Astro: Who cut this galaxy in half? Arp 293

Arp 293 is a pair of interacting galaxies, NGC 6285 (right) and NGC 6286
in the constellation of Draco. A tidal bridge between the two is barely
visible in my image. The northern galaxy is classed as S0 pec. There
seems too much fragmentation and tidal plumes for me to tell what it was
before the interaction. The southern galaxy is considered an edge on Sb
spiral. Both appear to be LINER galaxies. Red shift puts them about
250 million light-years distant. Some sources say NGC 6286 (southern
galaxy) is a forming polar ring galaxy. Certainly it has an odd half
ring tidal feature that is well out of its plane of rotation. Also its
eastern arm appears nearly severed from the core with an brightening at
the very end of this lopped off arm. This may be a foreshortened bright
arm arc. Arp classed it under Group Character: Wind effects. His
comment about it was: "Diffuse arc south-following brighter galaxy."
Apparently referring to the same feature some see as the start of a
polar ring feature. This may also be the "wind effect" he refers to.

Some catalogs consider it a triple galaxy including the very edge on UGC
10641, an Sd galaxy to the southwest. It is about 240 million
light-years distant per its red shift. I see no hint of interaction
with the other two however. At a red shift that puts it 235 million
light-years away is the elliptical galaxy UGC 10646 at the very top of
my image. Keep in mind that orbital motions within a group of galaxies
can create a range of red shifts such as we see here such that the real
distance to each is not really shown by the red shift. Thus, these
galaxies are all likely at virtually the same distance and form a rather
nice "local group" of their own. Only two of which are so close they
are interacting.

In the southwest corner (lower right) are a bunch of faint galaxies,
many of which seem to align in concentric arcs around a rather bright
orange galaxy. I find no red shift data on any of these but they are in
the position of a galaxy cluster candidate known as NSC J165634+585212.
It has a photographic red shift distance (likely based on 2MASS K band
data) of 1.8 billion light-years. NED lists no size or population for it.

The barred spiral on the very eastern edge of my image is SBS 1659+589.
NED has no red shift data on it but I'd expect it likely a member of
the same group as Arp 293. Just beyond it out of my frame are NGC 6290
and NGC 6291 with a red shift that puts them at 235 million light-years
and again, members of same group as Arp 293.

All my cloudy weather has allowed me to slowly catch up on my
processing. This marks my last May image. Next up June!

Arp's image
http://nedwww.ipac.caltech.edu/level...ig_arp293.jpeg

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

I've also attached a 1.5x cropped enlargement to better show some
details of the system.

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".

Great picture Rick. I don't remember another galaxy that has such a
prominent tilted dark lane.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
. com...
Arp 293 is a pair of interacting galaxies, NGC 6285 (right) and NGC 6286
in the constellation of Draco. A tidal bridge between the two is barely
visible in my image. The northern galaxy is classed as S0 pec. There
seems too much fragmentation and tidal plumes for me to tell what it was
before the interaction. The southern galaxy is considered an edge on Sb
spiral. Both appear to be LINER galaxies. Red shift puts them about
250 million light-years distant. Some sources say NGC 6286 (southern
galaxy) is a forming polar ring galaxy. Certainly it has an odd half
ring tidal feature that is well out of its plane of rotation. Also its
eastern arm appears nearly severed from the core with an brightening at
the very end of this lopped off arm. This may be a foreshortened bright
arm arc. Arp classed it under Group Character: Wind effects. His
comment about it was: "Diffuse arc south-following brighter galaxy."
Apparently referring to the same feature some see as the start of a
polar ring feature. This may also be the "wind effect" he refers to.

Some catalogs consider it a triple galaxy including the very edge on UGC
10641, an Sd galaxy to the southwest. It is about 240 million
light-years distant per its red shift. I see no hint of interaction
with the other two however. At a red shift that puts it 235 million
light-years away is the elliptical galaxy UGC 10646 at the very top of
my image. Keep in mind that orbital motions within a group of galaxies
can create a range of red shifts such as we see here such that the real
distance to each is not really shown by the red shift. Thus, these
galaxies are all likely at virtually the same distance and form a rather
nice "local group" of their own. Only two of which are so close they
are interacting.

