Astro: Arp 2 fer #8 and #67

Arp 2 fer located in north central Cetus.
Arp 8
Arp 8/NGC 497, in the lower left corner in my image, is a spiral Arp put
in his "split arm" category. It is a bit over 350 million light-years
distant. His comment reads: "Bifurcated arm does not start at end of
bar." That would indicate he is talking about the southeastern arm that
sticks out. It is a long spur of a rather normal arm. A note at NED
reads: "Peculiar broken arm on north-preceding side." This seems to
refer to the odd star clouds arranged in a rather straight line on the
other side of the galaxy. The middle one is listed in some catalogs as
a separate galaxy (see annotated image). NED however says it is part of
NGC 497. One source even lists it as a quasar candidate which I find
really strange.

Arp 67
Arp 67/UGC 892 is located along the top right edge of the image. It is
in his category for Spirals with high surface brightness companions on
their arms. As I've mentioned before the majority of the galaxies he
considered spirals made the atlas for companions of some sort on their
arms. In most cases it was unknown if the two were related. Apparently
that didn't matter. The result is that some turned out to be related,
some unrelated and some are still unknown like Arp 88 posted mid
September. In this case there are two possible companions. Which was
the companion Arp refers to? Apparently both as his comment reads:
"Comps. lie on inner and outer spiral arms." Redshift puts Arp 67 at
about 225 million light-years. The inner arm spiral has a red shift
that puts it about 3 times further at 720 million light years. The one
he refers to be on the outer arm has no redshift data but appears to be
an unrelated background galaxy as well. Arp 67 is odd in that the
"inner arm" seems to be a very odd spur. The main arms form an oval
ring. At the northeastern end of the bar an odd linear arm goes across
the ring then curves around toward the distant reddish companion. The
other lies more on the outer edge of the galaxy's disk rather than an
arm. This arm as well as the faint arms or plumes going out of my image
at the top my be the result of a merger with a small galaxy. This seems
more reasonable than two apparently unrelated galaxies being the cause.
The inner arm galaxy is SDSS J012117.42-003311.7. For some reason the
outer arm galaxy never made it into any catalog at NED but the United
Kingdom automatic plate survey. How everyone else missed it I can't
fathom. It is listed in that catalog as APMUKS(BJ) B011845.66-004851.5.
In both cases the name is just the J2000 position.

There are several galaxy clusters in the image. One at about 710
million light-years that covers a major portion of my image. Another is
mostly in the northwestern quadrant at 1.2 million light-years. Another
is centered on an orange galaxy in the southeaster corner at a bit over
2 million light years. The anchor elliptical galaxy is located at the
same position as the cluster though the two have two different listed
redshifts.

More interesting are the large number of quasars and Ultraviolet Excess
Sources which are likely quasars as well. Some are listed both ways,
often in the Sloan survey listing. Several are over 10 billion
light-years distance. One is listed as a quasar and galaxy and is only
2.5 billion light-years away. Some pure galaxies are more distant. The
most distant galaxy is nearly 5 billion light years distant. It is
above center near the right edge.

4 bright asteroids are also in the image and noted on the annotated
image. All are bright enough to have left colored trails as often seen
in my image. So why aren't any seen? Seems this image is the product
of three nights. The luminance was taken the first night. Clouds moved
in ending imaging. Over two later nights I collected the color data,
fighting clouds all the way. But by then the asteroids had moved on.
New asteroids had moved into the field and sometimes did leave color
trails but without a luminance trail I played God and edited them out.
After 3 nights I still only had 2 red frames with the third unusable.
But then the moon was in the way. I never did get a third red but one
each of the green and blue was poor. With the ending signal to noise
ratio about the same in all three colors I quit trying for a third red
figuring it would unbalance things even more.

Arp's image of Arp 8
http://ned.ipac.caltech.edu/level5/A.../big_arp8.jpeg

Arp's image of Arp 67
http://ned.ipac.caltech.edu/level5/A...big_arp67.jpeg

14" LX200R @ f/10, L=4x10' R=2x10'x3 GB=3x10x3, 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".

