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ASTRO: NGC 5899 and NGC 5900



 
 
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  #1  
Old December 19th 13, 07:47 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: NGC 5899 and NGC 5900

NGC 5899 and NGC 5900 are a pair of "non interacting" galaxies north of
the "kite" of Bootes. Red shift puts them about 120 million light-years
distant. I put "non interacting" in quotes as I'm not convinced that is
the case. Both have large faint halos. That of NGC 5900 seems to point
down toward NGC 5899. The spiral structure of NGC 5899 seems quite
unusual with one heavy arm defined by many bright star clouds of newly
formed stars. The arm on the other side is hard to define. Most of the
disk is full of irregular star streams that have only a vague spiral
pattern to them. NGC 5900 has an intense red dust lane often seen in
interacting spirals seen edge on. Three other NGC galaxies are in the
image NGC 5893, 5895 and 5896. A 6th NGC object turns out to be just a
field star, NGC 5901.

NGC 5896 is classed by the NGC project as a compact galaxy. Though it
appears to be a spiral galaxy with rather tightly wound spiral arms,
especially the northern one. NED didn't try to classify it. NGC 5895
was also not classified by NED though the NGC project says Sc. The
barred spiral NGC 5893 has mostly featureless spiral arms though the
southern one has a detached part that is full of bright star clouds. On
the northeastern side is a object NED classifies as a separate galaxy
with a redshift nearly identical to NGC 5893. Is it really a separate
galaxy or another star cloud? I've marked it as a galaxy in the
annotated image though I am not certain this is the case. Though it
could be the remains of a cannibalized galaxy's core. That would
account for NGC 5893's odd spiral structure that makes it look somewhat
like the CBS eye as well as the large plumes beyond the main arm structure.

This was taken on a night of rather good transparency compared to what
I'd been seeing for many months. Still not up to what used to be a good
night. Still galaxies down past 23rd magnitude are seen in the image.
I'd been lucky to hit 21st magnitude for many months. This allowed me
to note many galaxy clusters in the image. Several are seen north of
NGC 5899.

The 6th magnitude M2 giant star sent nasty glare across much of the
field. While not as nasty as I get from blue stars it was no fun to
deal with.

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

Rick
--
Prefix is correct. Domain is arvig dot net

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  #2  
Old December 22nd 13, 08:34 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: NGC 5899 and NGC 5900

Beautiful image Rick.
NGC 5893 in the lower right corner is a nice galaxy too.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...

NGC 5899 and NGC 5900 are a pair of "non interacting" galaxies north of
the "kite" of Bootes. Red shift puts them about 120 million light-years
distant. I put "non interacting" in quotes as I'm not convinced that is
the case. Both have large faint halos. That of NGC 5900 seems to point
down toward NGC 5899. The spiral structure of NGC 5899 seems quite
unusual with one heavy arm defined by many bright star clouds of newly
formed stars. The arm on the other side is hard to define. Most of the
disk is full of irregular star streams that have only a vague spiral
pattern to them. NGC 5900 has an intense red dust lane often seen in
interacting spirals seen edge on. Three other NGC galaxies are in the
image NGC 5893, 5895 and 5896. A 6th NGC object turns out to be just a
field star, NGC 5901.

NGC 5896 is classed by the NGC project as a compact galaxy. Though it
appears to be a spiral galaxy with rather tightly wound spiral arms,
especially the northern one. NED didn't try to classify it. NGC 5895
was also not classified by NED though the NGC project says Sc. The
barred spiral NGC 5893 has mostly featureless spiral arms though the
southern one has a detached part that is full of bright star clouds. On
the northeastern side is a object NED classifies as a separate galaxy
with a redshift nearly identical to NGC 5893. Is it really a separate
galaxy or another star cloud? I've marked it as a galaxy in the
annotated image though I am not certain this is the case. Though it
could be the remains of a cannibalized galaxy's core. That would
account for NGC 5893's odd spiral structure that makes it look somewhat
like the CBS eye as well as the large plumes beyond the main arm structure.

This was taken on a night of rather good transparency compared to what
I'd been seeing for many months. Still not up to what used to be a good
night. Still galaxies down past 23rd magnitude are seen in the image.
I'd been lucky to hit 21st magnitude for many months. This allowed me
to note many galaxy clusters in the image. Several are seen north of
NGC 5899.

The 6th magnitude M2 giant star sent nasty glare across much of the
field. While not as nasty as I get from blue stars it was no fun to
deal with.

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

Rick
--
Prefix is correct. Domain is arvig dot net

 




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