ASTRO: Another Arp 2 fer: 296 and 299

Two smashups -- 5 galaxies -- What a mess that makes. While several
pairs of Arp Atlas entries are close to each other in angular
measurement these two are the closest. Though they are far apart in
reality.

To me this is a case of string cheese and a massive train wreck all in
one image. Arp created a lot of confusion on this pair of entries when
in some places he reversed them. There's also confusion on which galaxy
is IC 694. More on that later.

Arp 296 is the string cheese part of the entry. It is a pair of
galaxies apparently nearly connected by a long filament that appears to
be drawn out from the lower galaxy. There's a counter filament going
the other direction as well that is much shorter. The lower galaxy is
SDSS J112850.64+583336.7, two minutes north is PGC 035345. NED classes
the lower as S: pec and the northern as SB(r)ab and notes a lot of HII
emission not seen in my image. Both are about 800 million light years
away. Are they really an interacting pair? Odd how one has severe
tidal tails while the other is rather normal looking though its eastern
arm suddenly becomes very faint and somewhat drawn out. Though I'd
think we'd see more distortion than this from an interaction. Or is the
arm weak because its stars contribute to the plume apparently coming
from the lower galaxy? I didn't find any help in the literature. My
search wasn't all that great however so if someone out there knows of
some help here let us know. Arp's comment on the pair reads: "Long
straight filament almost to attachment with arm of spiral." By spiral I
assume he means PGC 035345 as NED shows both as spirals.

Much nearer at only about 150 million light years, Arp 299 is a quite
spectacular train wreck in progress. I didn't realize all the outlying
plumes around it or I'd have use a lot more time on this image. Maybe
later this year I'll get a chance to try and add time to it. I did take
a lot more data but half of it was so poor I threw it out. The double
data was an accident, I didn't realize the two Arp's were in the same
field and imaged it twice, once on a very poor night. But you can
barely see a north going plume that is rather narrow and eventually
curves a bit left. Another, fainter one is seen to its west Below
there's a bright wide and short plume due south with a far fainter and
far larger plume to the southwest.

The identity of the two galaxies is very confused. Some sources say NGC
3690 is the eastern galaxy with IC 694 being the western. In fact most
of the literature I saw says this but newer literature identifies IC 694
as the small galaxy to the northwest but still in the plume of the
colliding pair. I'm going with this interpretation and have so marked
the annotated image. For more on this see
http://iopscience.iop.org/1538-3881/...990040.web.pdf (PDF
pages 22-23, Journal pages 183-184). Note that their discussion of the
plumes matches my image as to the northern plumes (fainter one west of
the main one is also visible in my image) but I see a much larger plume
to the southwest than they show. More data will likely settle the issue.

Is IC 694 involved with Arp 299? Arp seems to have included it. NED
does class it as a starburst galaxy with an active galactic nucleus, no
other classification given. It's red shift distance is nearly 190
million light years. If right that puts it about 40 million light years
beyond the train wreck. While it is remotely possible this difference
is entirely due to relative motion I find that a bit difficult to
accept. It may have past nearby a billion years ago at a distance great
enough to not distort it but close enough to trigger the starburst and
feed its black hole. A process that could be continuing today. But I
doubt it had anything to do with the train wreck that is Arp 299.

Of the colliding pair the western one is classed as SBm? pec by NED with
the eastern one classed as IBm pec. How they detect a bar in either is
beyond me. They both appear to be a bunch of bright star regions
scattered about with what is left of the cores well off center.

The confusion continues with a pair of galaxies in the south east corner
of the image. I note in the annotated image the southern one (rather
blue) as being 0.59 billion light years distant. NED is very confusing
about this pair. In the position of the northern galaxy they show 2MASX
J11300711+5826154 with no distance. The blue galaxy is 13" of arc south
south east of this galaxy. At about the position of the southern galaxy
NED shows two galaxies as VII Zw 405 NOTES01 and VII Zw 405 NOTES02 with
a separation of 3". While my seeing wasn't all that good I thought I
should be able to see that lower blue one as a close double. Looking at
the notes at NED several different sources say VII Zw 405 is a double
galaxy with the northern one being red and the southern blue with a
separation of -- 13" of arc. Their own notes would seem to say the
southern blue object is just one galaxy. The position NED gives for VII
Zw 405 matches the blue galaxy's position. Only the southern member has
a red shift measurement. So who is right here I have no idea.

