Talk:Coma Cluster

Intracluster gas section
The text in this section applies to all galaxy clusters, not just Coma (I work in this field). I suggest it is chopped, as these points are already made in Galaxy cluster. Xioxox 14:08, 15 August 2007 (UTC)

Picture
Most of the objects in the picture above are galaxies; only the very bright objects with diffraction spikes and the smallest circular dots are foreground stars of our own Galaxy. There's no picture in this article. Was there one earlier and it disappeared? Privong 17:21, 14 November 2006 (UTC)
 * According to the edit history, an unreferenced image was deleted by a bot. Maybe the reference to the image should be deleted? GeorgeJBendo 18:26, 14 November 2006 (UTC)
 * Ok. I took care of it. Privong 20:15, 14 November 2006 (UTC)

Requested move
'Move to Coma Cluster. Duja 07:12, 23 October 2006 (UTC)

Coma cluster of galaxies → Coma Cluster — Although "Coma cluster of galaxies" is sometimes accepted elsewhere, "Coma Cluster" is also frequently used and may be preferable for Wikipedia. The object can be considered a proper noun, so it should be written with the first letters of both words capitalized (much like the first letters of "City", "Lake", and "Mountains" are capitalized in "New York City", "Lake Superior", and "Rocky Mountains"}. Previous discussions show support for this convention in naming articles on clusters. GeorgeJBendo 11:52, 16 October 2006 (UTC)

Survey
Add  * Support   or   * Oppose   on a new line followed by a brief explanation, then sign your opinion using ~.


 * Support GeorgeJBendo 11:53, 16 October 2006 (UTC)
 * Support VikÞor |  Talk 19:31, 21 October 2006 (UTC)

Discussion
I notice that Coma Cluster is currently a disambiguation page, pointing both to this article and to coma star cluster. Is the cluster of galaxies a much more common use of "Coma Cluster" than the star cluster? -GTBacchus(talk) 03:30, 21 October 2006 (UTC)


 * I forgot about the Coma star cluster (as do most extragalactic astronomers). The cluster of galaxies is the object most commonly referred to as the "Coma Cluster".  First, searches for "Coma Cluster" on SIMBAD and the NASA/IPAC Extragalactic Database return information on the cluster of galaxies (this article) instead of the open star cluster.  Second, a search for scientific papers with "Coma Cluster" in their title at the ADS Abstract Service reveals that most papers discussing the "Coma Cluster" are referring to the cluster of galaxies.  The star cluster is usually referred to by a different name, such as "Coma Bernices Open Star Cluster" or "Coma Star Cluster".  Third, the top terms in a Google search refer to the cluster of galaxies, not the open star cluster.  Even if I ignore my professional experience, the ADS abstract search shows that most people looking for the "Coma Cluster" will probably be looking for the cluster of galaxies, not the open star cluster.  Naturally, a disambiguation link to the star cluster should be placed at the top of the article. GeorgeJBendo 09:58, 21 October 2006 (UTC)

Galaxy: Exploring the milky way
The newish book Galaxy: Exploring the milky way says the distance from earth is 300 Million LY. Should I put this in? Mocha2007 (talk) 17:48, 3 December 2010 (UTC)

Velocity dispersion VS radial velocity dispersion
Am I correct that the velocity dispersion listed under "observational data" is actually the measured velocity dispersion along the line of sight, i.e. the RMS galaxy velocity along radial direction corrected for net cluster motion, rather than an inferred full 3D velocity dispersion (which I think is ~sqrt(3) times larger)? That seems to be what the source material indicates. 130.237.208.152 (talk) 15:56, 14 October 2015 (UTC)

External links modified
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External links modified (January 2018)
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 * Added archive https://web.archive.org/web/20080530151953/http://imagine.gsfc.nasa.gov/docs/features/objects/coma.html to http://imagine.gsfc.nasa.gov/docs/features/objects/coma.html

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Papers on its collision with the NGC4839 group
https://www.aanda.org/articles/aa/abs/2001/01/aaxmm09/aaxmm09.html and https://arxiv.org/abs/1811.07944 (still at preprint stage).©Geni (talk) 18:44, 22 November 2018 (UTC)