Author Topic: lens effect?  (Read 2775 times)

snburk

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lens effect?
« on: September 06, 2009, 02:04:29 am »
Around the main galaxy there are four objects in an almost perfect square. Could these be mirror images through a gravitational lens or is it just a coincidental pattern?


http://cas.sdss.org/dr7/en/tools/quicklook/quickobj.asp?id=587741721747783778

AlexandredOr

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Re: lens effect?
« Reply #1 on: September 06, 2009, 11:35:00 am »
Hi and welcome to the Zoo !
On the 4 objects you are refeering to, I see a red one that must be a star. You should check the spectra of the 3 others points, probably galaxies, to have a hint of answer...
Let's some lurking expert tell us more  :)

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Zeus2007

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Re: lens effect?
« Reply #2 on: September 09, 2009, 02:21:14 am »
Hi and welcome to the Zoo !
On the 4 objects you are refeering to, I see a red one that must be a star. You should check the spectra of the 3 others points, probably galaxies, to have a hint of answer...
Let's some lurking expert tell us more  :)

Or it could be a group of pals telling stories by a fire, the red one is probably a fallen apple. ;D Oh welcome to the Club.
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Budgieye

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Re: lens effect?
« Reply #3 on: September 09, 2009, 07:18:49 am »
Dear snburk
They are the same colour and texture as the main galaxy, so are probably satellite galaxies.
So you are probably correct about it being a coincidence.
Keep looking though!  :)

Edd

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Re: lens effect?
« Reply #4 on: September 09, 2009, 12:33:01 pm »
Gravitational lensing doesn't change colours with perhaps a couple of minor exceptions - if one path goes through something else or if your viewing angle means you see a very different bit of the galaxy. I'm afraid these are too different in colour to be a lens in my opinion, plus it's a very wide separation for a lens.
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snburk

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Re: lens effect?
« Reply #5 on: September 10, 2009, 07:24:45 pm »
Thanks for your answers everyone  :)

Cumulus

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Re: lens effect?
« Reply #6 on: October 15, 2009, 04:46:15 pm »
Hello,  I classified it as gravitational lens, but I`m not sure. What do you think?

http://cas.sdss.org/dr7/en/tools/quicklook/quickobj.asp?id=588007005798203690
« Last Edit: October 15, 2009, 05:52:36 pm by Cumulus »
Sorry for my poor english



Wowi680

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Re: lens effect?
« Reply #7 on: October 15, 2009, 07:49:49 pm »
The spots look all very similar but they have no spectrum entry. Is there another way to find out if it is a lense effect?
 "Only two things are infinite, the Universe, and human stupidity, and I'm not so sure about the Universe"--Albert Einstein

Budgieye

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Re: lens effect?
« Reply #8 on: October 16, 2009, 05:30:29 am »
Hi Cumulus, welcome to the zoo.

Looks like satellite galaxies again.

There may be a line in it on the left, but it is not clear.
You could post it in Possible Strong Gravitational Lens Thread
http://www.galaxyzooforum.org/index.php?topic=6927.0



There is no easy way to decide if something is a lens with the information we have.
We look at shape, texture and colour.
A scientist will research it if it looks like it could be a lens system.

See Zooite Guide to Strong Gravitational Lenses
http://www.galaxyzooforum.org/index.php?topic=275811
for some examples


Wadjet

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Re: lens effect?
« Reply #9 on: September 13, 2012, 08:27:48 am »
Rather than start a new thread for the same question, I'm another newbie wondering how to identify lensing. What do you think of AGZ0004QUG:

The upper one looks like one to my untutored eye, but the lower one could well be my imagination. It does bother me that there's nothing evident in this field that seems like it might be causing lensing, though, since that would need to be about 2/3rds up the right side of the frame, right?
« Last Edit: September 13, 2012, 08:30:31 am by Wadjet »

AlexandredOr

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Re: lens effect?
« Reply #10 on: September 13, 2012, 10:36:57 am »
Rather than start a new thread for the same question, I'm another newbie wondering how to identify lensing. What do you think of AGZ0004QUG:

The upper one looks like one to my untutored eye, but the lower one could well be my imagination. It does bother me that there's nothing evident in this field that seems like it might be causing lensing, though, since that would need to be about 2/3rds up the right side of the frame, right?

Hi, would say no. Lensing gives arks, and we generally see "circular" deformations around a virtual center.. It's not the case here.. BTW I may mistake  ::) Someone else ?
(I hope I'm clear enough...)

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