Biases in hydrostatic mass profiles introduced by hot gas substructures: Chandra study of four galaxy clusters
Abstract
By analyzing the azimuthal variations of total gravitating mass profiles in the central 300 h-171 kpc regions of four galaxy clusters with Chandra data, we find that the azimuthally-averaged mass profiles may have been systematically underestimated by 16+9-8% at 1σ significance in the 50-100 h-171 kpc regions, probably due to the prevailing existence of 2-D hot gas substructures in 100-300 h-171 kpc. The mass biases become negligible (-7+11-9%) at > 150 h-171 kpc. We confirm the results that the gas temperature maps can be used to probe the departure from hydrostatic equilibrium and help quantify the systematic biases in X-ray mass measurements in the central regions of clusters.
- Publication:
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Research in Astronomy and Astrophysics
- Pub Date:
- October 2010
- DOI:
- 10.1088/1674-4527/10/10/004
- Bibcode:
- 2010RAA....10.1005G