In the southwest corner (lower right) are a bunch of faint galaxies,
many of which seem to align in concentric arcs around a rather bright
orange galaxy. I find no red shift data on any of these but they are in
the position of a galaxy cluster candidate known as NSC J165634+585212.
It has a photographic red shift distance (likely based on 2MASS K band
data) of 1.8 billion light-years. NED lists no size or population for it.

The barred spiral on the very eastern edge of my image is SBS 1659+589.
NED has no red shift data on it but I'd expect it likely a member of
the same group as Arp 293. Just beyond it out of my frame are NGC 6290
and NGC 6291 with a red shift that puts them at 235 million light-years
and again, members of same group as Arp 293.

All my cloudy weather has allowed me to slowly catch up on my
processing. This marks my last May image. Next up June!

Arp's image
http://nedwww.ipac.caltech.edu/level...ig_arp293.jpeg

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

I've also attached a 1.5x cropped enlargement to better show some
details of the system.

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".

NGC 660 comes to mind. It is on the hard disk still to be processed.
Unfortunately, conditions weren't all that good.

Rick


Stefan Lilge wrote:
Great picture Rick. I don't remember another galaxy that has such a
prominent tilted dark lane.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
. com...
Arp 293 is a pair of interacting galaxies, NGC 6285 (right) and NGC 6286
in the constellation of Draco. A tidal bridge between the two is barely
visible in my image. The northern galaxy is classed as S0 pec. There
seems too much fragmentation and tidal plumes for me to tell what it was
before the interaction. The southern galaxy is considered an edge on Sb
spiral. Both appear to be LINER galaxies. Red shift puts them about
250 million light-years distant. Some sources say NGC 6286 (southern
galaxy) is a forming polar ring galaxy. Certainly it has an odd half
ring tidal feature that is well out of its plane of rotation. Also its
eastern arm appears nearly severed from the core with an brightening at
the very end of this lopped off arm. This may be a foreshortened bright
arm arc. Arp classed it under Group Character: Wind effects. His
comment about it was: "Diffuse arc south-following brighter galaxy."
Apparently referring to the same feature some see as the start of a
polar ring feature. This may also be the "wind effect" he refers to.

Some catalogs consider it a triple galaxy including the very edge on UGC
10641, an Sd galaxy to the southwest. It is about 240 million
light-years distant per its red shift. I see no hint of interaction
with the other two however. At a red shift that puts it 235 million
light-years away is the elliptical galaxy UGC 10646 at the very top of
my image. Keep in mind that orbital motions within a group of galaxies
can create a range of red shifts such as we see here such that the real
distance to each is not really shown by the red shift. Thus, these
galaxies are all likely at virtually the same distance and form a rather
nice "local group" of their own. Only two of which are so close they
are interacting.

In the southwest corner (lower right) are a bunch of faint galaxies,
many of which seem to align in concentric arcs around a rather bright
orange galaxy. I find no red shift data on any of these but they are in
the position of a galaxy cluster candidate known as NSC J165634+585212.
It has a photographic red shift distance (likely based on 2MASS K band
data) of 1.8 billion light-years. NED lists no size or population for it.

The barred spiral on the very eastern edge of my image is SBS 1659+589.
NED has no red shift data on it but I'd expect it likely a member of
the same group as Arp 293. Just beyond it out of my frame are NGC 6290
and NGC 6291 with a red shift that puts them at 235 million light-years
and again, members of same group as Arp 293.

All my cloudy weather has allowed me to slowly catch up on my
processing. This marks my last May image. Next up June!

Arp's image
http://nedwww.ipac.caltech.edu/level...ig_arp293.jpeg

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

I've also attached a 1.5x cropped enlargement to better show some
details of the system.

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".