Consequences of cluster evolution for the statistics of giant luminous arcs

Details Consequences of cluster evolution for the statistics of giant luminous arcs Consequences of cluster evolution for the statistics of giant luminous arcs

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276....9b&link_type=abstract

Astronomy and Astrophysics, Vol. 276, p. 9 (1993)

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

Richstone et al. (1992) have recently discussed cluster- formation timescales in FLRW universes. They conclude that the epoch of cluster formation is shifted towards small redshifts for {OMEGA}_0_ approaches 1, and together with indications that clusters are "young" entities, they derive a lower limit for{OMEGA}_0_,{OMEGA}_0_ >~ 0.5. If the cluster population is dominated by low-redshift clusters, this should have significant consequences for its lensing capabilities, because lenses close to the observer are inefficient. On the basis of a theoretically derived cluster redshift distribution in an Einstein- deSitter universe, I investigate the optical depth for the formation of large arcs. I find that, on the account of cluster evolution, the optical depth is reduced by a factor of ~5 for moderate- and high-redshift sources relative to the case of non-evolving clusters, and that the mean redshift and the rms width of the redshift distribution of large-arc clusters is significantly lowered.

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