Astronomy and Astrophysics, volume 594A, 121-121 (2016/10-1)
The Bullet cluster at its best: weighing stars, gas, and dark matter.
PARAFICZ D., KNEIB J.-P., RICHARD J., MORANDI A., LIMOUSIN M., JULLO E. and MARTINEZ J.
Abstract (from CDS):
Aims. We present a new strong lensing mass reconstruction of the Bullet cluster (1E 0657-56) at z=0.296, based on WFC3 and ACS HST imaging and VLT/FORS2 spectroscopy. The strong lensing constraints underwent substantial revision compared to previously published analysis, there are now 14 (six new and eight previously known) multiply-imaged systems, of which three have spectroscopically confirmed redshifts (including one newly measured from this work).
Methods. The reconstructed mass distribution explicitly included the combination of three mass components: (i) the intra-cluster gas mass derived from X-ray observation; (ii) the cluster galaxies modeled by their fundamental plane scaling relations and (iii) dark matter.
Results. The model that includes the intra-cluster gas is the one with the best Bayesian evidence. This model has a total rms value of 0.158'' between the predicted and measured image positions for the 14 multiple images considered. The proximity of the total rms to resolution of HST/WFC3 and ACS (0.07-0.15''FWHM) demonstrates the excellent precision of our mass model. The derived mass model confirms the spatial offset between the X-ray gas and dark matter peaks. The fraction of the galaxy halos mass to total mass is found to be fs=11±5% for a total mass of 2.5±0.1x1014M☉ within a 250kpc radial aperture.
© ESO, 2016
gravitational lensing: strong - galaxies: clusters: individual: Bullet cluster
Status at CDS
Examining the need for a new acronym.
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