[AZ-Observing] Re: [sac-forum] FW: [ASKC] Article about Einstein Rings
- From: "AJ Crayon" <acrayon@xxxxxxx>
- To: <sac-forum@xxxxxxxxxxxxx>, <az-observing@xxxxxxxxxxxxx>
- Date: Sat, 12 Jan 2008 12:41:42 -0700
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Dick, some time back Dr. Burstine, from ASU, indicated something like =
this was unique. Naturally becasue it is the only know example of it =
kind. Guess we will have to wait and see if it becomes an everday =
happening. Still a very interesting discovery.
Thanks,
aj
----- Original Message -----=20
From: Richard Harshaw=20
To: sac-forum@xxxxxxxxxxxxx ; az-observing@xxxxxxxxxxxxx=20
Sent: Saturday, January 12, 2008 6:46 AM
Subject: [sac-forum] FW: [ASKC] Article about Einstein Rings
Got this note and link from a colleague in Kansas City. Interesting!
=20
Dick Harshaw
=20
=20
From: ASKC@xxxxxxxxxxxxxxx [mailto:ASKC@xxxxxxxxxxxxxxx] On Behalf Of =
jim s
Sent: Saturday, January 12, 2008 1:04 AM
To: ASKC@xxxxxxxxxxxxxxx
Subject: [ASKC] Article about Einstein Rings
=20
this article details a phenomenon which is as significant as pulsars =
if=20
it can be exploited. This chance occurance allows the possiblity of an =
accurate mass measurement of a very distant galactic object. This is=20
significant, because the measurement of luminosity and mass correlated =
to that allows an measurement of distance from other than estimations=20
that have been used before.
Pulsars were important because they allowed stars to be measured for=20
distance. By spotting pulsar type objects in nearby galazies the=20
distances to those objects could be measured. At some distance the use =
of red shift to distance was used, but of course is and was imprecise.
This may allow an object with a very large red shift to be massed, and =
the proper luminosity measured, pushing that measure out much deeper=20
than before.
Just as a measure of how things have changed, I took an astrophysics=20
class in 1974, and it was assumed that the redshift would not be =
nailed=20
down due to a lack of such a discovery as this. It is amazing to see=20
things that were thought to have been "impossible" actually fall into=20
place, and advance things in this way.
Jim
=
http://science.slashdot.org/article.pl?sid=3D08/01/11/0039212&from=3Drss
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