Low center there's a nice tight group of galaxies with the same red
shift distance of 0.56 - 0.57 billion light years that are blue. One
apparent member is somewhat redder but has no red shift data. I marked
it with a question mark.

Hubble image of Arp 299 (its a tad better than mine):
http://www.spacetelescope.org/static...heic0810as.jpg

Arp's image of Arp 296
http://nedwww.ipac.caltech.edu/level...ig_arp296.jpeg

Arp's image of Arp 299
http://nedwww.ipac.caltech.edu/level...ig_arp299.jpeg

14" LX200R, 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".

Rick,

you got amazing detail in this image. Seeing must have been good.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
ster.com...
Two smashups -- 5 galaxies -- What a mess that makes. While several
pairs of Arp Atlas entries are close to each other in angular
measurement these two are the closest. Though they are far apart in
reality.

To me this is a case of string cheese and a massive train wreck all in
one image. Arp created a lot of confusion on this pair of entries when
in some places he reversed them. There's also confusion on which galaxy
is IC 694. More on that later.

Arp 296 is the string cheese part of the entry. It is a pair of
galaxies apparently nearly connected by a long filament that appears to
be drawn out from the lower galaxy. There's a counter filament going
the other direction as well that is much shorter. The lower galaxy is
SDSS J112850.64+583336.7, two minutes north is PGC 035345. NED classes
the lower as S: pec and the northern as SB(r)ab and notes a lot of HII
emission not seen in my image. Both are about 800 million light years
away. Are they really an interacting pair? Odd how one has severe
tidal tails while the other is rather normal looking though its eastern
arm suddenly becomes very faint and somewhat drawn out. Though I'd
think we'd see more distortion than this from an interaction. Or is the
arm weak because its stars contribute to the plume apparently coming
from the lower galaxy? I didn't find any help in the literature. My
search wasn't all that great however so if someone out there knows of
some help here let us know. Arp's comment on the pair reads: "Long
straight filament almost to attachment with arm of spiral." By spiral I
assume he means PGC 035345 as NED shows both as spirals.

Much nearer at only about 150 million light years, Arp 299 is a quite
spectacular train wreck in progress. I didn't realize all the outlying
plumes around it or I'd have use a lot more time on this image. Maybe
later this year I'll get a chance to try and add time to it. I did take
a lot more data but half of it was so poor I threw it out. The double
data was an accident, I didn't realize the two Arp's were in the same
field and imaged it twice, once on a very poor night. But you can
barely see a north going plume that is rather narrow and eventually
curves a bit left. Another, fainter one is seen to its west Below
there's a bright wide and short plume due south with a far fainter and
far larger plume to the southwest.

The identity of the two galaxies is very confused. Some sources say NGC
3690 is the eastern galaxy with IC 694 being the western. In fact most
of the literature I saw says this but newer literature identifies IC 694
as the small galaxy to the northwest but still in the plume of the
colliding pair. I'm going with this interpretation and have so marked
the annotated image. For more on this see
http://iopscience.iop.org/1538-3881/...990040.web.pdf (PDF
pages 22-23, Journal pages 183-184). Note that their discussion of the
plumes matches my image as to the northern plumes (fainter one west of
the main one is also visible in my image) but I see a much larger plume
to the southwest than they show. More data will likely settle the issue.

Is IC 694 involved with Arp 299? Arp seems to have included it. NED
does class it as a starburst galaxy with an active galactic nucleus, no
other classification given. It's red shift distance is nearly 190
million light years. If right that puts it about 40 million light years
beyond the train wreck. While it is remotely possible this difference
is entirely due to relative motion I find that a bit difficult to
accept. It may have past nearby a billion years ago at a distance great
enough to not distort it but close enough to trigger the starburst and
feed its black hole. A process that could be continuing today. But I
doubt it had anything to do with the train wreck that is Arp 299.

