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Turbulence measurements in two giant elliptical galaxies

Turbulence measurements in two giant elliptical galaxies. Jelle de Plaa Irina Zhuravleva, Norbert Werner Eugene Churazov, Jelle Kaastra, Yan Grange. Resonant scattering in groups of galaxies. NGC 5044. NGC 5813. Chandra unsharp mask images. NGC 5044 . NGC 5813.

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Turbulence measurements in two giant elliptical galaxies

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

  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 turbulence turbulence

  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) • Mekal (Xspec): no DR & RR • Mekal (SPEX): DR & RR included (Doron & Behar 2002) • Atomdb 2.0.1: DR & RR included (calculated internally)

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

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

  11. Velocity estimates assuming Doron & Behar line ratios Warning: preliminary numbers!

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

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