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ASTRO: Arp 44



 
 
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  #1  
Old January 10th 11, 09:58 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Arp 44

Arp 44/IC 609 is a rather distorted spiral galaxy in Sextans about 270
million light-years distant. Arp puts it in his category spiral
galaxies with companions on arms: Low surface brightness companions.
Apparently the two faint galaxies to the south are the companions Arp is
talking about. At least that's the conclusion of Kanipe and Webb in
their book on the atlas. Arp included both in his image. Most catalogs
only include the closer, brighter one however. I don't see either as
being on an arm. Arp left no comment to help decide this issue.

However there is another galaxy that might be the one Arp refers to. It
is due south of the western end of the faint south arm. It appears like
a star in my image. It is SDSS J102534.00-021344.5 but has no distance
data. I assume it is far beyond Arp 44. The galaxy most, including
NED, consider the companion is the obvious fuzzy galaxy south of Arp
44. It is UGC 05641(1). It's far beyond any arm of Arp 44 however and
far beyond Arp 44 in distance. Redshift shows it to be about 660
million light-year distant. More than twice as far as Arp 44.
Obviously it had nothing to do with the distortions seen in Arp 44.

The other galaxy in Arp's image, near the top right of center and quite
faint is SDSS J102538.22-021438.8. It has no redshift data but I can't
see it as having anything to do with Arp 44.

So what did distort Arp 44? Arp 44 is one of 4 galaxies in the in my
frame that are about 270 million light-years from us. Two are north and
east of Arp 44. They are quite small. I doubt they could be involved.
The 4th member is CGCG 009-022 toward the lower right corner. It is
large enough but doesn't appear sufficiently distorted. NGC 3243, a
large elliptical at 270 million light-years is just out of the image to
the southeast. It certainly is large enough but again, shows no sign of
being the culprit. Maybe this is the result of a merger. Seems
possible as there are a bunch of small galaxies at this distance in the
area.

There's one asteroid in the image, (45123) 1999 XH88 southeast of Arp 44

Arp's image
http://nedwww.ipac.caltech.edu/level...big_arp44.jpeg

SDSS image
http://astronomerica.awardspace.com/SDSS-3/IC609.php

14" LX200R @ f/10, L=4x10' RGB=2x10'x3, 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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Name:	ARP44L4X10RGB2X10X3-ID.jpg
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  #2  
Old January 16th 11, 10:09 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: Arp 44

Rick,

that's a good one. I guess I would have chosen the category "oversized outer
spiral arm" for it :-)

Stefan

"Rick Johnson" schrieb im Newsbeitrag
ter.com...
Arp 44/IC 609 is a rather distorted spiral galaxy in Sextans about 270
million light-years distant. Arp puts it in his category spiral
galaxies with companions on arms: Low surface brightness companions.
Apparently the two faint galaxies to the south are the companions Arp is
talking about. At least that's the conclusion of Kanipe and Webb in
their book on the atlas. Arp included both in his image. Most catalogs
only include the closer, brighter one however. I don't see either as
being on an arm. Arp left no comment to help decide this issue.

However there is another galaxy that might be the one Arp refers to. It
is due south of the western end of the faint south arm. It appears like
a star in my image. It is SDSS J102534.00-021344.5 but has no distance
data. I assume it is far beyond Arp 44. The galaxy most, including
NED, consider the companion is the obvious fuzzy galaxy south of Arp
44. It is UGC 05641(1). It's far beyond any arm of Arp 44 however and
far beyond Arp 44 in distance. Redshift shows it to be about 660
million light-year distant. More than twice as far as Arp 44.
Obviously it had nothing to do with the distortions seen in Arp 44.

The other galaxy in Arp's image, near the top right of center and quite
faint is SDSS J102538.22-021438.8. It has no redshift data but I can't
see it as having anything to do with Arp 44.

So what did distort Arp 44? Arp 44 is one of 4 galaxies in the in my
frame that are about 270 million light-years from us. Two are north and
east of Arp 44. They are quite small. I doubt they could be involved.
The 4th member is CGCG 009-022 toward the lower right corner. It is
large enough but doesn't appear sufficiently distorted. NGC 3243, a
large elliptical at 270 million light-years is just out of the image to
the southeast. It certainly is large enough but again, shows no sign of
being the culprit. Maybe this is the result of a merger. Seems
possible as there are a bunch of small galaxies at this distance in the
area.

There's one asteroid in the image, (45123) 1999 XH88 southeast of Arp 44

Arp's image
http://nedwww.ipac.caltech.edu/level...big_arp44.jpeg

SDSS image
http://astronomerica.awardspace.com/SDSS-3/IC609.php

14" LX200R @ f/10, L=4x10' RGB=2x10'x3, 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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