Rick,

these are two fine spirals.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
.com...
Arp 2 fer located in north central Cetus.
Arp 8
Arp 8/NGC 497, in the lower left corner in my image, is a spiral Arp put
in his "split arm" category. It is a bit over 350 million light-years
distant. His comment reads: "Bifurcated arm does not start at end of
bar." That would indicate he is talking about the southeastern arm that
sticks out. It is a long spur of a rather normal arm. A note at NED
reads: "Peculiar broken arm on north-preceding side." This seems to
refer to the odd star clouds arranged in a rather straight line on the
other side of the galaxy. The middle one is listed in some catalogs as
a separate galaxy (see annotated image). NED however says it is part of
NGC 497. One source even lists it as a quasar candidate which I find
really strange.

Arp 67
Arp 67/UGC 892 is located along the top right edge of the image. It is
in his category for Spirals with high surface brightness companions on
their arms. As I've mentioned before the majority of the galaxies he
considered spirals made the atlas for companions of some sort on their
arms. In most cases it was unknown if the two were related. Apparently
that didn't matter. The result is that some turned out to be related,
some unrelated and some are still unknown like Arp 88 posted mid
September. In this case there are two possible companions. Which was
the companion Arp refers to? Apparently both as his comment reads:
"Comps. lie on inner and outer spiral arms." Redshift puts Arp 67 at
about 225 million light-years. The inner arm spiral has a red shift
that puts it about 3 times further at 720 million light years. The one
he refers to be on the outer arm has no redshift data but appears to be
an unrelated background galaxy as well. Arp 67 is odd in that the
"inner arm" seems to be a very odd spur. The main arms form an oval
ring. At the northeastern end of the bar an odd linear arm goes across
the ring then curves around toward the distant reddish companion. The
other lies more on the outer edge of the galaxy's disk rather than an
arm. This arm as well as the faint arms or plumes going out of my image
at the top my be the result of a merger with a small galaxy. This seems
more reasonable than two apparently unrelated galaxies being the cause.
The inner arm galaxy is SDSS J012117.42-003311.7. For some reason the
outer arm galaxy never made it into any catalog at NED but the United
Kingdom automatic plate survey. How everyone else missed it I can't
fathom. It is listed in that catalog as APMUKS(BJ) B011845.66-004851.5.
In both cases the name is just the J2000 position.

There are several galaxy clusters in the image. One at about 710
million light-years that covers a major portion of my image. Another is
mostly in the northwestern quadrant at 1.2 million light-years. Another
is centered on an orange galaxy in the southeaster corner at a bit over
2 million light years. The anchor elliptical galaxy is located at the
same position as the cluster though the two have two different listed
redshifts.

More interesting are the large number of quasars and Ultraviolet Excess
Sources which are likely quasars as well. Some are listed both ways,
often in the Sloan survey listing. Several are over 10 billion
light-years distance. One is listed as a quasar and galaxy and is only
2.5 billion light-years away. Some pure galaxies are more distant. The
most distant galaxy is nearly 5 billion light years distant. It is
above center near the right edge.

4 bright asteroids are also in the image and noted on the annotated
image. All are bright enough to have left colored trails as often seen
in my image. So why aren't any seen? Seems this image is the product
of three nights. The luminance was taken the first night. Clouds moved
in ending imaging. Over two later nights I collected the color data,
fighting clouds all the way. But by then the asteroids had moved on.
New asteroids had moved into the field and sometimes did leave color
trails but without a luminance trail I played God and edited them out.
After 3 nights I still only had 2 red frames with the third unusable.
But then the moon was in the way. I never did get a third red but one
each of the green and blue was poor. With the ending signal to noise
ratio about the same in all three colors I quit trying for a third red
figuring it would unbalance things even more.

Arp's image of Arp 8
http://ned.ipac.caltech.edu/level5/A.../big_arp8.jpeg

Arp's image of Arp 67
http://ned.ipac.caltech.edu/level5/A...big_arp67.jpeg

14" LX200R @ f/10, L=4x10' R=2x10'x3 GB=3x10x3, 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".