Chandra Observations of the Lensing Cluster EMSS 1358+6245: Implications for Self-Interacting Dark Matter
We present Chandra observations of EMSS 1358+6245, a relaxed cooling flow cluster of galaxies at z = 0.328. We employ a new deprojection technique to construct temperature, gas, and dark matter profiles. We confirm the presence of cool gas in the cluster core, and our deprojected temperature profile...
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Zusammenfassung: | We present Chandra observations of EMSS 1358+6245, a relaxed cooling flow
cluster of galaxies at z = 0.328. We employ a new deprojection technique to
construct temperature, gas, and dark matter profiles. We confirm the presence
of cool gas in the cluster core, and our deprojected temperature profile for
the hot component is isothermal over 30 kpc < r < 0.8 Mpc. Fitting the mass
profile to an NFW model yields r_s = 153 [+161,-83] kpc and c = 8.4
[+3.4,-2.3]. We find good agreement between our dark matter profile and weak
gravitational lensing measurements. We place an upper limit of 42 kpc (90%
confidence limit) on the size of any constant density core. We compare this
result to recent simulations and place a conservative upper limit on the dark
matter particle scattering cross section of 0.1 cm^2/g. This limit implies that
the cross-section must be velocity dependent if the relatively shallow core
mass profiles of dwarf galaxies are a direct result of dark matter
self-interaction. |
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DOI: | 10.48550/arxiv.astro-ph/0109141 |