APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

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APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby APOD Robot » Fri Feb 17, 2017 5:12 am

Image Polar Ring Galaxy NGC 660

Explanation: NGC 660 is featured in this cosmic snapshot. Over 40 million light-years away and swimming within the boundaries of the constellation Pisces, NGC 660's peculiar appearance marks it as a polar ring galaxy. A rare galaxy type, polar ring galaxies have a substantial population of stars, gas, and dust orbiting in rings strongly tilted from the plane of the galactic disk. The bizarre-looking configuration could have been caused by the chance capture of material from a passing galaxy by a disk galaxy, with the captured debris eventually strung out in a rotating ring. The violent gravitational interaction would account for the myriad pinkish star forming regions scattered along NGC 660's ring. The polar ring component can also be used to explore the shape of the galaxy's otherwise unseen dark matter halo by calculating the dark matter's gravitational influence on the rotation of the ring and disk. Broader than the disk, NGC 660's ring spans over 50,000 light-years.

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Ann
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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby Ann » Fri Feb 17, 2017 6:03 am

Nice! :D NGC 660 is one of the classic polar ring galaxies. Today's APOD is a very nice portrait of it!

Mayall's Object, also known as Arp 148.
It is one of the truly weird polar ring galaxies.
Photo: NASA, ESA, the Hubble Heritage-ESA/
Hubble Collaboration, and A. Evans
At left, as you can see, is a truly weird polar ring galaxy, Mayall's Object or Arp 148.

Ann
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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby Boomer12k » Fri Feb 17, 2017 7:02 am

Ann wrote:Nice! :D NGC 660 is one of the classic polar ring galaxies. Today's APOD is a very nice portrait of it!

Mayall's Object, also known as Arp 148.
It is one of the truly weird polar ring galaxies.
Photo: NASA, ESA, the Hubble Heritage-ESA/
Hubble Collaboration, and A. Evans
At left, as you can see, is a truly weird polar ring galaxy, Mayall's Object or Arp 148.

Ann


Cool one, Ann!!!

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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby carlos_uriarte » Fri Feb 17, 2017 9:39 am

WOW IT's fantastic image!!!

tetrodehead

Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby tetrodehead » Fri Feb 17, 2017 10:33 am

Well done! The image is full of other galaxies. In the lower left, the edge-on and the blue galaxies are impressive.
Dave.

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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby starsurfer » Fri Feb 17, 2017 11:33 am

Ann wrote:Nice! :D NGC 660 is one of the classic polar ring galaxies. Today's APOD is a very nice portrait of it!

Mayall's Object, also known as Arp 148.
It is one of the truly weird polar ring galaxies.
Photo: NASA, ESA, the Hubble Heritage-ESA/
Hubble Collaboration, and A. Evans
At left, as you can see, is a truly weird polar ring galaxy, Mayall's Object or Arp 148.

Ann

Isn't this a collisional ring galaxy? Another polar ring galaxy is NGC 4650A.

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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby starsurfer » Fri Feb 17, 2017 11:34 am

What I find surprising about this amazing image is the number of HII regions visible without hydrogen alpha exposures! Also the two galaxies near the bottom left corner are 760 million light years away!

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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby Chris Peterson » Fri Feb 17, 2017 2:18 pm

starsurfer wrote:What I find surprising about this amazing image is the number of HII regions visible without hydrogen alpha exposures!

Why? We see HII regions all the time in RGB galaxy images, given that they are typically the dominant source of red light. It's in nebulas, where other emission lines are also strong and where there is much more reflected white light that Ha filters tend to really emphasize HII structure.
Chris

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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby bls0326 » Fri Feb 17, 2017 6:37 pm

This is the first I have heard of polar ring galaxies or seen a picture. I have been checking APOD pretty much daily since 2002 or so. Don't know how I missed them for so long. Quite spectacular.

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Re: APOD: Polar Ring Galaxy NGC 660 (2017 Feb 17)

Postby Ann » Sat Feb 18, 2017 5:51 am

starsurfer wrote:
Ann wrote:Nice! :D NGC 660 is one of the classic polar ring galaxies. Today's APOD is a very nice portrait of it!

Mayall's Object, also known as Arp 148.
It is one of the truly weird polar ring galaxies.
Photo: NASA, ESA, the Hubble Heritage-ESA/
Hubble Collaboration, and A. Evans
At left, as you can see, is a truly weird polar ring galaxy, Mayall's Object or Arp 148.

Ann

Isn't this a collisional ring galaxy?


You're right, starsurfer, but it looks like a polar ring galaxy, in any case.

Image
NGC 2685,
Photo: Ken Crawford.
Another classic polar ring galaxy is NGC 2685. Full size image is here.

Ann
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