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  1. #1
    Rick Johnson's Avatar
    Rick Johnson Guest

    Default 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:

    14" LX200R @ f/10, L=4x10' RGB=2x10'x3, STL-11000XM, Paramount ME


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

    Attached Images Attached Images

  2. #2
    Rick Johnson's Avatar
    Rick Johnson Guest

    Default Zwicky's Connected Multiple System -- Arp 73

    Make that Arp 103.

    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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