SIMBAD references

2004ApJ...607..190A - Astrophys. J., 607, 190-201 (2004/May-3)

Complex structure of galaxy cluster A1689: evidence for a merger from X-ray data.


Abstract (from CDS):

A1689 is a galaxy cluster at z=0.183 for which previous measurements of its mass by using various techniques gave discrepant results. We present a new detailed measurement of the mass with the data based on X-ray observations with the European Photon Imaging Camera aboard the XMM-Newton Observatory, determined by using an unparameterized deprojection technique. Fitting the total mass profile to a Navarro-Frenk-White model yields halo concentration c=7.2+1.6–2.4and r200=1.13±0.21h–1Mpc, corresponding to a mass that is less than half of that found from gravitational lensing. Adding to the evidence of substructure from optical observations, X-ray analysis shows a highly asymmetric temperature profile and a nonuniform redshift distribution, implying large-scale relative motion of the gas. A lower than expected gas mass fraction fgas=0.072±0.008 (for a flat ΛCDM cosmology) suggests a complex spatial and/or dynamical structure. We also find no sign of any additional absorbing component previously reported on the basis of the Chandra data, confirming the XMM-Newton low-energy response by using data from ROSAT.

Abstract Copyright:

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Clusters: Individual: Alphanumeric: A1689 - X-Rays: Galaxies: Clusters

Status at CDS:  

Simbad objects: 1

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