Author Topic: Merger Checking Examples  (Read 38706 times)

waveney

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Re: Merger Checking Examples
« Reply #30 on: August 14, 2008, 06:14:11 pm »
Hmmmmmmmm. Ring? Elliptical merging with or overlapping with irregular? Lensing? Merging or not? I really haven't a clue with this one, and, astonishingly, it hasn't been posted yet!

Looking at the results, nobody has much of a clue on this, it's currently 5 votes for Merger, 5 not a merger and 7 Don't know.
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scaryitalian

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Re: Merger Checking Examples
« Reply #31 on: August 25, 2008, 05:04:08 pm »
Tired Merger Hunter thinking aloud.

Target Id 587742610266914895,  quite obviously an elliptical with a bluish star superimposed just SE of the core, so Not a Merger



until you zoom out and wonder what might really happen between the three ellipticals in this cluster - all the more so, since the target is the smallest, so possibly most likely to suffer from its companions' influences...



Still Not a Merger, because the background isn't dark enough (a star further East) for me to clearly see star trails or asymmetries in shape.

However, a repeat of an old lesson: ZOOM OUT first, just in case...   ;D

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to match the cool green rolling hills of Earth ...

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Alice

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Re: Merger Checking Examples
« Reply #32 on: August 25, 2008, 08:16:48 pm »
Am I still allowed to ask questions? ;D ;D ;D

I hope so. Is this a merger? More to the point, is it a ring, or half a ring, or is the blue bit wrapped round the yellow blob anything to do with the yellow blob? What does everyone think?


[urlhttp://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587731513681903760]587731513681903760[/url]

lehensuge

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Re: Merger Checking Examples
« Reply #33 on: August 25, 2008, 09:13:03 pm »
Bonsoir,
I am in trouble with
587742775640326318
I said " merger", but  :-\

Geoff

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Re: Merger Checking Examples
« Reply #34 on: August 25, 2008, 09:19:21 pm »
Am I still allowed to ask questions? ;D ;D ;D

I hope so. Is this a merger? More to the point, is it a ring, or half a ring, or is the blue bit wrapped round the yellow blob anything to do with the yellow blob? What does everyone think?

[image snipped]
[urlhttp://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587731513681903760]587731513681903760[/url]

Hi Alice, 

I'm not sure if this is a merger or not (not being very good at judging mergers), but it does look like a plastic duck which would look good in my bath  :)
  Sometimes I think we're alone. Sometimes I think we're not. In either case, the prospect is staggering!- Arthur C. Clarke

Geoff

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Re: Merger Checking Examples
« Reply #35 on: August 25, 2008, 09:22:41 pm »
Bonsoir,
I am in trouble with
587742775640326318
I said " merger", but  :-\

Hi lehensuge

Here is your picture:



It's difficult to judge if it's a merger or not - I will let one of the merger experts have a go.
  Sometimes I think we're alone. Sometimes I think we're not. In either case, the prospect is staggering!- Arthur C. Clarke

Alice

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Re: Merger Checking Examples
« Reply #36 on: August 25, 2008, 09:48:29 pm »
I would call lehensuge's picture a merger - that looks like a trail of stars behind a galaxy which was dragged forward to me.

I love the plastic duck idea, Geoff! :D :D :D I'd better move it to the animals thread once I've got a collection of opinions . . .

lehensuge

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Re: Merger Checking Examples
« Reply #37 on: August 27, 2008, 08:36:49 pm »
Bonsoir,
What do you think about this nice jellyfish ?
I decided merger . And you ?
587738572460523720



lehensuge

fluffyporcupine

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Re: Merger Checking Examples
« Reply #38 on: August 27, 2008, 08:50:06 pm »
Bonsoir,
What do you think about this nice jellyfish ?
I decided merger . And you ?
587738572460523720
lehensuge
looks more irregular than merger IMHO :)


waveney

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Re: Merger Checking Examples
« Reply #40 on: August 29, 2008, 07:02:24 am »
How would you know its not in the merger checking sets?  (It isn't as it happens)  The only people with the object lists are Chris, Dan and myself.

There looks like some merger activity, but it may not involve all three.
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StephenT

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Re: Merger Checking Examples
« Reply #41 on: August 29, 2008, 11:35:32 am »
Wrong wording.  It should have said "Not obtained from the merger set."

momotaro

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Re: Merger Checking Examples
« Reply #42 on: August 29, 2008, 05:57:56 pm »
The merger set contains also some very well known galaxy already in NGC and such, some of them have their own page on wikipedia like 587728676861051075 that is Arp 104, where Herschel in person posed his eyes back in 1790...
I was wondering the reason for this, I guess it is just to provide us with some truly beautiful sight after clicks over clicks on reddish wiggly blobs, innit  ;)

Btw as you see now I know how to look in NED, isn't that great

waveney

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Re: Merger Checking Examples
« Reply #43 on: August 29, 2008, 06:09:39 pm »
The merger set contains also some very well known galaxy already in NGC and such, some of them have their own page on wikipedia like 587728676861051075 that is Arp 104, where Herschel in person posed his eyes back in 1790...
I was wondering the reason for this, I guess it is just to provide us with some truly beautiful sight after clicks over clicks on reddish wiggly blobs, innit  ;)

There are several reasons:

The data set includes all images from GZ1 where 20% or more people clicked merger - irrespective of what we already know.

Having some known images (both known mergers and known not mergers) allows us to weight the checking by individual hunters.

And yes it does make the hunt that bit more interesting.

Most ARPs are mergers.
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lehensuge

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Re: Merger Checking Examples
« Reply #44 on: August 29, 2008, 09:33:31 pm »
Hi Waveney,

What do you yhink about this one :

587738574072971381



This seems to me to be a specular image, an elliptic playing with an irregular ?

Yes, I'm very interested with you answer.

Bonsoir