Journal
ASTROPHYSICAL JOURNAL
Volume 693, Issue 2, Pages 1570-1578Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/693/2/1570
Keywords
galaxies: clusters: individual (Abell 1689); gravitational lensing; X-rays: galaxies: clusters
Categories
Funding
- Danish National Research Foundation
- Instrument Center for Danish Astrophysics
- Agence Nationale de la Recherche (France) [06-BLAN-0067]
- Research Council of Norway
Ask authors/readers for more resources
There is a long-standing discrepancy between galaxy cluster masses determined from X-ray and gravitational lensing observations of which Abell 1689 is a well studied example. In this work, we take advantage of 180 ks of Chandra Xray observations and a new weak gravitational study based on a Hubble Space Telescope mosaic covering the central 1.8 Mpc x 1.4 Mpc to eliminate the mass discrepancy. In contrast to earlier X-ray analyses where the very circular surface brightness has been inferred as Abell 1689 being spherically symmetric and in hydrostatic equilibrium, a hardness ratio map analysis reveals a regular and symmetric appearing main clump with a cool core plus some substructure in the northeastern part of the cluster. The gravitational lensing mass model supports the interpretation of Abell 1689 being composed of a main clump, which is possibly a virialized cluster, plus some substructure. In order to avoid complications and misinterpretations due to X-ray emission from the substructure, we exclude it from the mass reconstruction. Comparing X-ray and lensing mass profiles of the regular main part only, shows no significant discrepancy between the two methods and the obtained mass profiles are consistent over the full range where the mass can be reconstructed from X-rays (out to approximate to 1 Mpc). The obtained cluster mass within approximate to 875 kpc derived from X-rays alone is (6.4 +/- 2.1) x 10(14) M-circle dot compared to a weak lensing mass of (8.6 +/- 3.0) x 10(14) M-circle dot within the same radius.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available