Author Topic: Blue elliptical?  (Read 157286 times)

meeneque

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Re: Blue elliptical?
« Reply #30 on: July 31, 2007, 08:55:24 pm »

serpens

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Re: Blue elliptical?
« Reply #31 on: July 31, 2007, 10:48:11 pm »

spaz

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serpens

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Re: Blue elliptical?
« Reply #33 on: July 31, 2007, 11:03:08 pm »

spaz

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Re: Blue elliptical?
« Reply #34 on: July 31, 2007, 11:10:15 pm »
Cool.  The z=.296 is it high enough to be considered a quazar?

serpens

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Re: Blue elliptical?
« Reply #35 on: July 31, 2007, 11:11:48 pm »
Cool.  The z=.296 is it high enough to be considered a quazar?
As far as I know - it is. A regular galaxy at such redshift would rather appear red. Redshifr of 0.296 is relatively high, though quasars often have redshifts over 1.

serpens

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Re: Blue elliptical?
« Reply #36 on: August 02, 2007, 05:59:08 pm »
Take a look at this one.
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587741816245518397

Is this a blue elliptical galaxy, or a barely defined spiral?

Invader_Xan

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Re: Blue elliptical?
« Reply #37 on: August 02, 2007, 08:57:17 pm »
Looks a little disk-like, doesn't it...?

Hrundi

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Re: Blue elliptical?
« Reply #38 on: August 02, 2007, 09:16:14 pm »
Ellipticals aren't blue due to the nature of what they are. Most/all of these should be faint irregulars/spirals.

NeilGibson

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Re: Blue elliptical?
« Reply #39 on: August 02, 2007, 09:32:54 pm »
587739153356226863
has a red shift of only 0.016
I guess you couldn't rule it our from being a disc

Hrundi

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Re: Blue elliptical?
« Reply #40 on: August 02, 2007, 09:35:18 pm »
It's most likely an irregular galaxy.

gumbosea

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Re: Blue elliptical?
« Reply #41 on: August 03, 2007, 01:49:19 pm »
I saw this galaxy last week; here are my notes for it (see attached jpeg also)

SDSS J114425.53+113343.6
GALAXY    ra=176.10638577, dec=11.56213532,   ObjId = 588017565485957294
Also denoted as CGCG 068-051, with z = 0.020569 +/- 0.000100

A blue elliptical with a yellow core? This struck me as quite unusual.

Perhaps I've seen many of these, but from farther away. Maybe the low
red-shift is what makes it seem so strange to me (core appears more yellow than orange).
Perhaps the low eccentricity is what makes it interesting (very circular).
Something about this one still really grabs my attention, but I just don't know why.

Blue ellipticals(?) very similar to 1st object, just a little farther away.
587730818439381149, z = 0.033
587739608092049521, z = 0.043

Blue ellipticals(?) with more eccentricity?
587739131880603834, z = 0.027
587725503410078000, z = 0.076
« Last Edit: September 16, 2007, 04:49:32 pm by gumbosea »

Hrundi

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Re: Blue elliptical?
« Reply #42 on: August 03, 2007, 01:52:50 pm »
It's a spiral

Bjarne_Birkbak

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tkmog

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Re: Blue elliptical?
« Reply #44 on: August 03, 2007, 03:56:43 pm »
To Serpens,

The clumpyness suggests spiral to me. See if the moderators agree with me.