Redshift Asymmetry as an Indication of Dark Energy around Groups of Galaxies

Details Redshift Asymmetry as an Indication of Dark Energy around Groups of Galaxies Redshift Asymmetry as an Indication of Dark Energy around Groups of Galaxies

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dda....39.0103v&link_type=abstract

American Astronomical Society, DDA meeting #39, #1.03

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Scientific paper

Einstein's lambda-term or the dark energy creates regions of cool galaxy expansion flows outside the virialized group beyond the zero-gravity sphere [1]. It has been demonstrated [2] that the flows identified as expanding population around galaxy groups may show redshift asymmetries. The corresponding asymmetries are found also in observed galaxy group samples [3,4]. We use the HST observations of the environments of the Local Group of galaxies and of two other groups to demonstrate that the cool outflow regions do exist around galaxy groups on the spatial scales of a few Mpc. Then we use numerical simulations of lambda-dominated cosmological models to show that groups of galaxies indeed should possess expanding populations which reveal redshift asymmetries when viewed from outside at a reasonably close distance. Thus the observation of "anomalous redshifts" in 1970 proved highly significant in the case of groups of galaxies, and it pointed to the existence of dark energy even though it took many decades to fully understand the implications.
References: 1. Chernin et al. 2007, A&A 467,933; 2. Byrd & Valtonen 1985, ApJ 289,535; 3. Arp 1970, Nature 225, 103; 4. Sulentic 1984, ApJ 286, 442.

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