Of the colliding pair the western one is classed as SBm? pec by NED with
the eastern one classed as IBm pec. How they detect a bar in either is
beyond me. They both appear to be a bunch of bright star regions
scattered about with what is left of the cores well off center.

The confusion continues with a pair of galaxies in the south east corner
of the image. I note in the annotated image the southern one (rather
blue) as being 0.59 billion light years distant. NED is very confusing
about this pair. In the position of the northern galaxy they show 2MASX
J11300711+5826154 with no distance. The blue galaxy is 13" of arc south
south east of this galaxy. At about the position of the southern galaxy
NED shows two galaxies as VII Zw 405 NOTES01 and VII Zw 405 NOTES02 with
a separation of 3". While my seeing wasn't all that good I thought I
should be able to see that lower blue one as a close double. Looking at
the notes at NED several different sources say VII Zw 405 is a double
galaxy with the northern one being red and the southern blue with a
separation of -- 13" of arc. Their own notes would seem to say the
southern blue object is just one galaxy. The position NED gives for VII
Zw 405 matches the blue galaxy's position. Only the southern member has
a red shift measurement. So who is right here I have no idea.

Low center there's a nice tight group of galaxies with the same red
shift distance of 0.56 - 0.57 billion light years that are blue. One
apparent member is somewhat redder but has no red shift data. I marked
it with a question mark.

Hubble image of Arp 299 (its a tad better than mine):
http://www.spacetelescope.org/static...heic0810as.jpg

Arp's image of Arp 296
http://nedwww.ipac.caltech.edu/level...ig_arp296.jpeg

Arp's image of Arp 299
http://nedwww.ipac.caltech.edu/level...ig_arp299.jpeg

14" LX200R, 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".

When I checked this lot before buying it had excellent seeing but that
went to pot after building. Last winter it went back close to what I'd
seen earlier. They are still rare, this one far better than before but
not up to what I was seeing. The night I took C179 my seeing was just
over 1" FWHM for one image and no worse than 1.5" for the rest. This
image a bit over 2". Still a lot better than the 3.5" I averaged the
first few years. I didn't change anything, just the atmosphere
conditions changed. Far less jet stream and fewer fronts going through.

Rick

On 11/4/2010 7:05 PM, Stefan Lilge wrote:
Rick,

you got amazing detail in this image. Seeing must have been good.

Stefan

"Rick schrieb im Newsbeitrag
ster.com...
Two smashups -- 5 galaxies -- What a mess that makes. While several
pairs of Arp Atlas entries are close to each other in angular
measurement these two are the closest. Though they are far apart in
reality.

To me this is a case of string cheese and a massive train wreck all in
one image. Arp created a lot of confusion on this pair of entries when
in some places he reversed them. There's also confusion on which galaxy
is IC 694. More on that later.

Arp 296 is the string cheese part of the entry. It is a pair of
galaxies apparently nearly connected by a long filament that appears to
be drawn out from the lower galaxy. There's a counter filament going
the other direction as well that is much shorter. The lower galaxy is
SDSS J112850.64+583336.7, two minutes north is PGC 035345. NED classes
the lower as S: pec and the northern as SB(r)ab and notes a lot of HII
emission not seen in my image. Both are about 800 million light years
away. Are they really an interacting pair? Odd how one has severe
tidal tails while the other is rather normal looking though its eastern
arm suddenly becomes very faint and somewhat drawn out. Though I'd
think we'd see more distortion than this from an interaction. Or is the
arm weak because its stars contribute to the plume apparently coming
from the lower galaxy? I didn't find any help in the literature. My
search wasn't all that great however so if someone out there knows of
some help here let us know. Arp's comment on the pair reads: "Long
straight filament almost to attachment with arm of spiral." By spiral I
assume he means PGC 035345 as NED shows both as spirals.

Much nearer at only about 150 million light years, Arp 299 is a quite
spectacular train wreck in progress. I didn't realize all the outlying
plumes around it or I'd have use a lot more time on this image. Maybe
later this year I'll get a chance to try and add time to it. I did take
a lot more data but half of it was so poor I threw it out. The double
data was an accident, I didn't realize the two Arp's were in the same
field and imaged it twice, once on a very poor night. But you can
barely see a north going plume that is rather narrow and eventually
curves a bit left. Another, fainter one is seen to its west Below
there's a bright wide and short plume due south with a far fainter and
far larger plume to the southwest.

