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ASTRO: Galactic Double Double plus an asteroid extravaganza



 
 
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Old December 3rd 11, 08:37 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default ASTRO: Galactic Double Double plus an asteroid extravaganza

Arp 306 is classed by Arp under his double galaxy class. It is located
in Pisces. Arp's comment: "Diffuse, hooked countertail." NED considers
this a double double galaxy much like Epsilon Lyra is a double double
star. Each of the main galaxies is listed by NED as being a merging
galaxy pair.

The larger galaxy pair is UGC 1102. The lower part is UGC 1102 NED01 at
76 million light-years while the main part of the galaxy is UGC 1102
NED02 with a redshift distance of 74 million-light years. This is the
object he refers to in his comment. The "hooked countertail" comes off
its north end. When giving the position of Arp 306 Arp used the
coordinates of this pair rather than a position between both pairs.

The smaller and fainter pair to the northeast is UGC 1105 with a
redshift distance of 79 million light-years. It doesn't have a redshift
for each part only one for the pair. UGC 1105 NED01 is the very blue
near starlike object toward the northern end of the galaxies core
region. The lower, ill-defined part is UGC 1105 NED02. NED's position
for the southern part is about the middle of the object where there is a
faint, double, condensation rather than the lower, bigger and brighter
condensation (all three appear about equal in the SDSS image however.
The lower one wasn't listed which surprised me. The only redshift value
given is for the pair.

Did Arp realize this was two pairs of interacting galaxies? If he did
he never mentioned it. Though he had little to say about any of his
entries, letting the category speak for itself. What comments he did
make added little to understanding the object, being only descriptive in
nature.

The only other object in the image with a redshift measurement is the
galaxy cluster NSCS J013202+044446 to the northwest of Arp 306. It is
listed at NED as having 20 members and a redshift distance of about 4.8
billion light years. No diameter is given so how many of the very faint
galaxies in this area are members I can't say.

This image contains more asteroids than I've ever captured on one image.
The L channel was taken over two nights which helps in the capture of
so many. 5 came from the first night under rather poor conditions while
the other 10 were seen the second night. One was in both images or
should have been but conditions were too poor so it barely shows in the
first night's image. Only part of its trail is visible that night. It
is 2006 QA3. Color data came from the second night. So only "bright"
asteroids from that night show a color trail.

Arp's image
http://ned.ipac.caltech.edu/level5/A...ig_arp306.jpeg

Besides the main image I've attached an annotated image for the
asteroids a cropped and enlarged image at 0.67" per pixel to match the
Sloan Digital Sky Survey image also attached.

14" LX200R @ f/10, L=8x10' RGB=2x10'x3, STL-11000XM, Paramount ME

Rick




--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

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