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ASTRO: ZwCl400.4+0949, a "nearby" galaxy cluster



 
 
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Old July 13th 12, 05:58 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default ASTRO: ZwCl400.4+0949, a "nearby" galaxy cluster

This galaxy cluster is far too large for my 0.2 square degree field of
view. It has a diameter of 134 minutes for an area of just under 4
degrees or nearly 20 times my field of view. I did image its center
region however. The average distance of the cluster is about 270
million light-years. Major members of the cluster in my limited image
include:

NGC 5409 an interesting galaxy classed as (R')SAB(s)b
NGC 5416 a chaotic Sc or Scd spiral
NGC 5423 an S0 galaxy
NGC 5424 an S0 galaxy that appears to have a couple shells
NGC 5431 an apparent one arm spiral classed as S? More likely it is a
two armed spiral, possibly barred, whose arms overlap in a way to appear
as one arm.
NGC 5434 A classic Sc spiral
NGC 5434B/UGC 08967 an Sbc near edge on spiral
NGC 5436 a spiral classed as S0/a even though it has a strong dust lane

There is a faint stream of light heading east from NGC 5431 the S?
galaxy. It is seen in the Sloan images as well so is real. I don't
know if it is a plume from the galaxy or a faint nebulous patch of IFN
or something similar. Might be worthwhile spending many hours on it to
see if it can be determined which it is. For now I'm going with it
being a plume.

The only quasar in the image is [HB89] 1400+095. It is listed twice at
NED with two slightly different positions, one with a larger than normal
error circle. That less well defined entry lists it as an AbLS object
(Absorption Line System) with a redshift that puts it only 7.2 billion
light-years (z=0.868000) instead of 11.5 light-years (z=2.983090) of the
quasar labeled entry. It might be that the closer distance is the
redshift of the absorption lines while the further is that of the quasar
itself. In other words a gas cloud sits between us and the quasar
causing the absorption lines in the more distant quasar. At least that
is how I am interpreting this double entry. If anyone has a better idea
let me know.

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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