The identity of the two galaxies is very confused. Some sources say NGC
3690 is the eastern galaxy with IC 694 being the western. In fact most
of the literature I saw says this but newer literature identifies IC 694
as the small galaxy to the northwest but still in the plume of the
colliding pair. I'm going with this interpretation and have so marked
the annotated image. For more on this see
http://iopscience.iop.org/1538-3881/...990040.web.pdf (PDF
pages 22-23, Journal pages 183-184). Note that their discussion of the
plumes matches my image as to the northern plumes (fainter one west of
the main one is also visible in my image) but I see a much larger plume
to the southwest than they show. More data will likely settle the issue.

Is IC 694 involved with Arp 299? Arp seems to have included it. NED
does class it as a starburst galaxy with an active galactic nucleus, no
other classification given. It's red shift distance is nearly 190
million light years. If right that puts it about 40 million light years
beyond the train wreck. While it is remotely possible this difference
is entirely due to relative motion I find that a bit difficult to
accept. It may have past nearby a billion years ago at a distance great
enough to not distort it but close enough to trigger the starburst and
feed its black hole. A process that could be continuing today. But I
doubt it had anything to do with the train wreck that is Arp 299.

Of the colliding pair the western one is classed as SBm? pec by NED with
the eastern one classed as IBm pec. How they detect a bar in either is
beyond me. They both appear to be a bunch of bright star regions
scattered about with what is left of the cores well off center.

The confusion continues with a pair of galaxies in the south east corner
of the image. I note in the annotated image the southern one (rather
blue) as being 0.59 billion light years distant. NED is very confusing
about this pair. In the position of the northern galaxy they show 2MASX
J11300711+5826154 with no distance. The blue galaxy is 13" of arc south
south east of this galaxy. At about the position of the southern galaxy
NED shows two galaxies as VII Zw 405 NOTES01 and VII Zw 405 NOTES02 with
a separation of 3". While my seeing wasn't all that good I thought I
should be able to see that lower blue one as a close double. Looking at
the notes at NED several different sources say VII Zw 405 is a double
galaxy with the northern one being red and the southern blue with a
separation of -- 13" of arc. Their own notes would seem to say the
southern blue object is just one galaxy. The position NED gives for VII
Zw 405 matches the blue galaxy's position. Only the southern member has
a red shift measurement. So who is right here I have no idea.

Low center there's a nice tight group of galaxies with the same red
shift distance of 0.56 - 0.57 billion light years that are blue. One
apparent member is somewhat redder but has no red shift data. I marked
it with a question mark.

Hubble image of Arp 299 (its a tad better than mine):
http://www.spacetelescope.org/static...heic0810as.jpg

Arp's image of Arp 296
http://nedwww.ipac.caltech.edu/level...ig_arp296.jpeg

Arp's image of Arp 299
http://nedwww.ipac.caltech.edu/level...ig_arp299.jpeg

14" LX200R, 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".





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

A great image. did not have this group on my target list.

On Wed, 03 Nov 2010 23:57:48 -0500, Rick Johnson
wrote:

Two smashups -- 5 galaxies -- What a mess that makes. While several
pairs of Arp Atlas entries are close to each other in angular
measurement these two are the closest. Though they are far apart in
reality.

To me this is a case of string cheese and a massive train wreck all in
one image. Arp created a lot of confusion on this pair of entries when
in some places he reversed them. There's also confusion on which galaxy
is IC 694. More on that later.

