Talk:Globular cluster

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Radii wrong ??[edit]

Quote: "Almost all globular clusters have a half-light radius of less than 10 pc, although there are well-established globular clusters with very large radii (i.e. NGC 2419 (Rh = 18 pc) and Palomar 14 (Rh = 25 pc))"

According to Figure 2.24 of Galaxy Formation & Evolution by Mo, Bosch, White; NGC2419 has the physical properties (radius, luminosity) of an Ultra-Compact Dwarf (UCD) super-globular-cluster; whereas, Palomar 14 has the physical properties of a dim Dwarf Spheroidal (dSph), similar to Willman 1 or Segue 1. (talk) 13:52, 14 January 2014 (UTC)

on second thought, Palomar 14's position, in the overall parameter-space including Luminosity, Radius (half-light), and also Mass, is allot less unlike common GCs, vs. dSph sub-galaxies. Prima facie, Palomar 14 is a low-mass GC, which "ought" to be a few light-years across, but which has been tidally distorted & distended, stretched to ten times that size, by some kind of comparatively close encounter, with another massive object. The current article does not seem to be wrong, to classify Palomar 14 as a GC (although any implication, that Palomar 14 is a large-and-also-bright-and-massive super-GC, akin to NGC 2419, is "wildly" inaccurate). (talk) 10:43, 15 January 2014 (UTC)

More sources needed in Globular_cluster#Radii[edit]

I've added a refimprove tag since all the definitions stated in that section (ie: core radius, half-light radius, tidal radius, half-mass radius) are unsourced. Anybody has perhaps a text book to source this? Regards. Gaba (talk) 22:45, 25 March 2014 (UTC)