing out that primordial black holes could make=20 up most...
December 18th 19 10:54 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
0 217
"live post" from the Texas Symposium on Relativistic Astrophysics by Phillip Helbig (undress to reply)[_2_]
A few weeks ago, fellow moderator Jonathan suggested that I "live-post" from a conference, so I'll do so this week. He was actually thinking about another...
December 17th 19 06:47 AM
by Phillip Helbig (undress to reply)[_2_] Go to last post
0 219
Is the Universe Younger than We Thought? by Nicolaas Vroom
Accordingly to this article: https://medium.com/the-cosmic-companion/is-the-universe-younger-than-we-thought-e8a649a32ec8 "Is the Universe Younger than We...
(Multi-page thread 1 2)
November 14th 19 09:41 PM
by Richard D. Saam Go to last post
16 1,516
Felix Schmeidler, 1985 by [email protected]
Hello! The German astronomer Felix Schmeidler published two works in 1985. "Messung der Lichtablenkung während der Sonnenfinsternis am 15. Februar...
November 14th 19 09:40 PM
by [email protected] Go to last post
0 276
electronic-only publication at Astronomy and Astrophysics by Phillip Helbig (undress to reply)[_2_]
For a while back in the 1990s, A&A published some things (such as appendices to papers) ONLY electronically. However, ftp://cdsarc.u-strasbg.fr doesn't seem...
August 23rd 19 05:43 PM
by Phillip Helbig (undress to reply)[_2_] Go to last post
2 518
Resolving Mars methane isotopes, as bio probe? by stargene
The subject of Martian methane blowouts keeps arising. Assuming that they will be confirmed, is there any way yet on-site or in-orbit, to then measure the...
July 2nd 19 05:22 AM
by stargene Go to last post
0 662
Milliquas v6.3 released, now has double-lobed galaxies by Eric Flesch
The Million Quasars (Milliquas) catalogue v6.3 is released with data from publications to 15-June-2019, with the count of type-I quasars & AGN up to 623,004. ...
June 16th 19 03:19 PM
by Eric Flesch Go to last post
0 388
Can someone confirm that I have found some typos in some 1960s Soviet astronomy papers? by Phillip Helbig (undress to reply)[_2_]
Consider the following papers: DZ65: http://adsabs.harvard.edu/abs/1965SvA.....8..854D @ARTICLE { VDashevskiiYZeldovich65a , AUTHOR ...
May 30th 19 03:20 PM
by Phillip Helbig (undress to reply)[_2_] Go to last post
0 381
Reionization by Steve Willner
Not long ago, we had some discussion here of reionization. I've just seen a terrific colloquium by Steve Finkelstein on the subject. It's available...
May 11th 19 07:15 PM
by Steve Willner Go to last post
0 363
Revise age of the universe? by root[_2_]
Can the recent findings of the Space Telescope Institute be used to revise the age of the universe. What would the estimate of 13.7E9 years become if the...
May 10th 19 11:37 PM
by Phillip Helbig (undress to reply)[_2_] Go to last post
8 396
EHT Picture of the black hole in M87 by Tom Roberts
The picture from the Event Horizon Telescope: https://apod.nasa.gov/apod/ap190411.html Why is the center black? Does the accretion disk just happen to be in...
April 27th 19 08:55 AM
by Hannu Poropudas[_2_] Go to last post
6 380
supermassive black holes at z 7 by jacobnavia
A team of astronomers have conducted a search for distant super massive black holes and they have found 83 of them....
March 28th 19 10:56 PM
by Steve Willner Go to last post
1 392
Modelling surface temperatures on Mars by Ryan Pavlick
I am trying to model surface temperatures on Mars. Coming up with insolation received at the various latitudes was fairly simple, the equations are found at...
February 21st 19 07:50 PM
by pyotr filipivich Go to last post
1 2,150
Cosmological Problems by Richard D. Saam
There have been recent cosmological experimental disclosures represented in part by the following: The 7Be(n,p)7Li reaction and the Cosmological Lithium...
(Multi-page thread 1 2)
February 11th 19 08:11 PM
by Edward Prochak Go to last post
14 1,509
What does it mean in astrophysics for X-rays to be reflected? by Thomas Womack
Various articles about black holes talk about X-rays emitted near the event horizon 'reflecting off the accretion disc'. What kind of material is it that can...
February 5th 19 04:50 PM
by Steve Willner Go to last post
3 1,271
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