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  #1  
Old 17-07-2018, 05:25 PM
Placidus (Mike and Trish)
Narrowing the band

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NGC 6872 in Pavo - the largest spiral in the sky, and 100 friends

The big daddy elliptical in the centre is NGC 6876, centre of a cluster of galaxies in south-eastern Pavo.

We were drawn to this rich cluster of galaxies because of the tidal stretching of the edge-on spiral NGC 6872, which is in the top left corner of the thumbnail.

Notice the intense star formation in the very blue spiral arms. The arm heading downward gets fainter and broader, and then hooks around to the right in a very faint blue club-like end. In our image, this club can be seen to be resolved into several small star-forming regions.

The salmon-pink centre shows a distinct bar, with what looks like a very tiny active nucleus.

Wikipedia says that it is interacting with IC4970, a small lenticular. We can indeed see what looks like a bridge of bright blue stars between the two.

Wiki says that tip to tip, 6872 is half a million light years across, or five times the size of the Milky Way. NASA says this colossus is the largest spiral in the sky. Some folk liken it to the shape of a condor, but condors are not radially symmetrical, so we think of it as more like a badly bent paper-clip.

The thumb is a crop on the most interesting part of the busy cluster of galaxies.

Full frame here.

In the full frame, there are at least another 170 clearly visible more or less distant galaxies.

Aspen CG16M on 20 inch PlaneWave. Luminance 17 hrs, RGB 3 hrs each, all in 30 min subs.

North is on the left. Frame is approximately 30 min arc across, 0.55 sec arc/pixel.

Hope you like it too.
Attached Thumbnails
Click for full-size image (NGC 6872 SE Pavo Lum 17hrs RGB 3hrs each Thumb.jpg)
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Last edited by Placidus; 17-07-2018 at 06:12 PM.
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  #2  
Old 17-07-2018, 05:54 PM
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astroron (Ron)
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Fantastic work Mike and Trish,just spent 10 minutes touring the galaxies and also admiring the overall view.
Thanks for sharing
Cheers
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  #3  
Old 17-07-2018, 05:59 PM
Stevec35 (Steve)
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Nicely done M&T. This is a great galaxy group indeed.

Cheers

Steve
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  #4  
Old 17-07-2018, 06:09 PM
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atalas
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wow wee!what a field!hey some other little galaxies around showing tidal forces at work as well....man what an excellent piece of work guys
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  #5  
Old 17-07-2018, 06:27 PM
Placidus (Mike and Trish)
Narrowing the band

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Quote:
Originally Posted by astroron View Post
Fantastic work Mike and Trish,just spent 10 minutes touring the galaxies and also admiring the overall view.
Thanks for sharing
Cheers
Thanks very much Ron!

Quote:
Originally Posted by Stevec35 View Post
Nicely done M&T. This is a great galaxy group indeed.

Cheers

Steve
Thanks, Steve,

We've just spotted your version which produced an excellent result especially in the brighter areas in a fraction of the time.


Quote:
Originally Posted by atalas View Post
wow wee!what a field!hey some other little galaxies around showing tidal forces at work as well....man what an excellent piece of work guys
Thanks, Louie! We try to please. Glad you spotted the other tidally interacting pairs.

Mike Sidonio also produced a spectacular version of this cluster, as did Geoff Smith, but the link to his image doesn't want to talk to us right now.

Best,
Mike and Trish

Last edited by Placidus; 17-07-2018 at 08:17 PM.
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  #6  
Old 17-07-2018, 06:32 PM
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It probably feels ignored since he got his FSQ
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Old 17-07-2018, 07:25 PM
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A wonderful image.

Greg.
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Old 17-07-2018, 07:59 PM
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Ryderscope (Rodney)
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Gee whiz there is a lot going on there MnT. Galaxies galore with wonderful detail. A nice study of what goes on when galaxies interact.
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  #9  
Old 17-07-2018, 08:07 PM
Placidus (Mike and Trish)
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Quote:
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It probably feels ignored since he got his FSQ
Found another link to Geoff's image.

You can see the very faint club thingy that I mentioned.
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  #10  
Old 17-07-2018, 08:10 PM
Placidus (Mike and Trish)
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Quote:
Originally Posted by gregbradley View Post
A wonderful image.

Greg.
Thanks Greg!

Quote:
Originally Posted by Ryderscope View Post
Gee whiz there is a lot going on there MnT. Galaxies galore with wonderful detail. A nice study of what goes on when galaxies interact.
Thanks Rodney. They string each other along!
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  #11  
Old 17-07-2018, 08:23 PM
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Andy01 (Andy)
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impressive field and a great result, you guys are on a roll
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Old 17-07-2018, 08:38 PM
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Bart
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Ooooooh yeeaah, maaate!

That is awesome! My!
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  #13  
Old 18-07-2018, 08:26 AM
Placidus (Mike and Trish)
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impressive field and a great result, you guys are on a roll
Thanks very much Andy!

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Ooooooh yeeaah, maaate!

That is awesome! My!
Cheers, Bart, and welcome back . You've been away for a bit.
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  #14  
Old 18-07-2018, 08:45 AM
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It's a cool group of galaxies MnT. The image scale is excellent and I really like the colour. Detail as you would expect for a 20" scope. Nice work.
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  #15  
Old 18-07-2018, 10:48 AM
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strongmanmike (Michael)
Woohoo it's clear

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Great result guys, love this galaxy cluster, the Condor galaxy is so unusual in structure but magnificent and even more so when you learn its colossal size I was happy with my result from my (smaller) scope, your half metre aperture is rather useful though...have I ever mentioned that I would love your scope ...nice colour differentiation in the fine details too by the way

Mike
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  #16  
Old 18-07-2018, 02:39 PM
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Outstanding!!
So interesting.
Wow!
Cheers,
Tim
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  #17  
Old 18-07-2018, 04:43 PM
Placidus (Mike and Trish)
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Quote:
Originally Posted by Paul Haese View Post
It's a cool group of galaxies MnT. The image scale is excellent and I really like the colour. Detail as you would expect for a 20" scope. Nice work.
Thanks Paul. We're trying to find the magic point where the colour saturation is strong enough to see astrophysically important differences without a fight, just as one would hope to see astrophysically important brightness differences, or differences in position, without a fight, but no stronger.

Quote:
Originally Posted by strongmanmike View Post
Great result guys, love this galaxy cluster, the Condor galaxy is so unusual in structure but magnificent and even more so when you learn its colossal size I was happy with my result from my (smaller) scope, your half metre aperture is rather useful though...have I ever mentioned that I would love your scope ...nice colour differentiation in the fine details too by the way

Mike
Thanks hugely Mike. We're going to have to get you to come and stay over for a couple days some time soon. It's only a tiny four hour drive!

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Outstanding!!
So interesting.
Wow!
Cheers,
Tim
Thanks Tim!
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  #18  
Old 18-07-2018, 07:45 PM
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Atmos (Colin)
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Pretty incredible shot MnT! This is what your 20” Light bucket really excelled at
So many galaxies both big and small in the field to go looking at
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  #19  
Old 18-07-2018, 08:10 PM
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I think you've set a new benchmark for this field.

Everything is a little tighter, deeper and better resolved compared to what has gone before.

Why aspire to be average when you can be exceptional !

Wonderful stuff
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  #20  
Old 18-07-2018, 08:46 PM
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multiweb (Marc)
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Unreal!
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