Arp 296 is the string cheese part of the entry. It is a pair of
galaxies apparently nearly connected by a long filament that appears to
be drawn out from the lower galaxy. There's a counter filament going
the other direction as well that is much shorter. The lower galaxy is
SDSS J112850.64+583336.7, two minutes north is PGC 035345. NED classes
the lower as S: pec and the northern as SB(r)ab and notes a lot of HII
emission not seen in my image. Both are about 800 million light years
away. Are they really an interacting pair? Odd how one has severe
tidal tails while the other is rather normal looking though its eastern
arm suddenly becomes very faint and somewhat drawn out. Though I'd
think we'd see more distortion than this from an interaction. Or is the
arm weak because its stars contribute to the plume apparently coming
from the lower galaxy? I didn't find any help in the literature. My
search wasn't all that great however so if someone out there knows of
some help here let us know. Arp's comment on the pair reads: "Long
straight filament almost to attachment with arm of spiral." By spiral I
assume he means PGC 035345 as NED shows both as spirals.

Much nearer at only about 150 million light years, Arp 299 is a quite
spectacular train wreck in progress. I didn't realize all the outlying
plumes around it or I'd have use a lot more time on this image. Maybe
later this year I'll get a chance to try and add time to it. I did take
a lot more data but half of it was so poor I threw it out. The double
data was an accident, I didn't realize the two Arp's were in the same
field and imaged it twice, once on a very poor night. But you can
barely see a north going plume that is rather narrow and eventually
curves a bit left. Another, fainter one is seen to its west Below
there's a bright wide and short plume due south with a far fainter and
far larger plume to the southwest.

The identity of the two galaxies is very confused. Some sources say NGC
3690 is the eastern galaxy with IC 694 being the western. In fact most
of the literature I saw says this but newer literature identifies IC 694
as the small galaxy to the northwest but still in the plume of the
colliding pair. I'm going with this interpretation and have so marked
the annotated image. For more on this see
http://iopscience.iop.org/1538-3881/...990040.web.pdf (PDF
pages 22-23, Journal pages 183-184). Note that their discussion of the
plumes matches my image as to the northern plumes (fainter one west of
the main one is also visible in my image) but I see a much larger plume
to the southwest than they show. More data will likely settle the issue.

Is IC 694 involved with Arp 299? Arp seems to have included it. NED
does class it as a starburst galaxy with an active galactic nucleus, no
other classification given. It's red shift distance is nearly 190
million light years. If right that puts it about 40 million light years
beyond the train wreck. While it is remotely possible this difference
is entirely due to relative motion I find that a bit difficult to
accept. It may have past nearby a billion years ago at a distance great
enough to not distort it but close enough to trigger the starburst and
feed its black hole. A process that could be continuing today. But I
doubt it had anything to do with the train wreck that is Arp 299.

Of the colliding pair the western one is classed as SBm? pec by NED with
the eastern one classed as IBm pec. How they detect a bar in either is
beyond me. They both appear to be a bunch of bright star regions
scattered about with what is left of the cores well off center.

The confusion continues with a pair of galaxies in the south east corner
of the image. I note in the annotated image the southern one (rather
blue) as being 0.59 billion light years distant. NED is very confusing
about this pair. In the position of the northern galaxy they show 2MASX
J11300711+5826154 with no distance. The blue galaxy is 13" of arc south
south east of this galaxy. At about the position of the southern galaxy
NED shows two galaxies as VII Zw 405 NOTES01 and VII Zw 405 NOTES02 with
a separation of 3". While my seeing wasn't all that good I thought I
should be able to see that lower blue one as a close double. Looking at
the notes at NED several different sources say VII Zw 405 is a double
galaxy with the northern one being red and the southern blue with a
separation of -- 13" of arc. Their own notes would seem to say the
southern blue object is just one galaxy. The position NED gives for VII
Zw 405 matches the blue galaxy's position. Only the southern member has
a red shift measurement. So who is right here I have no idea.

Low center there's a nice tight group of galaxies with the same red
shift distance of 0.56 - 0.57 billion light years that are blue. One
apparent member is somewhat redder but has no red shift data. I marked
it with a question mark.

Hubble image of Arp 299 (its a tad better than mine):
http://www.spacetelescope.org/static...heic0810as.jpg

Arp's image of Arp 296
http://nedwww.ipac.caltech.edu/level...ig_arp296.jpeg

Arp's image of Arp 299
http://nedwww.ipac.caltech.edu/level...ig_arp299.jpeg

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

Rick