Author Topic: Hubble: Ring-like Hoops and Circular Clump clusters  (Read 41935 times)

PeterD

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #450 on: June 25, 2012, 11:11:34 am »


AHZ4000029; 90001599; z=0.42;

zutopian

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Neuromante

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #452 on: July 29, 2012, 11:06:44 pm »

zutopian

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #453 on: August 11, 2012, 04:28:45 pm »

http://www.galaxyzoo.org/examine/AHZ40002gb                           

zutopian

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #454 on: November 17, 2012, 02:56:10 pm »
Here is an SDSS image from the new GZ.:
UGC 12011 GPair


http://talk.galaxyzoo.org/objects/AGZ00063n9
http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237680503430119621

PS: I posted it also in "Hoag Type galaxies and Collisional rings".
« Last Edit: November 17, 2012, 03:32:13 pm by zutopian »

Thomas J

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #455 on: November 17, 2012, 06:47:20 pm »
Looks good here, too.
I am very interested in the Universe- I am specialising in the Universe and all that surrounds it.....            Peter Cook.


zutopian

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #456 on: November 18, 2012, 04:08:47 am »
Peter D, who studies the Blue Caterpillars (clumpy chain galaxies), mentioned below paper in the BC topic. I replied, that the presented images of the rings remind me of this topic.

"Rings and Bent Chain Galaxies in the GEMS and GOOD Fields"
Quote
Twenty-four galaxies with rings or partial rings were studied in the GEMS and GOODS fields out to z~1.4. Most resemble local collisional ring galaxies in morphology, size, and clumpy star formation. Clump ages range from 10^8 to 10^9 yr and clump masses go up to several x10^8 Msun, based on color evolution models. The clump ages are consistent with the expected lifetimes of ring structures if they are formed by collisions. Fifteen other galaxies that resemble the arcs in partial ring galaxies but have no evident disk emission were also studied. Their clumps have bluer colors at all redshifts compared to the clumps in the ring and partial ring sample, and their clump ages are younger than in rings and partial rings by a factor of ~10. In most respects, they resemble chain galaxies except for their curvature; we refer to them as ``bent chains.'' Several rings are symmetric with centered nuclei and no obvious companions. They could be outer Lindblad resonance rings, although some have no obvious bars or spirals to drive them. If these symmetric cases are resonance rings, then they could be the precursors of modern resonance rings, which are only ~30% larger on average. This similarity in radius suggests that the driving pattern speed has not slowed by more by ~30% during the last ~7 Gy. Those without bars could be examples of dissolved bars.
Authors:Debra Meloy Elmegreen (1), Bruce G. Elmegreen (2) ((1) Vassar College, (2) IBM T.J. Watson Research Center)
(Submitted on 26 Jul 2006)
http://arxiv.org/abs/astro-ph/0607579
« Last Edit: November 18, 2012, 07:30:34 am by zutopian »

zutopian

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #457 on: November 18, 2012, 07:28:28 am »
Here is one of the images, which I recognized from that paper, about which I informed in my previous post.
It was posted on the forum before, e.g. in "Hubble Ring Galaxies". Besides it was presented in an OOTD, but actually just for fun.


http://zoo3.galaxyzoo.org/examine/AHZ40005e6
http://www.ugastro.berkeley.edu/~rgriffit/ACS-GC_jpeg_atlas/90036610_info_bw.jpg

PS: I would like to see the coloured versions of all images from the paper. The ones in the paper are just b/w.
« Last Edit: November 18, 2012, 12:18:24 pm by zutopian »

zutopian

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Re: Hubble: Rings, Hoops and Circular Clumps
« Reply #458 on: November 18, 2012, 07:52:17 am »
90028174

I recognized that image!
It is presented in the paper "Rings and Bent Chain Galaxies in the GEMS and GOOD Fields".
Besides it is presented in another paper as a lens candidate.:
"Gravitational lens candidates in the E-CDFS" (I informed about the paper in the lens topic. The image was posted there before.)
So Zooities agree with both options, because they posted it in both topics! ;D
« Last Edit: November 23, 2012, 07:52:59 pm by zutopian »

zutopian

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zutopian

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Re: Hubble: Ring-like Hoops and Circular Clumps
« Reply #460 on: November 18, 2012, 10:02:05 pm »
90024532

These rings are amazing. I wonder if these aren't every early stages of small galaxy development, before merging with other nearby galaxies.

