ASTRO: A pair of galaxies Arp missed

This interesting pair of galaxies is located in Cancer a bit over 3
degrees northwest of M44. They are at quite different distances so are
unrelated. I'll start with the NGC galaxy as it is the less interesting
to me of the two.

NGC 2595 is classified as SAB(rs)c at NED and is located a bit over 200
million light-years from us. At that distance it is about 160,000
light-years across if you count the tip of the extended arm. I found
these notes on it at NED:
Slightly asymmetric spiral pattern, no disturbing object visible (de
Vaucouleurs)

"Bc with compact blue core and blue spiral arms" (CGPG)

`Barred spiral with prominent nucleus and distorted outer regions which
extend to 70" = 18 kpc radius. There are no other galaxies nearby' (Sargent)

Yet NED indicates there is a possible disturbing object, ASK 484686.0.
It looks as if it is a knot in a rather detached arm segment but NED
doesn't indicate it is part of NGC 2595. It may be all that remains
from the core of a disturbing galaxy or it may just be a star knot. In
any case it is surprising it didn't make Arp's list with the highly
pulled out arm.

UGC 04414 appears to be a barred spiral with a detached ring. It is
nearly 350 million light-years distant by redshift and even further away
by other distance estimates. It is classed as S0a rather than a barred
spiral. That might explain the inner structure, S0 galaxies can be
spindles, but what about that ring? The one note at NED on it says:
"...lens with high surface brightness." Again that's the inner
structure, what about the ring? I wish I knew. I found nothing on it.
How does everyone ignore this well formed ring? Maybe I've missed
something. If so, please let me know.

The annotated image includes several galaxy clusters. The distance to
most is by photographic redshift while the distance to the Big Cluster
Galaxy is usually spectroscopic and more likely the better distance
estimate. Photographic redshift is indicated with a "p" after the
distance. Also included is a galaxy group of 6 galaxies with a
spectroscopic redshift that matches that of a 15 member galaxy cluster's
big cluster galaxy. There's nothing seen at the position for the group
but its error bar is 15 seconds of arc which does include a couple faint
fuzzies but not the big cluster galaxy. Still I think they are
referring to the same object. Besides the normal collection of faint
fuzzies there is one blue quasar in the upper left corner at nearly 11
billion light-years.

The most distant galaxy I caught is SDSS J082745.70+213635.6 at 6.5
billion light-years. At magnitude 22.3 it is barely visible after the
losses of JPG compression. Enlarge the image and it should show up.

Also I caught two asteroids, (139935) 2001 RW133 at magnitude 19.2 and
(89594) 2001 XS147 at magnitude 19.5 according to the Minor Planet
Center. The are moving nearly parallel to each other in the lower left
part of the image.

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

Rick
--
Prefix is correct. Domain is arvig dot net

Mighty image Rick. Two such interesting galaxies in one field and in that
quality are a rare thing.
Probably too faint for me though...

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...

This interesting pair of galaxies is located in Cancer a bit over 3
degrees northwest of M44. They are at quite different distances so are
unrelated. I'll start with the NGC galaxy as it is the less interesting
to me of the two.

NGC 2595 is classified as SAB(rs)c at NED and is located a bit over 200
million light-years from us. At that distance it is about 160,000
light-years across if you count the tip of the extended arm. I found
these notes on it at NED:
Slightly asymmetric spiral pattern, no disturbing object visible (de
Vaucouleurs)

"Bc with compact blue core and blue spiral arms" (CGPG)

`Barred spiral with prominent nucleus and distorted outer regions which
extend to 70" = 18 kpc radius. There are no other galaxies nearby' (Sargent)

Yet NED indicates there is a possible disturbing object, ASK 484686.0.
It looks as if it is a knot in a rather detached arm segment but NED
doesn't indicate it is part of NGC 2595. It may be all that remains
from the core of a disturbing galaxy or it may just be a star knot. In
any case it is surprising it didn't make Arp's list with the highly
pulled out arm.

UGC 04414 appears to be a barred spiral with a detached ring. It is
nearly 350 million light-years distant by redshift and even further away
by other distance estimates. It is classed as S0a rather than a barred
spiral. That might explain the inner structure, S0 galaxies can be
spindles, but what about that ring? The one note at NED on it says:
"...lens with high surface brightness." Again that's the inner
structure, what about the ring? I wish I knew. I found nothing on it.
How does everyone ignore this well formed ring? Maybe I've missed
something. If so, please let me know.

The annotated image includes several galaxy clusters. The distance to
most is by photographic redshift while the distance to the Big Cluster
Galaxy is usually spectroscopic and more likely the better distance
estimate. Photographic redshift is indicated with a "p" after the
distance. Also included is a galaxy group of 6 galaxies with a
spectroscopic redshift that matches that of a 15 member galaxy cluster's
big cluster galaxy. There's nothing seen at the position for the group
but its error bar is 15 seconds of arc which does include a couple faint
fuzzies but not the big cluster galaxy. Still I think they are
referring to the same object. Besides the normal collection of faint
fuzzies there is one blue quasar in the upper left corner at nearly 11
billion light-years.

The most distant galaxy I caught is SDSS J082745.70+213635.6 at 6.5
billion light-years. At magnitude 22.3 it is barely visible after the
losses of JPG compression. Enlarge the image and it should show up.

Also I caught two asteroids, (139935) 2001 RW133 at magnitude 19.2 and
(89594) 2001 XS147 at magnitude 19.5 according to the Minor Planet
Center. The are moving nearly parallel to each other in the lower left
part of the image.

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

Rick
--
Prefix is correct. Domain is arvig dot net