ASTRO: KTG 67 Neat galaxy group you never heard of

I bet this is one few if any of you have heard of. I hadn't either
until Sakib Rasool suggested it. KTG stands for "Karachentsev Isolated
Triplets of Galaxies Catalogue" Though it appears there are 4 maybe 5
in this group. It is in Hercules about 140 million light-years from us
according to its redshift.

KTG67 officially consists of three galaxies, NGC 6484 on the west, UGC
11027 to the north east and UGC 11029 furthest east. Nearly directly
east from NGC 6484 is a pair of similar small disk galaxies situated
almost at right angles to each other. They are UGC 11010. The lower is
MCG +04-42-011 and the upper, nearly vertical one is MCG +04-42-010.
Only the latter has a red shift distance which is also about 140 million
light-years. I can't tell if the southerly one is a fifth member or not
as NED had no distance data on it.

The main reason for imaging this group is UGC 11027 a rather "sloshed"
galaxy. The stereotypical sloshed galaxy is NGC 5474 near M101. This
term applies to the off center core. Often it really isn't off center
by much, its just that the disk stars on one side are very faint
compared to those on the other side. That's the case with NGC 5474. My
image isn't deep enough to say if that's the case here. Though I see no
hint of a faint disk to the south and southwest to match the rest of the
disk.

A note at NED is rather confusing. It says: "Bright red condensation
0.45 x 0.25 in south-following part, superimposed companion?" Confusing
in that I see no hint of this object in my image nor the recently
released expanded Sloan Survey image. The note is from the original
release of the UGC catalog. NED classes it as Im meaning an irregular
galaxy. Looks to me like a barred spiral with one part missing. It
could very well be a merger situation however. There are some bright
knots on the eastern side that could be the remains of a merging galaxy.

UGC 11029 is classed as an SBd spiral. It does look quite typical of a
many armed spiral and thus likely not recently disturbed by its neighbors.

NGC 6484 may at first appear a rather normal barred spiral with two wide
arms. But to me it is very odd. First off, while the core is elongated
as you'd expect in a typical barred spiral there is no bar. In fact it
is classed as Sb? at NED. While one arm comes from an end of the core's
elongation the other starts out of nowhere well away from the core.
Also the arms have an odd symmetry. Each has a pair of bright blue star
clouds directly across the core from each other. Then further down the
spiral arms are a line of fainter blue star clouds also opposite each
other across the core. Coincidence or is there something behind the
scenes causing this? I have no idea. There is also a short plume going
to the southwest. This left over from some long ago interaction?

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".

Rick,

with the KTG you have something to do once you have all the Arp galaxies :-)
Actually these are some nice galaxies, I hope KTG contains more objects of
equal beauty.

Stefan


"Rick Johnson" schrieb im Newsbeitrag
. com...
I bet this is one few if any of you have heard of. I hadn't either
until Sakib Rasool suggested it. KTG stands for "Karachentsev Isolated
Triplets of Galaxies Catalogue" Though it appears there are 4 maybe 5
in this group. It is in Hercules about 140 million light-years from us
according to its redshift.

KTG67 officially consists of three galaxies, NGC 6484 on the west, UGC
11027 to the north east and UGC 11029 furthest east. Nearly directly
east from NGC 6484 is a pair of similar small disk galaxies situated
almost at right angles to each other. They are UGC 11010. The lower is
MCG +04-42-011 and the upper, nearly vertical one is MCG +04-42-010.
Only the latter has a red shift distance which is also about 140 million
light-years. I can't tell if the southerly one is a fifth member or not
as NED had no distance data on it.

The main reason for imaging this group is UGC 11027 a rather "sloshed"
galaxy. The stereotypical sloshed galaxy is NGC 5474 near M101. This
term applies to the off center core. Often it really isn't off center
by much, its just that the disk stars on one side are very faint
compared to those on the other side. That's the case with NGC 5474. My
image isn't deep enough to say if that's the case here. Though I see no
hint of a faint disk to the south and southwest to match the rest of the
disk.

A note at NED is rather confusing. It says: "Bright red condensation
0.45 x 0.25 in south-following part, superimposed companion?" Confusing
in that I see no hint of this object in my image nor the recently
released expanded Sloan Survey image. The note is from the original
release of the UGC catalog. NED classes it as Im meaning an irregular
galaxy. Looks to me like a barred spiral with one part missing. It
could very well be a merger situation however. There are some bright
knots on the eastern side that could be the remains of a merging galaxy.

UGC 11029 is classed as an SBd spiral. It does look quite typical of a
many armed spiral and thus likely not recently disturbed by its neighbors.

NGC 6484 may at first appear a rather normal barred spiral with two wide
arms. But to me it is very odd. First off, while the core is elongated
as you'd expect in a typical barred spiral there is no bar. In fact it
is classed as Sb? at NED. While one arm comes from an end of the core's
elongation the other starts out of nowhere well away from the core.
Also the arms have an odd symmetry. Each has a pair of bright blue star
clouds directly across the core from each other. Then further down the
spiral arms are a line of fainter blue star clouds also opposite each
other across the core. Coincidence or is there something behind the
scenes causing this? I have no idea. There is also a short plume going
to the southwest. This left over from some long ago interaction?

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".