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Gravity lenses?

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#1 DeVikke

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Posted 23 October 2008 - 01:13 AM

Just out of curiosity and of course it really fascinates me...
Is it possible to see them with a 8" SCT? If yes, where should I take a look.

#2 Kaizu

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Posted 23 October 2008 - 10:59 AM

Maybe not with an 8" but the Q0957+561 has been seen with a 12" newt. I imaged it with 10" newt.
Check the 3rd last picture on the Quasars page.

Kaizu

#3 ahopp

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Posted 20 March 2013 - 08:41 AM

I too have an interest in these objects. I am going to work off of the CASTLES catalog:

http://www.cfa.harvard.edu/castles/

Tony

#4 Footbag

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Posted 20 March 2013 - 08:46 AM

A lot of cool targets. The Double Quasar will be the easiest. After that they get tough.

#5 ahopp

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Posted 20 March 2013 - 12:31 PM

I have 2845mm of FL, so, I am going to go for it. All I want is any image at all, does not have to look like the pictures. Just want confirmation that I captured some photons from these things.

For me it is all about the hunt...

Tony

#6 Footbag

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Posted 22 March 2013 - 12:39 PM

In this link there is some info on amateurs having luck with these targets. I hope to give it a try as well.

http://tech.groups.y...g/message/63222

#7 sgottlieb

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Posted 22 March 2013 - 01:41 PM

In Steinicke and Jakiel's book on Galaxies, the brightest lensed quasars are listed as

APM 08279+5255 (separation 0.4", z = 3.87)
Q 0957+561 ("Double Quasar", separation 6", z = 1.4)
HE 1104-1805 (separation 3", z = 2.3)
PG 1115+080 ("Triple Quasar", separation 2.1"/2.7, z = 1.7)
UM 425 (separation 6.5", z =1.5)
H 1413+117 ("Cloverleaf Quasar", separation 1.4", z = 2.5)
Q 2237+0305 ("Einstein's Cross", separation 1.8", z = 1.7)

#8 LivingNDixie

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Posted 22 March 2013 - 03:00 PM

Steve,
What is the title of the book you are referencing?

#9 Alvin Huey

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Posted 22 March 2013 - 06:12 PM

Preston,

The book is here.

You can also download my galaxy trio guide and scroll all the way to the back of it. Third link down.

I have the ones that are listed below by Steve.

APM 08279+5255 (separation 0.4", z = 3.87) - no
Q 0957+561 ("Double Quasar", separation 6", z = 1.4) - yes
HE 1104-1805 (separation 3", z = 2.3) - yes
PG 1115+080 ("Triple Quasar", separation 2.1"/2.7, z = 1.7) - yes
UM 425 (separation 6.5", z =1.5) - no
H 1413+117 ("Cloverleaf Quasar", separation 1.4", z = 2.5) - yes
Q 2237+0305 ("Einstein's Cross", separation 1.8", z = 1.7) - yes

#10 ahopp

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Posted 23 March 2013 - 10:44 AM

Got my scope in and first lit it, incredible optics, and mount is built like a tank...

Tony

#11 Akarsh Simha

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Posted 25 March 2013 - 10:25 PM

I've been wanting to see gravitational lenses. I'd never heard of the APM 08279+5255 thing.

The double quasar was unresolvable in my 18" from Texas Star Party 2012, but I could certainly see that it had an "extension" along one axis. Higher power did not help substantially.

Here's a report about "sensing the lensing" in the Einstein's Cross with a 14":
http://astronomy-mal...crossobsrpt.htm
And there's Barbara Wilson's report with a 20":
http://astronomy-mal...ace/crossch.htm

I'm still afraid of Einstein's Cross, having seen what the Double Quasar looks like!






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