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ASTRO: UGC 6309



 
 
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Old July 22nd 14, 03:45 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default ASTRO: UGC 6309

UGC 6309 is a strange galaxy in Ursa Major south of the bowl of the "Big
Dipper" portion of the constellation, 140 to 160 million light-years
away. It is classed as SB?. It certainly is a barred spiral so that
can't be what the question mark is questioning. Maybe it is referring
to the odd arm structure that really doesn't fit the a, b, c, d
classification system. Also it has plumes off the northwestern side.
Barred spirals often form pseudo ring structures with the arms coming
off the ends of the bar overlapping to form a ring though each only
covers a bit over 180 degrees. Here things are somewhat screwed up.
The northwestern bar forms a ring like arm but it is distorted beyond
the end of the southeastern bar. The arm coming off the southeastern
bar is strange indeed not smoothly translating into the ring. It is
either short and ends at the ring formed off the other bar or hits that
point at right angles and making a sudden 90 degree turn and then
overlapping the arm from the northwestern bar which may end up making a
full 360 degree ring. Since the two overlap its hard to tell. In any
case the ring is very egg shaped. Then there's the huge rather faint
plume going beyond the ring to the northwest. All this would indicate
the galaxy has had an interaction with another galaxy. Though except
for MRK 1445 and ASK 184885.0 both to the southwest there are no
candidates. Being a blue compact galaxy it is possible MRK 1445 may be
involved or else UGC 6309 has merged with a small galaxy though no sign
of it remains I can detect.

All objects NED listed with redshift values are noted in the annotated
image. If identified only by its coordinates I've just labeled it G or
Q depending on if it is a galaxy or quasar. One is listed in NED as
both so carries both labels. It's PSF on my image is a bit different
than that of a star but not quite that of a distant galaxy. I suspect I
picked up mostly the point source massive black hole quasar at its core
plus some hints of the galaxy it is in resulting in a PSF that isn't
quite correct for either at my resolution level.

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

Rick
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Prefix is correct. Domain is arvig dot net

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