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ASTRO: NGC 3346 A rarely imaged, detailed, face on blue galaxy



 
 
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  #1  
Old November 1st 13, 06:41 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: NGC 3346 A rarely imaged, detailed, face on blue galaxy

NGC 3346 is a face on barred spiral in Leo north of M105. Both redshift
and Tully Fisher measurements put its distance at 73 million
light-years. NED classifies it as SB(rs)cd while the NGC project says
SBc. In any case it has a nice mix of spiral arms and spurs. It is
quite blue indicating recent star formation. Even the core is bluer
than I expected. With all the blue star clouds I expected to find some
HII regions show up but there's only a hint of a couple in my image. A
note at NED indicates the authors of the paper failed to resolve the
expected HII regions as well so I can't feel too bad about missing them.

The image contains many galaxy clusters listed at NED. Most have a
Bright Cluster Galaxy that I used for the center if it was within 1" of
arc of the center position. In most cases both the cluster and the
Bright Cluster Galaxy had the same photographically determined redshift.
In those cases I listed only one distance with a "p" to indicate the
photographic nature of the distance estimate. If they were different
then the second distance is that of the galaxy. If no "p" then it was
spectroscopically determined and likely the better value. In a few
cases the distances to a cluster were listed by NED as "Estimated".
Those are indicated with an "e".

Many of the clusters seem themselves clustered. Often they have similar
galaxy counts. Usually they came from different catalogs. I have to
wonder if these clusters of clusters are really looking at the same
galaxies but have determined the centers and sizes of the groups (none
gave a radius or diameter) differently but are really referring to some
of the same galaxies. If the line drawn doesn't end in a galaxy then
there was no bright cluster galaxy listed and the line points to the
position given for the center. In such cases the error bars were often
15 to 30 seconds of arc so included many possible galaxies for the
center one. Some clusters have no core galaxy making such a hunt futile.

The image contains 3 asteroids. I've noted them in the annotated image.
A few edge on galaxies are seen in the image that are good asteroid
imposters. I check each out and they all were real galaxies.

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 November 13th 13, 10:25 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default ASTRO: NGC 3346 A rarely imaged, detailed, face on blue galaxy

Rick,

I have this one on my list marked "++", but did not manage to image it.
You habe captured a remarkable image of this fine galaxy.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...

NGC 3346 is a face on barred spiral in Leo north of M105. Both redshift
and Tully Fisher measurements put its distance at 73 million
light-years. NED classifies it as SB(rs)cd while the NGC project says
SBc. In any case it has a nice mix of spiral arms and spurs. It is
quite blue indicating recent star formation. Even the core is bluer
than I expected. With all the blue star clouds I expected to find some
HII regions show up but there's only a hint of a couple in my image. A
note at NED indicates the authors of the paper failed to resolve the
expected HII regions as well so I can't feel too bad about missing them.

The image contains many galaxy clusters listed at NED. Most have a
Bright Cluster Galaxy that I used for the center if it was within 1" of
arc of the center position. In most cases both the cluster and the
Bright Cluster Galaxy had the same photographically determined redshift.
In those cases I listed only one distance with a "p" to indicate the
photographic nature of the distance estimate. If they were different
then the second distance is that of the galaxy. If no "p" then it was
spectroscopically determined and likely the better value. In a few
cases the distances to a cluster were listed by NED as "Estimated".
Those are indicated with an "e".

Many of the clusters seem themselves clustered. Often they have similar
galaxy counts. Usually they came from different catalogs. I have to
wonder if these clusters of clusters are really looking at the same
galaxies but have determined the centers and sizes of the groups (none
gave a radius or diameter) differently but are really referring to some
of the same galaxies. If the line drawn doesn't end in a galaxy then
there was no bright cluster galaxy listed and the line points to the
position given for the center. In such cases the error bars were often
15 to 30 seconds of arc so included many possible galaxies for the
center one. Some clusters have no core galaxy making such a hunt futile.

The image contains 3 asteroids. I've noted them in the annotated image.
A few edge on galaxies are seen in the image that are good asteroid
imposters. I check each out and they all were real galaxies.

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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