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ASTRO: NGC 3090



 
 
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Old August 11th 14, 06:39 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default ASTRO: NGC 3090

NGC 3090 appears to be the anchoring galaxy for a loose group of
galaxies about 300 million light-years from us. I find two groups listed
at NED, WBL 248 consists of the 7 major galaxies in the group while MZ
03587 more than doubles that number considering the many small dwarf
galaxies in the group that are almost starlike in my image. NGC 3090 is
a huge elliptical galaxy. Assuming its redshift look back time is right
at 290 million years then the galaxy is 200,000 light-years across. Its
outer regions sort of fade away making it hard to pin down a size though
the eastern edge seems rather sharp as if it is an arc of a shell left
over from one of the many mergers that likely created this large galaxy.
I find very little on this group in the literature however. It seems
to have only one galaxy still giving birth to stars at a decent rate,
that is LEDA 1080545, a very blue spiral that really stands out among
the field of rather red and dead galaxies that make up this group. FGC
114A in the lower left corner appears rather warped to my eye. A
surprising number of them in my images seem curved like this one.
Rarely is a disturbing galaxy in the area. This time there are several
small galaxies at about its distance nearby though none look disturbed.
A few are rather dense so might be able to warp a low mass flat galaxy
without being noticeably distorted in the process.

The annotated image notes all galaxies for which NED had redshift data.
Those over a billion light-years distant were usually identified only
by their coordinates so are shown only as G in the annotated image. The
few quasars are noted by Q. NED is now including quasar candidates with
photographic distance estimates. These are quite iffy so I'm not
including them unless they are also strong in UV light, a good indicator
of a quasar. I did include one however that is quite blue in my image
even though it wasn't listed as a UV source. I can't say it is any more
likely to be correctly categorized as a quasar but the blue color can be
an indicator.

There's one asteroid identified in the image. I found a second in the
raw FITS but it was too faint to make it into a color composite image.
Conditions went down hill as I took this data as shown by the asteroid
trail getting fainter as it moved northwest during the 40 minutes of the
exposure. Color data, mainly green and red, taken after the luminance
were hit even worse, with the great very weak. I had to include some
pseudo green created from the red and blue data much as is done when
making a color image from red and blue POSS plates though with some
green data to help guide the process. Also seeing was off and on lousy
during the color data phase bothering some stars more than others and
creating color arcs on some stars and not others. I tried deconvolving
the red and green to match the blue but was not totally successful. Due
to the increasing clouds this image doesn't go as deep as usual.

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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