Jelle de Plaa Irina Zhuravleva, Norbert Werner Eugene Churazov, Jelle Kaastra, Yan Grange Turbulence measurements in two giant elliptical galaxies.

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Presentation transcript:

Jelle de Plaa Irina Zhuravleva, Norbert Werner Eugene Churazov, Jelle Kaastra, Yan Grange Turbulence measurements in two giant elliptical galaxies

Resonant scattering in groups of galaxies NGC 5044 NGC 5813

Chandra unsharp mask images NGC 5044 NGC 5813

Resonance scattering in optically thick lines No turbulenceturbulence

Resonant scattering of Fe XVII lines through RGS

Turbulent velocity and 15A line suppression

Theoretical & measured Fe XVII line ratios Tokamak: Beiersdorfer et al. (2004) / SPEX: Doron & Behar (2002)

Theoretical line ratios Fe XVII (17A/15A) Atomdb 1.0.3: no di-electronic recombination (DR) & radiative recombination (RR) Atomdb 1.0.3: no di-electronic recombination (DR) & radiative recombination (RR) Mekal (Xspec): no DR & RR Mekal (Xspec): no DR & RR Mekal (SPEX): DR & RR included (Doron & Behar 2002) Mekal (SPEX): DR & RR included (Doron & Behar 2002) Atomdb 2.0.1: DR & RR included (calculated internally) Atomdb 2.0.1: DR & RR included (calculated internally)

NGC 5813 & NGC 5044 line ratios SPEX: / Atomdb:

Modeling resonant scattering NGC 5044 NGC 5813 See talk Irina Zhuravleva

Velocity estimates assuming Doron & Behar line ratios ParameterNGC 5044NGC 5813 Sound speed~460 km/s~420 km/s Line width (90% conf) < 775 km/s< 500 km/s Resonant scattering > 230 km/s250 ± 100 km/s Warning: preliminary numbers!

Conclusions Turbulence in NGC 5044 and NGC 5813 constrained Turbulence in NGC 5044 and NGC 5813 constrained NGC 5044: 230 < v turb < 775 km/s NGC 5044: 230 < v turb < 775 km/s NGC 5813: 250 ± 100 km/s NGC 5813: 250 ± 100 km/s Connection to group morphology – sloshing/swirling Connection to group morphology – sloshing/swirling Atomdb 1.0.3: No DR and RR included Atomdb 1.0.3: No DR and RR included Atomdb 2.0.1: Appears to overestimate DR & RR (2 sig. level) Atomdb 2.0.1: Appears to overestimate DR & RR (2 sig. level) Doron & Behar 2002 reasonable estimate (Fe XVII 17/15 A) Doron & Behar 2002 reasonable estimate (Fe XVII 17/15 A)