A Space & astronomy forum. SpaceBanter.com

Go Back   Home » SpaceBanter.com forum » Others » Astro Pictures
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

ASTRO: Arp 191 under very bad seeing



 
 
Thread Tools Display Modes
  #1  
Old November 28th 09, 09:15 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default ASTRO: Arp 191 under very bad seeing

Arp 191 is a pair of colliding galaxies in the constellation of Leo the
lion. They are a bit under 400 million light years away. Arp made this
comment about them: "Acute bend in link between galaxies; plumes from
stellar-like images." He classified them under Galaxies (not
classifiable as S or E): Narrow Filaments. Two filaments are quite
obvious. One connects the two galaxies, and is kinked as his comment
mentions. The other comes from one of the blue condensations in eastern
galaxy. This galaxy pair was taken under rather poor skies and I was
unable to resolve them like I'd have liked. Notice in Arp's image that
one of the blue knots in the eastern galaxy, northern one, is composed
of at least three star clusters. It's from these the kinked plume
appears to come. The pair is known as UGC 6175.

The western galaxy is classed as SAB0- pec. While the eastern one is
classes as SAB(r)0+ pec. The galaxy CGCG 095-114 to the southwest is at
about the same distance and likely a member of the group. One catalog
includes them as a 3 member group under the [RPG97] 114 designation.
Slightly closer to Arp 191 but to the northeast is MCG +03-29-001.
Unfortunately there's no distance data on it. It does appear possible
it too is about the same distance from us as the other three. West and a
bit north of CGCG 095-114 is MAPS-NGP O_432_0257420. Well north of this
latter galaxy and a bit east is SDSS J110642.31+183148.7. No red shift
data was found for these last two or any other galaxy in the image in
the NED database.

The large galaxy at the top of the image is UGC 06171. It is far closer
at about 70 to 75 million light years depending on who you listen to. I
was originally going to image this when east of the meridian but clouds
moved in and didn't clear until it was west of the meridian. I'd
noticed this galaxy and made a note to move Arp 191 below center to be
sure to pick it up. But when I flipped to the other side of the
meridian that inverts the camera so I now had to move it the other way
but I obeyed my note, started the image and went to bed. I discovered
my mistake only now, some 8.5 months later. Too late to correct it so
this galaxy is slightly cut off. I should have said to move Arp 191 a
bit south of center and all would have been fine. Sometimes my dumbth
gets in the way. When I say the clouds cleared there was still a rather
thick haze as well as very unstable air. Seeing was almost 4", compared
to my 2.5" normal for this period limiting my ability to record the
detail needed. Another one for the reshoot list!

There are two asteroids in the image. The brightest, (31619) 1999 GU18
at magnitude 17.2 is seen along the upper right edge. The fainter
(55112) Mariangela at magnitude 18.2. It lies due west from CGCG
095-114. Both show as two short lines. The brighter shows color
between these two dashes. The bright dashes are due to the luminosity
images which were taken 2 at a time with color data between them and
after them. Due to the weak signal Of this object through a thick haze
I used all 4 luminosity images plus the 6 color images to make a pseudo
luminosity image. This gave the color data some luminosity data to
color creating the color dashes between the two luminosity images. The
fainter one was just too faint for the color data to record sufficiently
above the noise level so very little is seen during the time color data
was taken.

This was my final February object. I'm finally moving into March data!

SDSS image:
http://astronomerica.awardspace.com/...C6175-SDSS.jpg

Arp's image
http://nedwww.ipac.caltech.edu/level...ig_arp191.jpeg

14" LX200R @ f/10, L=4x10' plus all RGB, RGB=2x10', 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".

