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IC 65 a rarely seen unsymmetrical spiral galaxy

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#1 Rick J

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Posted 19 September 2013 - 01:36 PM

IC 65 is a somewhat non symmetrical spiral about 110 million light-years distant in the constellation of Andromeda north of the famous Andromeda galaxy, M31. It classed as SAB(s)bc. Is it naturally unsymmetrical or is this the result of an encounter with another galaxy. It is a member of a very small, sparse group known as the IC 65 group. So sparse I can identify only one other member of the group in my image. That is [VH2008] J0101+4744. A very small dwarf galaxy to the northeast. Further southeast is [VH2008] J0100+4734 which I really wanted to know more about as it seems to consist of several condensations. Unfortunately NED has no distance data and only an approximate position making it impossible to tell if it refers to all the parts or just some or even one of them. There is a larger member of the group out of the picture several minutes of arc above the top of my field. Not knowing it at the time I centered on IC 65 so missed it. The only other galaxy with distance data is MCG +08-03-003, the obvious elliptical galaxy to the northwest of IC 65. It however is much more distant at 630 million light-years. I found little on the field.

IC 65 is nearly 140,000 light-years across, making it a very large spiral. While [VH2008] J0101+4744 is only about 12,000 light-years in diameter, less than 10% the size in area and 1% in volume. There may be a small round galaxy at its eastern end. The orange elliptical MCG +08-03-003 is very large at about 175,000 light-years. I'd expect such a galaxy to anchor a group but I found nothing to indicate that was the case with MCG +08-03-003.

Many other galaxies are visible in the image. Only 10 are even listed at NED. I listed them all in the annotated image. Most had no distance information so are just listed by catalog name. [VH2008] is the Vennik, Hopp catalog. The 4C object is from the Fourth Cambridge Radio Catalogue indicating this galaxy was first found by its strong radio emission. It is listed in the 1RXS (ROSAT All-Sky Survey Bright Source Catalog of X-ray sources) and the 2MASX IR object catalog. It covers a rather wide spectrum. NED however doesn't list it in an ultra-violet catalog. The vast majority of galaxies in the image are apparently anonymous. I hope their inhabitants aren't offended by that slight.

I had a very nasty reflection to the east of IC 65 cause unknown. I get these sort of triangular shaped "features" every once in a while. If I see them in the first frame I move the field a couple minutes and they vanish. When the main object is off center a bit that is likely why. In this case the image was taken automatically so I wasn't available and didn't find it until I went to process the image. I cloned it out. But you will note there is quite a bit of scattered background light. Some of the brightest to the east where I removed the reflection. Since the glow appeared on all sides of the reflection I cloned it in rather than leaving the area as black as areas without the glow. What I don't know is if this is real or a bigger reflection issue. I tried enhancing the POSS plates but no hint of it turned up. Though areas of Andromeda do have rather ill defined galactic cirrus. Not being an expert on galactic cirrus I don't know if that is what I picked up or not. In case it is real I left it in. I need to retake the field with a different camera pointing to verify which is the case. Normally I'd trust it to be real but since it could be related to the obvious reflection issue I am not as confident that it is real.

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

Full image at 1" per pixel

Annotated (barely)

Rick

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#2 lambermo

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Posted 19 September 2013 - 03:16 PM

Nice galaxy. Not much of it online as well, I found http://cseligman.com...s/ic0a.htm#ic65 for comparison.

#3 rigel123

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Posted 19 September 2013 - 04:42 PM

Excellent Rick, love the write up!

#4 hytham

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Posted 19 September 2013 - 05:39 PM

Brilliant write up, and image. Lots of very faint fuzzies captured in that background

#5 raf1

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Posted 20 September 2013 - 12:37 AM

Thanks for the annotated image Rick. Good job.

Ron

#6 Ron (Lubbock)

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Posted 20 September 2013 - 03:39 PM

Nice pic of a galaxy I've probably never seen imaged. I also have a nasty reflection problem in my system right now, and like the OP's, it disappears if I move the tube a few arcminutes. Very frustrating, and virtually impossible to process out once the damage is done.

#7 jshalpha

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Posted 21 September 2013 - 11:04 AM

Nice image Rick and great write up as always.

Jim S.

#8 mmalik

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Posted 21 September 2013 - 12:09 PM

Another beautiful image from you!

#9 neptun2

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Posted 22 September 2013 - 02:10 AM

Perfect image as always and very interesting object also. :)

#10 PatHolland

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Posted 22 September 2013 - 02:17 PM

Thanks for sharing Rick. Like many others, I did not know this galaxy existed before your excellent image and write-up.






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