ASTRO: FGC 601 AKA The Integral Sign Galaxy

UGC 3697/FGC 601 is commonly known as the Integral Sign Galaxy. Oddly,
Arp had 6 galaxies in his category for integral sign shaped galaxies but
omitted this one. To most observers UGC 3697 better fits the category
than any Arp included. Why he omitted it is unknown. He included many
very well known galaxies including 11 entries for Messier galaxies so
apparently being well known didn't prevent it from being an entry.
Maybe because it was well known for that trait? It's been a mystery to me.

I had this one on my to-do list twice but couldn't reach it due to my
Polaris trees until recently. It was on both for being distorted and
for being in the Flat Galaxy catalog. It's the size of the central
bulge compared to the length of the disk that qualifies a galaxy for the
FGC catalog so the warping of it is ignored. Since it's bulge is less
than 12.5% of its length it qualifies warped or not. In fact it has
little discernible bulge in my image. It is one of a trio of galaxies
known as WBL 132. They form a chain starting with UGC 3697 and going
southeast to UGC 3714 and ending with the tiny (in angular size) KUG
0707+717. With no redshift for the latter I can't say if it is
physically related or not. I doubt it is.

The first two are both about 140 million light-years distant by redshift
and both are distorted looking. The disk of the Integral Sign Galaxy
has been warped into about the shape of that mathematical sign with
bright star knots, especially at the western end. UGC 3714 is a face on
spiral with a huge outer halo normally not seen in such otherwise rather
normal galaxies. It appears the halo is spherical as the spiral
features seem partly hidden by the "fog" of the halo stars giving it an
indistinct spiral appearance. NED classes it as S? pec. Looks pretty
much like Sab or Sb to me. Not sure why the ? though the pec is likely
due to the large apparently spherical halo. Film images of it show only
hints of its spiral structure so might be why it couldn't be classed
further. The Integral Sign Galaxy is classed as Sd: Pec. Obviously for
its warped disk. It is quite likely the distortions of these two are
due, at least in part, to interaction between them in the recent past.

The third member of the group, KUG 0707+717, has little info at NED.
They class it as simply Spiral. It appears to be near edge on though
there's a hint of detail. It too seems to have a halo about it though
much smaller than that of UGC 3714.

West southwest from UGC 3714 is a blue irregular galaxy. NED omits it
entirely. Is it naturally this way or did it interact with one or more
of the WBL 132 members? I suspect if seen more closely it would be
quite an interesting galaxy. The little edge on spiral west of UGC 3714
is 2MASX J07120524+7145290. There's little else on it however.

On the west edge of the frame are some galaxies at 1.34-1.35 billion
light-years. These are likely outlying members of ABELL 565 which NED
lists at 1.36 billion light-years. The core is 12 minutes beyond the
right edge of the middle of the image.

14" LX200R @ f/10, L=4x10' RGB-2x10', STL-11000XM, Paramount ME
--
Prefix is correct. Domain is arvig dot net

Rick,

when it comes to integral signs it doesn't get much better than this :-)
And a lot of small stuff as well.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...

UGC 3697/FGC 601 is commonly known as the Integral Sign Galaxy. Oddly,
Arp had 6 galaxies in his category for integral sign shaped galaxies but
omitted this one. To most observers UGC 3697 better fits the category
than any Arp included. Why he omitted it is unknown. He included many
very well known galaxies including 11 entries for Messier galaxies so
apparently being well known didn't prevent it from being an entry.
Maybe because it was well known for that trait? It's been a mystery to me.

I had this one on my to-do list twice but couldn't reach it due to my
Polaris trees until recently. It was on both for being distorted and
for being in the Flat Galaxy catalog. It's the size of the central
bulge compared to the length of the disk that qualifies a galaxy for the
FGC catalog so the warping of it is ignored. Since it's bulge is less
than 12.5% of its length it qualifies warped or not. In fact it has
little discernible bulge in my image. It is one of a trio of galaxies
known as WBL 132. They form a chain starting with UGC 3697 and going
southeast to UGC 3714 and ending with the tiny (in angular size) KUG
0707+717. With no redshift for the latter I can't say if it is
physically related or not. I doubt it is.

The first two are both about 140 million light-years distant by redshift
and both are distorted looking. The disk of the Integral Sign Galaxy
has been warped into about the shape of that mathematical sign with
bright star knots, especially at the western end. UGC 3714 is a face on
spiral with a huge outer halo normally not seen in such otherwise rather
normal galaxies. It appears the halo is spherical as the spiral
features seem partly hidden by the "fog" of the halo stars giving it an
indistinct spiral appearance. NED classes it as S? pec. Looks pretty
much like Sab or Sb to me. Not sure why the ? though the pec is likely
due to the large apparently spherical halo. Film images of it show only
hints of its spiral structure so might be why it couldn't be classed
further. The Integral Sign Galaxy is classed as Sd: Pec. Obviously for
its warped disk. It is quite likely the distortions of these two are
due, at least in part, to interaction between them in the recent past.

The third member of the group, KUG 0707+717, has little info at NED.
They class it as simply Spiral. It appears to be near edge on though
there's a hint of detail. It too seems to have a halo about it though
much smaller than that of UGC 3714.

West southwest from UGC 3714 is a blue irregular galaxy. NED omits it
entirely. Is it naturally this way or did it interact with one or more
of the WBL 132 members? I suspect if seen more closely it would be
quite an interesting galaxy. The little edge on spiral west of UGC 3714
is 2MASX J07120524+7145290. There's little else on it however.

On the west edge of the frame are some galaxies at 1.34-1.35 billion
light-years. These are likely outlying members of ABELL 565 which NED
lists at 1.36 billion light-years. The core is 12 minutes beyond the
right edge of the middle of the image.

14" LX200R @ f/10, L=4x10' RGB-2x10', STL-11000XM, Paramount ME
--
Prefix is correct. Domain is arvig dot net