NGC 2793 is another galaxy I'm surprised Arp didn't find a place for in
his Atlas of Peculiar Galaxies. It certainly is peculiar and quite
similar to Arp 6/NGC 2537 but with "wind effects". He has a category
for interacting galaxies he calls "Wind Effects". NGC 2793 certainly
appears to have a strong east wind blowing across it creating wispy blue
streaks across it. It also is a ring galaxy which he included but again
these were interacting galaxies. In fact ring galaxies like 2793 are
usually thought to be the result of a near direct hit on the core of a
spiral by a dense "bullet" galaxy. Yet there's no candidate for a
"bullet" in this case. I found only a couple papers discussing this.
They mention LEDA 082356 as a possible "bullet" saying it's redshift is
unknown. Turns out it is now known and at nearly 4 times the distance
can't be the cause. Neither paper considers the bright core might hide
a dense superimposed bullet nor has their apparently been any followup
studies of this galaxy. I find the rectangular core shape another
oddity. Usually the pushed to the ring the core takes on an arc that
matches the ring's arc. It may be this galaxy just naturally looks this
way but I find that hard to believe. The ring of star clusters along
the edge is hard to explain without some outside force being involved.

The long diameter of NGC 2793 measures about 29,000 light-years assuming
the 89 million light-year distance. It is located in southeastern Lynx
on the northwestern edge of the Abell 779 galaxy cluster. It isn't
related to that cluster which is about 320 million light-years distant.
It is likely the distant "companion" is an outlying member of the cluster.

The annotated image notes all galaxies in the field for which NED had
redshift data. If the galaxy had a name listed in NED other than just
one that was its coordinates it is noted. Otherwise a G denotes a
galaxy and Q a quasar. One stellar object was listed as a candidate
BLAGN (Broad Line Active Galactic Nucleus) which is likely a underfed
quasar or one hidden behind the galaxy's stars and dust. As light travel
time distances are rather questionable at such high redshifts the
redshift z value is also given for distant quasars when Z is greater than 1.

One asteroid was sneaking out of the frame in the lower right corner
when I started the luminance data and is noted in the annotated image.
One red frame was totally lost to clouds and the remaining frame very
noisy so red data is a questionable. I didn't realize this until I went
to process it months later and too late to reshoot.

14" LX200R @ f/10, L=4x10, R (poor)=1x10' GB=2x10', STL-11000XM,
Paramount ME

Rick

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