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ASTRO: Arp 133 with Minkowski's Object and Arp 308



 
 
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  #1  
Old November 29th 11, 07:56 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Arp 133 with Minkowski's Object and Arp 308

Another Arp pair. These are located in the Abell 194 galaxy cluster.
The cluster is located in north central Cetus about 230 million
light-years away.

Arp 133 falls under Arp's very odd category of galaxies with nearby
fragments. It consists of two galaxies, NGC 541 the large cD/S0 galaxy
to the southwest of a pair of elliptical galaxies that are Arp 308. The
fragment is the very blue dwarf galaxy to its northeast (upper right).
This is not a fragment at all but a dwarf galaxy undergoing extreme
starburst star formation. It is known as Minkowski's Object. NGC 541
is a radio galaxy with jets. One is directed directly at Minkowski's
Object and is credited with triggering the starburst activity.
Minkowski's Object has a different redshift but this is more an
indication of relative velocity than a real distance difference. Arp
133 with its blue companion galaxy is almost identical in appearance to
the much nearer Arp 134 (M49 and its blue "fragment" UGC 07636.)
http://www.spacebanter.com/attachmen...tid=2440&stc=1

Arp had no knowledge of this at the time of his image. His image
carries a note that it was taken with a "Poloroid" filter. I assume he
means polarizing filter. How it was aligned it doesn't say. Arp's
comment on the image reads: "Central member of galaxy group associated
with 3C40." 3C40 is a strong radio source. This is not the radio
source involved with the starburst activity in Minkowski's Object. But
it does bring us to Arp 308.

Arp 308 is a pair of galaxies; NGC 545 and NGC 547 that is associated
with the radio source 3C40. That is NGC 547 is considered to be the
source of 3C40. Arp put the pair in his category of simply double
galaxies. His simple remark says: "Close ellipticals." which isn't very
informative. NGC 545 to the north is listed as an SA0 galaxy while NGC
547 is E1 and a bright cluster galaxy. Redshift puts it at 6 million
light-years further from us that NGC 545. However NED gives a D-Sigma
distance determination that is the same for both. Likely the difference
in radial velocity is due to relative motion rather than distance. The
exact same D-Sigma distance is found for NGC 541 (Arp 133) as well. A
1964 paper concludes NGC 545 is not interacting with NGC 547. I find
that hard to accept.

Notes about the annotated image.
Objects considered part of Abell 194 are listed by name.

Redshift distance using NED's 5 year WMAP assumptions are used. They
are expressed in billions of light-years. Differences in cluster member
radial velocity is most likely due to relative velocity around the
clusters center of mass rather than a true distance indicator. Most,
likely lie within a few million light-years of each other. The label is
immediately right of the object when possible. Otherwise a line will
connect the object and its label.

XMMU J012535.9-012546 is an X-ray galaxy. It appears to be a very
compact dwarf of some sort.

ARK 45: A note at NED says "Together with NGC 0547 this is the radio
source 3C 40." I'm not sure how this was determined, especially since
NGC 545 is in the middle yet not considered part of 3C 40 that I found.
Also note its redshift is surprisingly different.
+
NSCS J012537-011739 is a galaxy cluster at 4.97 billion light-years. It
contains 36 members. The diameter isn't specified. I see a dozen or
two within a few minutes of the center. Many look like faint stars.

WHL J012538.1-011301 is another galaxy cluster at 5.3 billion
light-years. It contains only 8 members. It's center is a couple
seconds of arc from a faint galaxy, probably the anchoring member. The
NED position is only approximate so likely means to point to this galaxy.

The UvES (Ultraviolet Excess Source) is likely a quasar given its distance.

Arp's image of these galaxies is made from the same plate and cropped to
exclude the other atlas entry. Most of his images are are shorter than
the one hour exposure on 103a-0 image. The added time is likely due to
losses in the "Poloroid" filter. He lists the seeing as average 1" to 1.5".

