ASTRO: SN2013am and 2/3rds of Arp 317 Reprocessed

After seeing these on the net I decided in my rush I'd pushed things a
bit too much to pick up the plumes. This version may be better.

Rick


M65 is part of Arp 317 which also includes NGC 3628 and M 66. I imaged
them individually several years ago. On March 21 a type II supernova
blew in Arp 65. As most of you know I've been imaging all the Arp
galaxies I can reach from this latitude. Over the years several have
had supernova go off in them. I've gone back to catch them with the
supernova. So wanted to add this one to the list but the weather hasn't
cooperated. Finally on April 2 (UTC) it did. I also managed to fit M
66 into the field as well. Conditions were forecast to be poor for
seeing but at least I could get color data. Turned out the seeing was
better than forecast so I was able to get it in one night. We did have
ground fog which didn't help the color. Blue really was hurt so I took
4 rounds of blue rather than my usual 2 but it still wasn't all that good.

My rather crude estimate of the supernova's brightness is 15.7. Those
with large Dobsonian scopes can likely just see it visually though you
will likely need high power. This seems rather dim though some type II
supernova spend so much energy tearing the star apart little is left to
make it bright. In this case the star appears to be in a dust lane. Not
seeing it in 3D it could be above the dust so not dimmed by it or it
could be within it and this accounts for its rather dim nature.

The three galaxies of Arp 317 are said to be interacting. While it is
obvious that M 66 has been distorted by some interaction and has a large
plume to the north and northwest. It is a very active galaxy with lots
of star formation apparently triggered by the interaction. NGC 3638 has
a tidal plume (that I failed to pick up due to insufficient exposure) I
see little indication that M 65 is seriously distorted by any
interaction. It looks pretty typical to the eye.

While redshift puts the trio about 50 million light-years away the
accepted distance for them is about 35 million light-years. Not a
surprising difference as the group is traveling through space together.
This motion can add or subtract from the cosmological redshift
distance enough to account for the difference. Redshift is sufficient
to say the distance is 100 million or 200 million light-years but isn't
accurate enough to work very well with our near neighbors like this group.

I notice a group of faint galaxies in the image at 1.63 billion
light-years give or take a bit. The search radius of my field failed to
turn up any group at that distance labeled in NED.

This is a rather quick process as time is tight here. But at least the
sky finally cleared allowing me to get this one. Bad weather returns
tonight however.

14" LX200R @ f/10, L=6x10' RG=2x10' B=4x10', STL-11000XM, Paramount ME

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

Rick Johnson wrote in news:515bef43$0$20012$862e30e2
@ngroups.net:

After seeing these on the net I decided in my rush I'd pushed things a
bit too much to pick up the plumes. This version may be better.

Rick, both sets of photos are beautiful. Those two are a really
eye catching pair and your rendition does them justice.

Brian
--
http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism
Sed quis custodiet ipsos Custodes?

Rick,

this must be one of the best pictures featuring the SN that exist.
Contrast is very high, sure helps to bring out the detail.

Stefan


"Rick Johnson" schrieb im Newsbeitrag
...

After seeing these on the net I decided in my rush I'd pushed things a
bit too much to pick up the plumes. This version may be better.

Rick


M65 is part of Arp 317 which also includes NGC 3628 and M 66. I imaged
them individually several years ago. On March 21 a type II supernova
blew in Arp 65. As most of you know I've been imaging all the Arp
galaxies I can reach from this latitude. Over the years several have
had supernova go off in them. I've gone back to catch them with the
supernova. So wanted to add this one to the list but the weather hasn't
cooperated. Finally on April 2 (UTC) it did. I also managed to fit M
66 into the field as well. Conditions were forecast to be poor for
seeing but at least I could get color data. Turned out the seeing was
better than forecast so I was able to get it in one night. We did have
ground fog which didn't help the color. Blue really was hurt so I took
4 rounds of blue rather than my usual 2 but it still wasn't all that good.

My rather crude estimate of the supernova's brightness is 15.7. Those
with large Dobsonian scopes can likely just see it visually though you
will likely need high power. This seems rather dim though some type II
supernova spend so much energy tearing the star apart little is left to
make it bright. In this case the star appears to be in a dust lane. Not
seeing it in 3D it could be above the dust so not dimmed by it or it
could be within it and this accounts for its rather dim nature.

The three galaxies of Arp 317 are said to be interacting. While it is
obvious that M 66 has been distorted by some interaction and has a large
plume to the north and northwest. It is a very active galaxy with lots
of star formation apparently triggered by the interaction. NGC 3638 has
a tidal plume (that I failed to pick up due to insufficient exposure) I
see little indication that M 65 is seriously distorted by any
interaction. It looks pretty typical to the eye.

While redshift puts the trio about 50 million light-years away the
accepted distance for them is about 35 million light-years. Not a
surprising difference as the group is traveling through space together.
This motion can add or subtract from the cosmological redshift
distance enough to account for the difference. Redshift is sufficient
to say the distance is 100 million or 200 million light-years but isn't
accurate enough to work very well with our near neighbors like this group.

I notice a group of faint galaxies in the image at 1.63 billion
light-years give or take a bit. The search radius of my field failed to
turn up any group at that distance labeled in NED.

This is a rather quick process as time is tight here. But at least the
sky finally cleared allowing me to get this one. Bad weather returns
tonight however.

14" LX200R @ f/10, L=6x10' RG=2x10' B=4x10', STL-11000XM, Paramount ME

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