NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T19:39:19 PDT
Help | Comment | NED Home

For refcode 2011MNRAS.410.1939Z:
Retrieve 12 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2011MNRAS.410.1939Z Strong-lensing analysis of a complete sample of 12 MACS clusters at z > 0.5: mass models and Einstein radii Zitrin, Adi; Broadhurst, Tom; Barkana, Rennan; Rephaeli, Yoel; Benitez, Narciso Abstract. We present the results of a strong-lensing analysis of a complete sample of 12 very luminous X-ray clusters at z > 0.5 using HST/ACS images. Our modelling technique has uncovered some of the largest known critical curves outlined by many accurately predicted sets of multiple images. The distribution of Einstein radii has a median value of ~=28 arcsec (for a source redshift of z_s_~ 2), twice as large as other lower z samples, and extends to 55 arcsec for MACS J0717.5+3745, with an impressive enclosed Einstein mass of 7.4 x 10^14^ M_o_. We find that nine clusters cover a very large area (>2.5 arcmin^2^) of high magnification ({mu} > 10x) for a source redshift of z_s_~ 8, providing primary targets for accessing the first stars and galaxies. We compare our results with theoretical predictions of the standard {LAMBDA} cold dark matter ({LAMBDA}CDM) model which we show systematically fall short of our measured Einstein radii by a factor of ~=1.4, after accounting for the effect of lensing projection. Nevertheless, a revised analysis, once arc redshifts become available, and similar analyses of larger samples, is needed in order to establish more precisely the level of discrepancy with {LAMBDA}CDM predictions. Key words: gravitational lensing: strong, galaxies: clusters: general, galaxies: clusters: individual: MACS z > 0.5 sample, dark matter
Retrieve 12 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home