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The Surface Density Profiles and Lensing Characteristics of Hickson's Compact Groups of Galaxies | M. L. Montoya
; R. Dominguez-Tenreiro
; G. Gonzalez-Casado
; G. A. Mamon
; E. Salvador-Sole
; | Date: |
17 Oct 1996 | Journal: | Astrophys.J. 473 (1996) L83 | Subject: | astro-ph | Abstract: | A statistical method is developed to infer the typical density profiles of poor galaxy systems without resort to binning of data or assuming a given center to each system. The method is applied to the accordant redshift quartets in Hickson’s compact groups (HCGs). The distribution of separations in these groups is consistent with a unique generalized modified Hubble surface density profile, with best-fit asymptotic slope beta = 1.4 and core radius R_c = 18 h^{-1} kpc, although a King profile (beta = 1) is also consistent with the data (with R_c = 6 h^{-1} kpc). These distributions are more concentrated than what has been previously determined for these groups. HCGs are unlikely to act as strong gravitational lenses, but analogous systems 5 to 10 times more distant should produce a non-negligible fraction of giant arcs. | Source: | arXiv, astro-ph/9610138 | Services: | Forum | Review | PDF | Favorites |
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