Author Topic: Blue elliptical?  (Read 155599 times)

suprtrkr

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Re: Blue elliptical?
« Reply #15 on: July 31, 2007, 01:46:57 am »

Chipper Q

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Re: Blue elliptical?
« Reply #16 on: July 31, 2007, 06:41:11 am »

Invader_Xan

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Re: Blue elliptical?
« Reply #17 on: July 31, 2007, 09:03:59 am »
Redshift's only 0.015... Is that in our galaxy? ??? If not, it's quite close... What is that?
The spectrum shows oxygen and hydrogen.
« Last Edit: July 31, 2007, 09:20:43 am by Invader_Xan »

suprtrkr

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Re: Blue elliptical?
« Reply #18 on: July 31, 2007, 12:52:13 pm »
Think I might have found one over here.

« Last Edit: July 31, 2007, 12:56:54 pm by suprtrkr »

Barred

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Re: Blue elliptical?
« Reply #19 on: July 31, 2007, 01:26:33 pm »
I think I have found one too.



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gtomescu

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Re: Blue elliptical?
« Reply #20 on: July 31, 2007, 02:37:29 pm »
I'm not so optimistic about blue elipticals. Not that they don't exist. After all, eliptical galaxies were once young and maybe collisions fuelled star formation (but I won't necessary bet on this).

My reasoning is this: We see in SDSS lots of neat spirals and elips - close galaxies, for which the resolution is great and we can discern the details. Well, I didn't saw yet a single blue elips with good details.
Keep in mind that for SDSS, 'far' means a different thing than for Hubble. SDSS doesn't go a lot back in time, because the telescope mirror is small. So the farthest galaxies we can see here may not be that much different that the close ones. We only see them blurry but they are only a bit older (couple of billion years) than the close ones. So I don't think the blurry blue things are elips seen at their beginning.

The bluish things without arms that seem to be elips are all far and I have a feeling a better resolution will show a different picture. They seem to be irregulars but I don't know if we can say that an irregular is an elips (or turn into one) just because we can't see the arms.
On the other hand, it's possible that an irregular will turn into an elips since the mergers tend to shape galaxies this way. So maybe, the closest to blue an elips galaxy can be is after a merger, while it's still irregular. But my feeling is that, once the things settle into an elips, it will lose its blue and become red quite fast as the blue stars die quickly.

I do hope that someone will come with a true spectacular picture of a blue eliptical, but I'm really cautious on this for the moment.

suprtrkr

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Re: Blue elliptical?
« Reply #21 on: July 31, 2007, 03:43:14 pm »
I do hope that someone will come with a true spectacular picture of a blue eliptical, but I'm really cautious on this for the moment.
Me, too. But I'm fairly sure they exist. This object, posted above, drew a comment from Zookeeper Kevin to the effect that it was. And you're right: I'd really like to see a Hubble pic of it...

Bjarne_Birkbak

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Re: Blue elliptical?
« Reply #22 on: July 31, 2007, 04:23:39 pm »

Bjarne_Birkbak

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Bjarne_Birkbak

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meeneque

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suprtrkr

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Re: Blue elliptical?
« Reply #26 on: July 31, 2007, 06:31:03 pm »
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588295841784725570


I think that one's a fair candidate for a quasar. z=.127's kinda close, and spec class is galaxy. OTOH, the spectrum spiky and spectral targeting is QSO. I'll give 'er a rousing Don't Know.

tkmog

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Re: Blue elliptical?
« Reply #27 on: July 31, 2007, 06:49:22 pm »
I would call it a blue elyptical - it look like multitudes stars in the outer area which you should not have if it were just a star.

Arconin

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Re: Blue elliptical?
« Reply #28 on: July 31, 2007, 08:46:55 pm »
Hi all,
ok, how about this one? 

http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587741602038874190

Could this be a blue elip or is it more likely an irregular?

 :)

serpens

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Re: Blue elliptical?
« Reply #29 on: July 31, 2007, 08:48:36 pm »
Hi all,
ok, how about this one? 

http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587741602038874190

Could this be a blue elip or is it more likely an irregular?

 :)

My bet is an irregular starting to spin. There is a slight spiral structure already.