AHZ40003xv
Survey: GEMS and GOODS-S
Survey reference: 90024532
Redshift: 0.986867
in NED Description: QSO1;QSO2      HII 

Hi grrower,
I've to classify this object, and i found in Ned descrition of QSO so I posted in thread "Hubble: QSO's".

Your question has been in discussion on a study by a team of astronomers in paper
Quote from: T. Böker, J. Falcón-Barroso
arXiv:0710.4036  A SINFONI view of Galaxy Centers: Morphology and Kinematics of five Nuclear Star Formation Rings
and also in
Star-Forming Nuclear Rings in Spiral Galaxies
They discussed about two scenarii
Quote
“Popcorn” or “Pearls on a String”?
In the first scenario, the gas accumulates along the ring, until a critical density is
reached. Presumably driven by turbulence (Elmegreen 1994), the ring then becomes unstable
to gravitational collapse, and star formation is induced. In this model, either the entire ring
structure begins to form stars at the same time, or individual hot spots collapse at random
times and locations within the ring. Either way, there should be no systematic age sequence
of hot spots along the ring. Because of its stochastic nature, we call this the “popcorn
model” of star formation.
In the second scenario, a short-lived, quasi-instantaneous “delta burst” of star formation
is induced in (and only in) a well-defined region along the ring where the gas density
becomes sufficiently high to ignite star formation. The precise location of this “overdensity
region” (ODR) depends on the details of the potential, but it is often found close to, and
somewhat downstream from where the gas enters the ring.

I don't know which is the preferred scenario for the object posted but not yours ???

This redshift ~1 #90024532 reminds me a LINER nucleus and a starburst in our "local sky" : NGC4102 very close at z=0.003 but the same thumbnail appearance in
http://www.galaxyzooforum.org/index.php?topic=99.msg358903#msg358903  detailed by Hubble
and discussed in yesterday paper
Quote from: Sara C. Beck
arXiv:1008.1800 NGC 4102: HIGH RESOLUTION INFRARED OBSERVATIONS OF A NUCLEAR STARBURST RING

c_cld

It is also one of the galaxies, which are presented in the paper "Rings and Bent Chain Galaxies in the GEMS and GOOD Fields".

zutopian

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Re: Hubble: Ring-like Hoops and Circular Clump clusters
« Reply #461 on: November 19, 2012, 01:35:51 pm »
Looks good here, too.

Well, I posted an SDSS image, but this topic is in the Hubble board.

PeterD

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Re: Hubble: Ring-like Hoops and Circular Clumps
« Reply #462 on: November 20, 2012, 03:13:56 pm »
90024532

These rings are amazing. I wonder if these aren't every early stages of small galaxy development, before merging with other nearby galaxies.

AHZ40003xv
Survey: GEMS and GOODS-S
Survey reference: 90024532
Redshift: 0.986867
in NED Description: QSO1;QSO2      HII 

...

Your question has been in discussion on a study by a team of astronomers in paper
Quote from: T. Böker, J. Falcón-Barroso
arXiv:0710.4036  A SINFONI view of Galaxy Centers: Morphology and Kinematics of five Nuclear Star Formation Rings
and also in
Star-Forming Nuclear Rings in Spiral Galaxies
They discussed about two scenarii
Quote
“Popcorn” or “Pearls on a String”?
In the first scenario, the gas accumulates along the ring, until a critical density is
reached. Presumably driven by turbulence (Elmegreen 1994), the ring then becomes unstable
to gravitational collapse, and star formation is induced. In this model, either the entire ring
structure begins to form stars at the same time, or individual hot spots collapse at random
times and locations within the ring. Either way, there should be no systematic age sequence
of hot spots along the ring. Because of its stochastic nature, we call this the “popcorn
model” of star formation.
In the second scenario, a short-lived, quasi-instantaneous “delta burst” of star formation
is induced in (and only in) a well-defined region along the ring where the gas density
becomes sufficiently high to ignite star formation. The precise location of this “overdensity
region” (ODR) depends on the details of the potential, but it is often found close to, and
somewhat downstream from where the gas enters the ring.

Interesting interpretation. Missed this paper earlier.