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ASTRO: Arp 056



 
 
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  #1  
Old December 1st 10, 07:10 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Arp 056

Arp 56 is in Arp's class: Spiral Galaxies with Companions on Arms:
Small, high surface brightness companions. It is considered an M51 type
system by some. Also known as UGC 1432, it is located in western Aries.
From its very small size you might think it very distant but it is
"only" 350 million light years distant by red shift measurement. These
must be very small galaxies. Some papers refer to the bright spot on
the end of the arm as a knot. It's color is quite different from the
galaxy so I suspect it is a separate object. While likely it is the
cause of the arm I can't find any red shift data for it nor any catalog
entry for it. NED has only one other galaxy's redshift noted in the
field. It looks more like a star. Go west (right) from the knot and
very slightly down. It is the first object you come to. Quite dim with
an even dimmer object just to its left. A smaller, fainter version of a
brighter pair a bit further west. It is the IR galaxy 2MASSi
J0157210+171248. While very faint in visible light it is 13th magnitude
in the infrared K filter. Visible light runs from 4000um (very violet)
to about 7000um (deep red). K filters are centered at 22000um or about
3 magnitudes redder than our eyes can see. In my image it is about 21st
magnitude! It is a Seyfert 1 galaxy about 2.6 billion light years
distant. The handful of galaxies NED identifies in the image are all IR
galaxies like this one. None have distance or magnitude estimates. Arp
made no comment about his one.

Arp's image:
http://nedwww.ipac.caltech.edu/level...big_arp56.jpeg

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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  #2  
Old December 11th 10, 08:19 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: Arp 056

Rick, this could be classified as a "pointing finger" type galaxy :-)

Stefan

"Rick Johnson" schrieb im Newsbeitrag
ster.com...
Arp 56 is in Arp's class: Spiral Galaxies with Companions on Arms:
Small, high surface brightness companions. It is considered an M51 type
system by some. Also known as UGC 1432, it is located in western Aries.
From its very small size you might think it very distant but it is
"only" 350 million light years distant by red shift measurement. These
must be very small galaxies. Some papers refer to the bright spot on
the end of the arm as a knot. It's color is quite different from the
galaxy so I suspect it is a separate object. While likely it is the
cause of the arm I can't find any red shift data for it nor any catalog
entry for it. NED has only one other galaxy's redshift noted in the
field. It looks more like a star. Go west (right) from the knot and
very slightly down. It is the first object you come to. Quite dim with
an even dimmer object just to its left. A smaller, fainter version of a
brighter pair a bit further west. It is the IR galaxy 2MASSi
J0157210+171248. While very faint in visible light it is 13th magnitude
in the infrared K filter. Visible light runs from 4000um (very violet)
to about 7000um (deep red). K filters are centered at 22000um or about
3 magnitudes redder than our eyes can see. In my image it is about 21st
magnitude! It is a Seyfert 1 galaxy about 2.6 billion light years
distant. The handful of galaxies NED identifies in the image are all IR
galaxies like this one. None have distance or magnitude estimates. Arp
made no comment about his one.

Arp's image:
http://nedwww.ipac.caltech.edu/level...big_arp56.jpeg

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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