Attached Thumbnails
Click image for larger version

Name:	ARP191COMBINEL4X10RGB2X10r.jpg
Views:	469
Size:	188.3 KB
ID:	2727  
  #2  
Old November 29th 09, 10:20 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default ASTRO: Arp 191 under very bad seeing

A nice pair, even with bad seeing.
If your backlog grows some months more you are "in season" again with your
images ;-)

Stefan

"Rick Johnson" schrieb im Newsbeitrag
om...
Arp 191 is a pair of colliding galaxies in the constellation of Leo the
lion. They are a bit under 400 million light years away. Arp made this
comment about them: "Acute bend in link between galaxies; plumes from
stellar-like images." He classified them under Galaxies (not
classifiable as S or E): Narrow Filaments. Two filaments are quite
obvious. One connects the two galaxies, and is kinked as his comment
mentions. The other comes from one of the blue condensations in eastern
galaxy. This galaxy pair was taken under rather poor skies and I was
unable to resolve them like I'd have liked. Notice in Arp's image that
one of the blue knots in the eastern galaxy, northern one, is composed
of at least three star clusters. It's from these the kinked plume
appears to come. The pair is known as UGC 6175.

The western galaxy is classed as SAB0- pec. While the eastern one is
classes as SAB(r)0+ pec. The galaxy CGCG 095-114 to the southwest is at
about the same distance and likely a member of the group. One catalog
includes them as a 3 member group under the [RPG97] 114 designation.
Slightly closer to Arp 191 but to the northeast is MCG +03-29-001.
Unfortunately there's no distance data on it. It does appear possible
it too is about the same distance from us as the other three. West and a
bit north of CGCG 095-114 is MAPS-NGP O_432_0257420. Well north of this
latter galaxy and a bit east is SDSS J110642.31+183148.7. No red shift
data was found for these last two or any other galaxy in the image in
the NED database.

The large galaxy at the top of the image is UGC 06171. It is far closer
at about 70 to 75 million light years depending on who you listen to. I
was originally going to image this when east of the meridian but clouds
moved in and didn't clear until it was west of the meridian. I'd
noticed this galaxy and made a note to move Arp 191 below center to be
sure to pick it up. But when I flipped to the other side of the
meridian that inverts the camera so I now had to move it the other way
but I obeyed my note, started the image and went to bed. I discovered
my mistake only now, some 8.5 months later. Too late to correct it so
this galaxy is slightly cut off. I should have said to move Arp 191 a
bit south of center and all would have been fine. Sometimes my dumbth
gets in the way. When I say the clouds cleared there was still a rather
thick haze as well as very unstable air. Seeing was almost 4", compared
to my 2.5" normal for this period limiting my ability to record the
detail needed. Another one for the reshoot list!

There are two asteroids in the image. The brightest, (31619) 1999 GU18
at magnitude 17.2 is seen along the upper right edge. The fainter
(55112) Mariangela at magnitude 18.2. It lies due west from CGCG
095-114. Both show as two short lines. The brighter shows color
between these two dashes. The bright dashes are due to the luminosity
images which were taken 2 at a time with color data between them and
after them. Due to the weak signal Of this object through a thick haze
I used all 4 luminosity images plus the 6 color images to make a pseudo
luminosity image. This gave the color data some luminosity data to
color creating the color dashes between the two luminosity images. The
fainter one was just too faint for the color data to record sufficiently
above the noise level so very little is seen during the time color data
was taken.

This was my final February object. I'm finally moving into March data!

SDSS image:
http://astronomerica.awardspace.com/...C6175-SDSS.jpg

Arp's image
http://nedwww.ipac.caltech.edu/level...ig_arp191.jpeg

14" LX200R @ f/10, L=4x10' plus all RGB, RGB=2x10', 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".



 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] Astronomy Misc 0 May 3rd 07 01:08 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] SETI 0 May 3rd 07 01:08 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] Astronomy Misc 0 April 12th 07 01:05 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] SETI 0 April 12th 07 01:05 AM
[sci.astro,sci.astro.seti] Contents (Astronomy Frequently Asked Questions) (0/9) [email protected] Astronomy Misc 0 May 3rd 06 12:33 PM


All times are GMT +1. The time now is 07:38 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.