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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 on theme: "Jelle de Plaa Irina Zhuravleva, Norbert Werner Eugene Churazov, Jelle Kaastra, Yan Grange Turbulence measurements in two giant elliptical galaxies."— Presentation transcript:

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

2 Resonant scattering in groups of galaxies NGC 5044 NGC 5813

3 Chandra unsharp mask images NGC 5044 NGC 5813

4 Resonance scattering in optically thick lines No turbulenceturbulence

5 Resonant scattering of Fe XVII lines through RGS

6 Turbulent velocity and 15A line suppression

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

8 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)

9 NGC 5813 & NGC 5044 line ratios SPEX: www.sron.nl/spex / Atomdb: www.atomdb.orgwww.sron.nl/spexwww.atomdb.org

10 Modeling resonant scattering NGC 5044 NGC 5813 See talk Irina Zhuravleva

11 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!

12 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)

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