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ASTRO: Zwicky's Connected Multiple System -- Arp 73



 
 
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  #1  
Old March 3rd 10, 10:44 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Zwicky's Connected Multiple System -- Arp 73

Arp 103 is also known as Zwicky's Connected Multiple System or Zwicky's
Triplet depending on who you read. It consists of three galaxies. They
have many different designations, none all that common. NED prefers UGC
10586 Notes 3, UGC 10586 Notes 4 and UGC 10586 Noted 5. Also in the
image are UGC 10586, UGC 10586 Notes 1 and UGC 10586 Notes 2. So by the
UGC it is a 6 galaxy system. UGC 10586 notes 2 is better known as NGC
6241. These galaxies are located in the constellation of Hercules at a
distance of about 425 million light years. It consists of two southern
galaxies, Notes 3 and 4 and a northern galaxy 2.5 minutes north. A
faint arm connects Notes 3 and 5. Several knots are seen in it. About
half way between the two is another faint arm running at near right
angles to the connecting arm which contains a broad extension on the
western side. It is only hinted at in Arp's image but appears rather
obvious in mine. Also not seen well in Arp's image is the large splash
of stars that surrounds the southern pair. The knots in the connecting
arm appear somewhat blue indicating new stars.

Arp classed this triplet under Elliptical and elliptical-like galaxies
connected to spirals. NED classes the three galaxies as: Notes 3
SAB(rs)0+ pec, Notes 4 S0 pec: and Notes 5 as SAB0^+(rs) pec in one
reference. None are listed as elliptical but all as simply S0. So
elliptical like fits but which is the spiral? His only comment just
says: "Incomplete connection, blue knots in south member." My image
seems to show the connection is complete, not only in the narrow tail
but a fainter broad tail as well.

You've probably guessed the other two major galaxies in the image are
two of the three other parts of the UGC 10586 system. The bright spiral
east of Arp 103 is UGC 10586 Notes 2, better known as NGC 6241, an Sbc
spiral with lots of bright knots in its arms. They are more white than
blue. Still, it looks like an active galaxy. It's red shift distance
puts it at about 410 million light-years. The difference is likely just
due to orbital motion about the groups center of gravity and really at
about the same distance as Arp 103.

UGC 10586 is the remaining face on spiral further east than NGC 6241.
Why do all of these appear to be face on? The note at NED for this
galaxy belongs with Arp 103 not this galaxy. UGC 10586 is a face on Sb
spiral that has a rather faint arm compared to the others. Apparently
that wasn't odd enough to make Arp's catalog. Sure seems unusual to me.
It has a red shift distance of 424 million light-years, same as Arp 103.

So where is the missing UGC 10586 Notes 1? It is the small blue galaxy
just beyond the northeast edge of UGC 10586 near a bright yellow-white
star. It seems rather distorted with both a blue and white region with
an arm jutting out the south side. I can't find any distance or
classification on this one. The red galaxy to the southwest of UGC
10586 is 2MASX J16504319+4523545, again not much on it. Why it too
isn't listed as part of the UGC 10586 system I don't know.

Unfortunately this paucity of information pertains to the rest of the
image. Even though the SDSS lists nearly 3000 galaxies in this field
only 5 of the 6 members of the UGC 10586 system have any redshift data.

I found no SDSS images of this group on the net so made some from the
SDSS site which are attached here at the same 1" per pixel resolution I
took these at. I've also attached a 0.5" per pixel enlargement which on
my monitor shows the connection between the southern and northern
members of Arp 103 better than the original scale of 1" per pixel.

Arp's image is at:
http://nedwww.ipac.caltech.edu/level...ig_arp103.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 March 4th 10, 07:02 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default ASTRO: Zwicky's Connected Multiple System -- Arp 73

Make that Arp 103.
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".
  #3  
Old March 10th 10, 11:48 AM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default ASTRO: Zwicky's Connected Multiple System -- Arp 73

Rick,

this is a weird assortment of galaxies. I also like the two spirals.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
. com...
Arp 103 is also known as Zwicky's Connected Multiple System or Zwicky's
Triplet depending on who you read. It consists of three galaxies. They
have many different designations, none all that common. NED prefers UGC
10586 Notes 3, UGC 10586 Notes 4 and UGC 10586 Noted 5. Also in the
image are UGC 10586, UGC 10586 Notes 1 and UGC 10586 Notes 2. So by the
UGC it is a 6 galaxy system. UGC 10586 notes 2 is better known as NGC
6241. These galaxies are located in the constellation of Hercules at a
distance of about 425 million light years. It consists of two southern
galaxies, Notes 3 and 4 and a northern galaxy 2.5 minutes north. A
faint arm connects Notes 3 and 5. Several knots are seen in it. About
half way between the two is another faint arm running at near right
angles to the connecting arm which contains a broad extension on the
western side. It is only hinted at in Arp's image but appears rather
obvious in mine. Also not seen well in Arp's image is the large splash
of stars that surrounds the southern pair. The knots in the connecting
arm appear somewhat blue indicating new stars.

Arp classed this triplet under Elliptical and elliptical-like galaxies
connected to spirals. NED classes the three galaxies as: Notes 3
SAB(rs)0+ pec, Notes 4 S0 pec: and Notes 5 as SAB0^+(rs) pec in one
reference. None are listed as elliptical but all as simply S0. So
elliptical like fits but which is the spiral? His only comment just
says: "Incomplete connection, blue knots in south member." My image
seems to show the connection is complete, not only in the narrow tail
but a fainter broad tail as well.

You've probably guessed the other two major galaxies in the image are
two of the three other parts of the UGC 10586 system. The bright spiral
east of Arp 103 is UGC 10586 Notes 2, better known as NGC 6241, an Sbc
spiral with lots of bright knots in its arms. They are more white than
blue. Still, it looks like an active galaxy. It's red shift distance
puts it at about 410 million light-years. The difference is likely just
due to orbital motion about the groups center of gravity and really at
about the same distance as Arp 103.

UGC 10586 is the remaining face on spiral further east than NGC 6241.
Why do all of these appear to be face on? The note at NED for this
galaxy belongs with Arp 103 not this galaxy. UGC 10586 is a face on Sb
spiral that has a rather faint arm compared to the others. Apparently
that wasn't odd enough to make Arp's catalog. Sure seems unusual to me.
It has a red shift distance of 424 million light-years, same as Arp 103.

So where is the missing UGC 10586 Notes 1? It is the small blue galaxy
just beyond the northeast edge of UGC 10586 near a bright yellow-white
star. It seems rather distorted with both a blue and white region with
an arm jutting out the south side. I can't find any distance or
classification on this one. The red galaxy to the southwest of UGC
10586 is 2MASX J16504319+4523545, again not much on it. Why it too
isn't listed as part of the UGC 10586 system I don't know.

Unfortunately this paucity of information pertains to the rest of the
image. Even though the SDSS lists nearly 3000 galaxies in this field
only 5 of the 6 members of the UGC 10586 system have any redshift data.

I found no SDSS images of this group on the net so made some from the
SDSS site which are attached here at the same 1" per pixel resolution I
took these at. I've also attached a 0.5" per pixel enlargement which on
my monitor shows the connection between the southern and northern
members of Arp 103 better than the original scale of 1" per pixel.

Arp's image is at:
http://nedwww.ipac.caltech.edu/level...ig_arp103.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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