Arp 300 with a hint of Cirrus

Arp 300 is in his class "Group galaxies: Double galaxies. They are UGC
5028 and UGC 5029, right to left. But UGC 5028 is itself a double
galaxy MRK 111 NOTES1 and MRK 111 Notes2 top to bottom. So we really
have three. Or is it four? Note the thin needle "galaxy" to the lower
left of UGC 5029. Oddly it isn't in the Sloan survey that I can find
nor any other catalog yet quite obvious. Arp apparently mentions it in
his notes when he says, "Note elongated feature pointing toward nucleus
of larger spiral." Apparently he didn't consider it a galaxy nor does
anyone else. Sure looks like one to me. It likely is far in the
background but without data that's only a guess.

Note there is yet another double galaxy in the area. Below UGC 5028 is
a pair of very orange galaxies; VII Zw 280 NOTES04 (top) and VII Zw 280
NOTES03 (bottom). I find no red shift data on them but they too appear
far in the background. Arp included them in his photo.

So how far away are the galaxies in Arp 300? Simple answer is about 180
million light-years. But this varies some by whose red shift you
believe. Galaxies in a group orbit around a common center of gravity
which gives them each a different red shift. When the group is small
there's no good way of determining an average velocity. The dance they
do can be very complicated to sort out. Individually, per NED the
distances using 5 year WMAP data a UGC 5029 181 million light-years,
MRK 111 NOTES1 178 million light-years and MRK 111 NOTES2 185 million
light-years. Note the cores of MRK 111 show quite different colors in
my image. At first I suspected the bottom one to be a star in our
galaxy not a galaxy core but the red shift data shows that was very wrong.

There's a galaxy cluster candidate, NSC J092952+683500, in the upper
left corner of my image. I see a bunch of very orange galaxies in that
area. None have red shift data however. So I don't know if they are
the cluster or it is something fainter. The cluster is said to be 4
billion light years distant so if it contains some giant ellipticals
they might be at least some of the orange galaxies in that area in my image.

The featureless blob of a galaxy on the right edge of my image is UGC
04998, a nearby galaxy only about 30 million light years from us. So it
is far closer than any other galaxy in the image. It is a Im galaxy.

These galaxies are located in Ursa Major not far from M81 and M82. That
likely explains the galactic cirrus that appeared in the image much to
my surprise. Most of it is at near background level so appears as
background noise but for the ribbon running vertically through the
image. It was taken in late January but just recently processed.


Arp's image is at:
http://nedwww.ipac.caltech.edu/level...ig_arp300.jpeg

14" LX200R @ f/10, L=4x10' RGB=2x10'x3, STL-11000XM, Paramount ME
--
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 pulled a lot of detail out of these small galaxies.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
. com...

Arp 300 is in his class "Group galaxies: Double galaxies. They are UGC
5028 and UGC 5029, right to left. But UGC 5028 is itself a double
galaxy MRK 111 NOTES1 and MRK 111 Notes2 top to bottom. So we really
have three. Or is it four? Note the thin needle "galaxy" to the lower
left of UGC 5029. Oddly it isn't in the Sloan survey that I can find
nor any other catalog yet quite obvious. Arp apparently mentions it in
his notes when he says, "Note elongated feature pointing toward nucleus
of larger spiral." Apparently he didn't consider it a galaxy nor does
anyone else. Sure looks like one to me. It likely is far in the
background but without data that's only a guess.

Note there is yet another double galaxy in the area. Below UGC 5028 is
a pair of very orange galaxies; VII Zw 280 NOTES04 (top) and VII Zw 280
NOTES03 (bottom). I find no red shift data on them but they too appear
far in the background. Arp included them in his photo.

So how far away are the galaxies in Arp 300? Simple answer is about 180
million light-years. But this varies some by whose red shift you
believe. Galaxies in a group orbit around a common center of gravity
which gives them each a different red shift. When the group is small
there's no good way of determining an average velocity. The dance they
do can be very complicated to sort out. Individually, per NED the
distances using 5 year WMAP data a UGC 5029 181 million light-years,
MRK 111 NOTES1 178 million light-years and MRK 111 NOTES2 185 million
light-years. Note the cores of MRK 111 show quite different colors in
my image. At first I suspected the bottom one to be a star in our
galaxy not a galaxy core but the red shift data shows that was very wrong.

There's a galaxy cluster candidate, NSC J092952+683500, in the upper
left corner of my image. I see a bunch of very orange galaxies in that
area. None have red shift data however. So I don't know if they are
the cluster or it is something fainter. The cluster is said to be 4
billion light years distant so if it contains some giant ellipticals
they might be at least some of the orange galaxies in that area in my
image.

The featureless blob of a galaxy on the right edge of my image is UGC
04998, a nearby galaxy only about 30 million light years from us. So it
is far closer than any other galaxy in the image. It is a Im galaxy.

These galaxies are located in Ursa Major not far from M81 and M82. That
likely explains the galactic cirrus that appeared in the image much to
my surprise. Most of it is at near background level so appears as
background noise but for the ribbon running vertically through the
image. It was taken in late January but just recently processed.


Arp's image is at:
http://nedwww.ipac.caltech.edu/level...ig_arp300.jpeg

14" LX200R @ f/10, L=4x10' RGB=2x10'x3, STL-11000XM, Paramount ME
--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".