Chandra Temperature Map of Abell 754 and Constraints on Thermal Conduction

Details Chandra Temperature Map of Abell 754 and Constraints on Thermal Conduction Chandra Temperature Map of Abell 754 and Constraints on Thermal Conduction

2003-01-17

arxiv.org/abs/astro-ph/0301367v2

Astrophys.J. 586 (2003) L19-L24

Astronomy and Astrophysics

Astrophysics

Discussion of relevance of our conduction constraint for cooling flows expanded. 4 pages (using the new emulateapj), color fig

Scientific paper

10.1086/374656

We use Chandra data to derive a detailed gas temperature map of the nearby, hot, merging galaxy cluster A754. Combined with the X-ray and optical images, the map reveals a more complex merger geometry than previously thought, possibly involving more than two subclusters or a cool gas cloud sloshing independently from its former host subcluster. In the cluster central region, we detect spatial variations of the gas temperature on all linear scales, from 100 kpc (the map resolution) and up, which likely remain from a merger shock passage. These variations are used to derive an upper limit on effective thermal conductivity on a 100 kpc scale, which is at least an order of magnitude lower than the Spitzer value. This constraint pertains to the bulk of the intracluster gas, as compared to the previously reported estimates for cold fronts (which are rather peculiar sites). If the conductivity in a tangled magnetic field is at the recently predicted higher values (i.e., about 1/5 of the Spitzer value), the observed suppression can be achieved, for example, if the intracluster gas consists of magnetically isolated domains.

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