Arp's image of Arp 133 with an asteroid trail:
http://ned.ipac.caltech.edu/level5/A...ig_arp133.jpeg

Arp's image of Arp 308
http://ned.ipac.caltech.edu/level5/A...ig_arp308.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 3rd 11, 01:05 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default ASTRO: Arp 133 with Minkowski's Object and Arp 308

Rick,

the Minkowski object gives a striking colour contrast to the S0 galaxies.
Great image.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
.com...
Another Arp pair. These are located in the Abell 194 galaxy cluster.
The cluster is located in north central Cetus about 230 million
light-years away.

Arp 133 falls under Arp's very odd category of galaxies with nearby
fragments. It consists of two galaxies, NGC 541 the large cD/S0 galaxy
to the southwest of a pair of elliptical galaxies that are Arp 308. The
fragment is the very blue dwarf galaxy to its northeast (upper right).
This is not a fragment at all but a dwarf galaxy undergoing extreme
starburst star formation. It is known as Minkowski's Object. NGC 541
is a radio galaxy with jets. One is directed directly at Minkowski's
Object and is credited with triggering the starburst activity.
Minkowski's Object has a different redshift but this is more an
indication of relative velocity than a real distance difference. Arp
133 with its blue companion galaxy is almost identical in appearance to
the much nearer Arp 134 (M49 and its blue "fragment" UGC 07636.)
http://www.spacebanter.com/attachmen...tid=2440&stc=1

Arp had no knowledge of this at the time of his image. His image
carries a note that it was taken with a "Poloroid" filter. I assume he
means polarizing filter. How it was aligned it doesn't say. Arp's
comment on the image reads: "Central member of galaxy group associated
with 3C40." 3C40 is a strong radio source. This is not the radio
source involved with the starburst activity in Minkowski's Object. But
it does bring us to Arp 308.

Arp 308 is a pair of galaxies; NGC 545 and NGC 547 that is associated
with the radio source 3C40. That is NGC 547 is considered to be the
source of 3C40. Arp put the pair in his category of simply double
galaxies. His simple remark says: "Close ellipticals." which isn't very
informative. NGC 545 to the north is listed as an SA0 galaxy while NGC
547 is E1 and a bright cluster galaxy. Redshift puts it at 6 million
light-years further from us that NGC 545. However NED gives a D-Sigma
distance determination that is the same for both. Likely the difference
in radial velocity is due to relative motion rather than distance. The
exact same D-Sigma distance is found for NGC 541 (Arp 133) as well. A
1964 paper concludes NGC 545 is not interacting with NGC 547. I find
that hard to accept.

Notes about the annotated image.
Objects considered part of Abell 194 are listed by name.

Redshift distance using NED's 5 year WMAP assumptions are used. They
are expressed in billions of light-years. Differences in cluster member
radial velocity is most likely due to relative velocity around the
clusters center of mass rather than a true distance indicator. Most,
likely lie within a few million light-years of each other. The label is
immediately right of the object when possible. Otherwise a line will
connect the object and its label.

XMMU J012535.9-012546 is an X-ray galaxy. It appears to be a very
compact dwarf of some sort.

ARK 45: A note at NED says "Together with NGC 0547 this is the radio
source 3C 40." I'm not sure how this was determined, especially since
NGC 545 is in the middle yet not considered part of 3C 40 that I found.
Also note its redshift is surprisingly different.
+
NSCS J012537-011739 is a galaxy cluster at 4.97 billion light-years. It
contains 36 members. The diameter isn't specified. I see a dozen or
two within a few minutes of the center. Many look like faint stars.

WHL J012538.1-011301 is another galaxy cluster at 5.3 billion
light-years. It contains only 8 members. It's center is a couple
seconds of arc from a faint galaxy, probably the anchoring member. The
NED position is only approximate so likely means to point to this galaxy.

The UvES (Ultraviolet Excess Source) is likely a quasar given its
distance.

Arp's image of these galaxies is made from the same plate and cropped to
exclude the other atlas entry. Most of his images are are shorter than
the one hour exposure on 103a-0 image. The added time is likely due to
losses in the "Poloroid" filter. He lists the seeing as average 1" to
1.5".

Arp's image of Arp 133 with an asteroid trail:
http://ned.ipac.caltech.edu/level5/A...ig_arp133.jpeg

Arp's image of Arp 308
http://ned.ipac.caltech.edu/level5/A...ig_arp308.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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