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Yet another galaxy image NGC 23 and NGC 26

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#1 Rick J

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Posted 18 July 2013 - 03:00 PM

Two galaxy images in a row for those that have been asking when I'd return to galaxies. This one not lost on the hard drive like Arp 163 was.

NGC 23 and NGC 26 are a pair of galaxies about 195 million light-years distant in the constellation of Pegasus about three degrees south of Alpheratz. NGC 23, the northwestern member, is classed by NED as SB(s)a;HII;LIRGSbrst while the NGC project says simply SB(s)a. HII means it has rather strong H alpha emission. This can be seen in the HST image at: http://commons.wikim...110-160-190.jpg which shows just the very core of the galaxy out less than 10" of arc. LIRGSbrst means it is a luminous infrared galaxy with starburst activity. This too is found in a region less than 10" from the galaxy's core. In any case the galaxy appears somewhat disturbed so has likely interacted with some other galaxy, possibly NGC 26 10 minutes to the southeast which also appears disturbed. It is very non symmetrical both as to the barred region which is much more organized to the north than to the south and the outer arms. The southern bar region seems to consist mostly of two bright star clouds. Off of each end are two the two faint arms. The one coming off the northern end and running down the western side is much brighter and condensed than the one coming off the disorganize southern end. The latter extends faintly well to the north more as a tidal plume than a spiral arm.

NGC 26 is classed by NED and the NGC project as SA(rs)ab. While a simple classification its structure is odd. Coming off the core on the eastern side is a bright arm arc that quickly ends. There seems to be no similar arm on the western side though one is hinted at in the DSS IR image. This is surrounded by a lopsided ring of rather white stars. Outside this is an arc of blue stars that circles about two thirds of the way around becoming a narrow dark lane to the south. Outside of these are faint spiral arms, the eastern one being very large and much brighter than the smaller western one. It is as if something pulled the entire structure but for the core to the east, the less dense the structure the more it was pulled off center. One very old paper indicated this might be due to a dwarf galaxy it ate sometime in the past.

While there are many other galaxies in the image NED had little on them, not even a magnitude in most cases. Due to the lack of information I didn't prepare an annotated image. Sure looks like it would have been interesting if the data had been available.

This is another field suggested to me by Sakib Rasool.

14" LX200R @ f/10, L=4x10' RGB=2x10' STL-11000XM, Paramount ME

Full image at 1" per pixel

Cropped attached image at 0.8" per pixel.

Rick

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#2 jerryyyyy

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Posted 18 July 2013 - 05:30 PM

Nice work, if you had a non-backed-up hard drive crash, have you heard of SpinRite? Worth a look if you are stuck.

#3 Rick J

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Posted 19 July 2013 - 01:42 PM

After loosing nearly all my film data when a severe storm dropped a huge oak through the roof into the room where all that was stored I backup data both here and in the bank vault 20 miles away. Data not in the vault is in the cloud but with over 4 terabytes I can't afford to put anything but the last few weeks in the cloud. When weather is good I can get 50 gig in a month so it adds up quickly. Of course a good month hasn't happened for a long time now thanks to the angry weather gods or something. So far I've not had a hard disk crash though on more than one occasion I accidentally wiped files from the drive but since even when I take the data it goes two place, computer drive and an external network drive, nothing was lost.

But with those 4 terabytes I do sometimes lose track of the fact I imaged an object as happened with Arp 163 and another I'm just now processing. Probably a few more that somehow fell through the cracks waiting to be discovered. It doesn't help that objects go by many names and may be on the to-do list on one name, get taken but recorded on the to-processes list under a different common name and then after processing and research moved to the finished list under a third name. I call this the Tower of Babel effect. No matter how well I try to log everything sometimes it gets lost in all those bytes on several hard drives.

Rick

#4 Jim Thommes

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Posted 20 July 2013 - 12:26 AM

That's a nice pair - they look good together. I guess PGC00654 is a galaxy just to the south that didn't quite make your image field.

#5 Rick J

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Posted 20 July 2013 - 01:37 AM

I'd have had to move south several minutes putting NGC 23 right near the top of the frame. Even harder to get was PGC 772 and its very faint companion. I'd sort of wanted to get that pair in the image but my FOV just wouldn't cooperate unless I rotated the camera about 45 degrees counter clockwise. As yet I don't have a rotator.

Rick

#6 mmalik

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Posted 20 July 2013 - 03:45 AM

Beautiful galaxies Rick!

#7 Mark72

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Posted 20 July 2013 - 11:52 AM

Nice pair Rick,

Thanks for sharing and information.

Mark

#8 bill w

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Posted 21 July 2013 - 10:01 AM

beautiful field rick
thanks for the write up

#9 mmalik

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Posted 22 July 2013 - 12:35 AM

Beautiful pairing of the galaxies






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