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ASTRO: Arp253 REPOST



 
 
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Old December 19th 09, 10:21 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Default ASTRO: Arp253 REPOST

SpaceBanter failed to pick up the image and I have friends that use it
after losing their ISP news service. So reposting for them.
__________________

Arp 253 is a pair of probably interacting galaxies located near the
western border of Sextans about 100 million light-years distant. At
least that's the distance to the western galaxy which is also cataloged
as UGCA 173. A secondary distance estimate puts it at 90 million light
years. Since galaxies have motions besides that of the expansion of the
universe the difference is really quite normal and expected. It is
classed by NED as SB(s)dm? The eastern galaxy is UGCA 174. There's no
distance estimates for it but likely it is truly interacting with UGCA
173 and thus at the same distance. It is classed as SB(s)m? Arp's only
comment indicates there may be some stellar resolution or else HII
regions. At that distance the latter would most likely be what he was
seeing. Arp classed it under Galaxies (not classifiable as S or E);
appearance of fission. As with most galaxies in the classification I
don't seem to understand why he says that. Does he mean the two
galaxies look like two rod like bacterial splitting? They often move
around like two train cars before splitting completely. Or is he
referring to the various parts of UGCA 173?

The reddish round galaxy SW of Arp 253 is 2MASX J09430672-0518514. I
have no information on it. Far more interesting is MCG -01-25-033, the
"large" galaxy south of Arp 253. It's red shift puts it also at about
100 million light years indicating it is part of the same group. It is
not mentioned by Arp but sure looks peculiar enough to have made his
catalog. NED classes it as SB(s)d pec. It may also have interacted in
the past with other galaxies in the group.

Above Arp 253 about the same distance as MCG -04-25-033 is south of it
is 2MASX J09432459-0510450, a small round galaxy of unknown distance or
classification. Toward the upper right corner is another orange galaxy
just below and right of a blue star. It is 2MASX J09423777-0509328 at
750 million light years.

The orange galaxy near the left edge several minutes of arc below the
top edge is 2MASX J09442604-0511330 at about 800 million light years.
Above it, right in the top left corner is 2MASX J09442771-0508030, yet
another IR strong galaxy. It too is at 800 million light years.

While there are a lot more galaxies in the image only those in the 2MASS
survey are cataloged and I've listed all with red shift data. SDSS
hasn't covered this region nor has Arp 253 been imaged by the HST.

The asteroid is (84901) 2003 TF13 at an estimated 17.9 magnitude.

The last blue exposure was 10 seconds too long as the object reached the
mount's meridian limit. So there was a short blue trail on each bright
star. I didn't even notice it until I was about to post this and
suddenly saw it on the bright star to the lower right. At first I
thought it another asteroid trail until I realized fainter stars had
similar trails. I only cloned out the bright one so the fainter ones
are still there if you look closely enough.

Arp's image is at:
http://nedwww.ipac.caltech.edu/level...ig_arp253.jpeg

14" LX200R @ f/10, L=4x10' 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".

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