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Thread: Arp 149 A very disturbed pair

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  1. #1
    Join Date
    Dec 2006

    Arp 149 A very disturbed pair

    Arp 149, IC 803, is a pair of interacting galaxies in Coma Berenices about 370 million light-years away. Arp put it in his category: Galaxies with Jets. He made no comment on this one. I'm not sure what he is seeing as the jet. Is it the very faint plume to the northwest coming from the eastern (left) galaxy or is it the much brighter plume from the western one to the southwest? I have no idea.

    This was taken a night of very good seeing that didn't last. I need at least 100 minutes of L data (160 or more would be better) when imaging at 0.5" per pixel. But seeing went south and I was able to use only 80 minutes of data and preserve the resolution I was getting. In fact the image is slightly undersampled on the 7 usable frames I obtained! That only happened once before. Galaxies down to 23rd magnitude are seen on the processed image. Not bad for such noisy data.

    There are a ton of great galaxies in this image, in fact the vast majority of the "stars" in this image (except the blue ones) are actually galaxies. If it isn't perfectly round or quite bright then it's likely a galaxy. I could identify nearly 1000 on this 0.0516 square degree field. Unfortunately, this is another field that NED has entered SDSS data for but that data seems to contain no red shift data. So, again, I didn't bother an annotated image as all it would contain is the coordinates of the galaxy which is how Sloan images are cataloged.

    Not only didn't Arp have any comment on this pair, I found virtually nothing on it.

    The asteroid above the bright star near the top of the image right of center is (32122) 2000 LD10 at magnitude 19.2. About 3 minutes further west and a tad south is the much shorter and fainter trail of 2010 EW38 at magnitude 20.1.

    Arp's image

    When this is all Arp could see with the 200" scope my image suddenly doesn't look so poor after all.

    14" LX200R @ f/10, L=8x10'x1, RGB=2x10', STL-11000XM, Paramount ME

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    Last edited by RickJ; 2010-Dec-31 at 10:18 PM.

  2. #2
    Join Date
    Sep 2005
    "Happy New Year's Rick!, Very disturb they are and a pretty dense of galaxies in this region-Nice!.

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