I've reported on this cluster (and the adjacent Abell 2197) in past TAC OR's. You can find detailed finder charts and object lists for A2197 and A2199 on my webpages at: http://pw2.netcom.com/~ahighe/A2197.htm and http://pw2.netcom.com/~ahighe/a2199temp.htm.
The object lists also contain the available radial velocities of galaxies in the area.
Uranometria indicates member galaxies lie within partially overlapping circles with diameters approximately 1.5° and lying 1.5° apart. My target lists, generated by searching the NASA/IPAC Extragalactic Database (NED), include selected galaxies within 1° of each cluster center. In addition to the apparent spatial overlap of the clusters, radial velocities of galaxies in the two clusters also overlap. Consequently, it is difficult to unambiguously assign membership to galaxies in the overlap region. I haven't seen any papers that specifically discuss whether the surrounding members are "satellites" of NGC 6166. However, based on their radial velocities and proximity to the center, they are likely gravitationally bound within the cluster.
I currently have observed 120 galaxies within A2197 and 99 galaxies within A2199. Seven members are common to both lists.
Albert
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Abell 2199 observation and question....
From: Mark Wagner ^lt;mark.wagner_at_resource-intl.com>
Date: Tue Oct 04 2005 - 09:57:56 PDT
Richard Navarrete and I observed part of Abell 2199 in Hercules while at
CalStar. NGC 6166 was our target, a slightly extended mag 13 galaxy with,
as expected, several other galaxies nearby ranging in size from near
stellar to roughly the size of 6166. Around 6166 is a nice "ring" of
smaller galaxies. When I saw their position on my laptop while out
observing, I thought this was an interested field. It was a difficult
field, actually. I easily found 6166, but the MCG galaxies surrounding it
were tough. I found about seven.
I did a search in NED for the MCG's but it turned up nothing. I did a
search there by "near" NGC 6166, and some data came up. MCG7-34-54 and PGC
058257 came up, showing velocities close to that of NGC 6166. I assume the
other MCG galaxies have similar velocities. This makes me wonder if the
small galaxies are satellites of NGC 6166. Anyone know the answer?
Mark
Received on Tue Oct 4 12:47:48 2005