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Reprocessed Arp 102 for Guilherme Couto



 
 
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  #1  
Old June 5th 12, 01:26 AM
WA0CKY WA0CKY is offline
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Default Reprocessed Arp 102 for Guilherme Couto

Guilherme,

It now shows much more of the plume than the NOAO image: http://www.noao.edu/image_gallery/html/im0003.html

Color is better as well.

Rick
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  #2  
Old June 10th 12, 08:01 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default Reprocessed Arp 102 for Guilherme Couto

I can't seem to know when to stop. A bit more reprocessing.

Here's the original text.
_______________________________________

Arp 102 is also known as Zwicky's Connected Galaxies, not to be confused
with Arp 103 known as Zwicky's Connected Multiple System that I ran last
week. This one was difficult to research. I found little on the
galaxies involved and some catalogs have the position of one or more
wrong. Few other galaxies in the field are cataloged and again when
they were I found their positions often in error apparently due to
incorrect precession calculation as ALADIN's image overlay was shifted
in some areas in the direction of precession motion in this part of the
sky. Not only that, NED and SIMBAD sometimes had different coordinates,
neither of which were correct. I'm not sure if we have 2 or 3 galaxies
here. The brightening in the southern end of the northern galaxy is
listed as a separate galaxy in some catalogs. It appears it could be a
one armed dwarf spiral. While I never found anything on it, it could be
they are a merger in progress with that brightening being the remains of
the canibalized galaxy. This may explain the very large tidal tail to
the north.

The main galaxy is UGC 10814 or VV10a, The possible galaxy at its south
end is MCG+8-31-42 or VV10b. The brightening toward the north end of
the big tidal arm is VV10c. So was it a separate galaxy at one time? I
doubt it but can't say no either. UGC 10814 is classed as Sb. No
pecular designation. MCG+8-31-42 is classed as Sd. Again no pec
designation. The southern large member is the E0 galaxy MCG +08-31-041.
It is noted to be a Seyfert and LINER galaxy. It's core is quite
active probably due to its interaction with UCG 10814. It is also
cataloged as Arp B with Arp 102a being UGC 10814. There is no Arp 102c.

This system is about 327 million light years distant in northern
Hercules. Arp's comment: "Note loop E side of sprial; difuse, very
faint connection to E galaxy." The loop is very blue in my image. The
last part makes no sense to me. If he is using the spiral as his
reference (UGC 10814) then the ellipical that is connected by a very
faint tidal arm is southwest not east.

About 6 minutes east and a bit south of UGC 10814 is what appears to be
a pair of interacting blue galaxies. They are LEDA 140772. I can't
find anything on this being one or two galaxies. Nor can I find a
distance for it. A bit below it is a blue star with a tiny anonymous
galaxy to its right. Below this is a fairly red galaxy. There's a star
to its left and a starlike galaxy above this star making a compact
triangle. If you precess their coordinates back about 1990 coordinates
instead of 2000 you come to the positions in SIMBAD for 1E 1718.6+4902 a
Seyfert galaxy and CIG 1719+48. NED lists the Seyfert as MS 1718.6+4902
with a position 20" south and a bit west but the magnitude and Seyfert
classification is correct. Nothing is seen at NED's position even
though it is listed as magnitude 19.1 which should show easily. If they
are the same then it is 2.4 billion light years. Its color is typical
of galaxies at that distance. The galaxy to its NE is not in NED.
SIMBAD lists it as CIG 1719+48. The numbers designate their RA and
Declination but are not accurate enough to settle this position issue.
Positions of the two catalogs are different epochs. This is why the
northern galaxy appears to be the southern one. It is J2000 while the
other appears to be B1950. Dennis Webb tells me issues like this
delayed their book on the Arp galaxies by 3 years. I can fully
appreciate this!

The largest galaxy besides those in Arp 102 is 2MFGC 13790 which is east
of the southern galaxy of Arp 102. It is an obvious edge on spiral.
But I have no distance information on it. Above it is a pair of
galaxies that may be interacting or just along the same line of sight.
Unfortunately, they are anonymous in both NED and SIMBAD. The Sky does
say one of them, probably the western one, is PGC 2331580
Unfortunately, this is the case with the rest of the galaxies in the
image. Only about 4 are listed with little useful data but for
coordinates, all in the 2MASX survey of infrared galaxies.

No Hubble or SDSS image available

Arp's image:
http://nedwww.ipac.caltech.edu/level...ig_arp102.jpeg

14" LX200R 14" f/10, L=4x10' RGB=3x10'x3, STL-11000XM, Paramount ME

Rick


On 6/4/2012 7:26 PM, WA0CKY wrote:
Guilherme,

It now shows much more of the plume than the NOAO image:
http://www.noao.edu/image_gallery/html/im0003.html

Color is better as well.

Rick




--
Prefix is correct. Domain is arvig dot net

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