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ASTRO: Arp 94



 
 
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  #1  
Old May 11th 08, 06:09 PM posted to alt.binaries.pictures.astro
Rick Johnson[_3_]
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Posts: 262
Default ASTRO: Arp 94

After a couple of non Arp galaxies (M106 and NGC 3079) that certainly
have peculiar aspects I'm returning to a few on Arp's list. We finally
had a short period of clear skies with the moon mostly out of the way.
Just enough to grab a quick series of this interacting pair. NGC 3226
and NGC 3227. The latter being the large spiral. I'd only seen the
black and white plates in Arp's atlas so was surprised by the huge
reddish dust cloud. To get that color dust normally is fluorescing due
to star light hitting it. This is normally not seen in dust lanes seen
from above as the galaxy's starlight isn't able to hit the dust
sufficient to cause anything but the edges to glow. This is seen in
many edge on galaxies as a red glow to the dust lane but as seen from
above the plane it is normally invisible. Yet here the entire cloud
seems to be glowing this characteristic red color. It must be well out
of plane so the stars below can illuminate it. That's the only thing I
can think of anyway. Even without this huge dust cloud the tidal clouds
on either side would make this a very interesting galaxy. The pair is
about 66 million light years away. NGC 3227 is classed in some NED
notes as a Seyfert 1 galaxy but one it is Seyfert 1.5 and yet another a
Seyfert 2. In any case the collision is likely helping to feed its
black hole.

To the right edge is the bright S0 galaxy NGC 3222 at 260 million light
years. Prior interactions appear to have ripped the dust right out of
it leaving no sign of it in the disk of the galaxy. Probably by the
same process that is now removing that large dust cloud from NGC 3227.
Come back in a billion years and 3227 likely will be an S0 as well.

There are two asteroids in the image. Their trails are very short and
steeply inclined to the ecliptic. This is because I caught them at the
end of their retrograde loop so much of their motion is vertical rather
than horizontal. The asteroid to the upper left is (111629) 2002 AZ137
at magnitude 19.7 and the one to the lower left is (176092) 2000 YK108
at magnitude 19.8.

The interacting pair of galaxies down and a bit left of NGC 3222 are
CGCG 1020.1+2002 and 2MASX J10224741+1947305 ID at a distance of 520
million light years. The 2MASX galaxy is the spiral on the left.

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

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

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  #2  
Old May 11th 08, 09:08 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: Arp 94

Great picture Rick. I especially like the second pair of interactors,
haven't seen them before.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...
After a couple of non Arp galaxies (M106 and NGC 3079) that certainly
have peculiar aspects I'm returning to a few on Arp's list. We finally
had a short period of clear skies with the moon mostly out of the way.
Just enough to grab a quick series of this interacting pair. NGC 3226
and NGC 3227. The latter being the large spiral. I'd only seen the
black and white plates in Arp's atlas so was surprised by the huge
reddish dust cloud. To get that color dust normally is fluorescing due
to star light hitting it. This is normally not seen in dust lanes seen
from above as the galaxy's starlight isn't able to hit the dust
sufficient to cause anything but the edges to glow. This is seen in
many edge on galaxies as a red glow to the dust lane but as seen from
above the plane it is normally invisible. Yet here the entire cloud
seems to be glowing this characteristic red color. It must be well out
of plane so the stars below can illuminate it. That's the only thing I
can think of anyway. Even without this huge dust cloud the tidal clouds
on either side would make this a very interesting galaxy. The pair is
about 66 million light years away. NGC 3227 is classed in some NED
notes as a Seyfert 1 galaxy but one it is Seyfert 1.5 and yet another a
Seyfert 2. In any case the collision is likely helping to feed its
black hole.

To the right edge is the bright S0 galaxy NGC 3222 at 260 million light
years. Prior interactions appear to have ripped the dust right out of
it leaving no sign of it in the disk of the galaxy. Probably by the
same process that is now removing that large dust cloud from NGC 3227.
Come back in a billion years and 3227 likely will be an S0 as well.

There are two asteroids in the image. Their trails are very short and
steeply inclined to the ecliptic. This is because I caught them at the
end of their retrograde loop so much of their motion is vertical rather
than horizontal. The asteroid to the upper left is (111629) 2002 AZ137
at magnitude 19.7 and the one to the lower left is (176092) 2000 YK108
at magnitude 19.8.

The interacting pair of galaxies down and a bit left of NGC 3222 are
CGCG 1020.1+2002 and 2MASX J10224741+1947305 ID at a distance of 520
million light years. The 2MASX galaxy is the spiral on the left.

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

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".



 




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