Jelle de Plaa Jelle de Plaa

Irina Zhuravleva, Norbert Werner Irina Zhuravleva, Norbert Werner

Eugene Churazov, Jelle Kaastra, Yan GrangeEugene Churazov, Jelle Kaastra, Yan Grange

Turbulence measurements in two Turbulence measurements in two giant elliptical galaxiesgiant elliptical galaxies

Resonant scattering in groups of galaxiesResonant scattering in groups of galaxies

NGC 5044NGC 5044 NGC 5813NGC 5813

Chandra unsharp mask imagesChandra unsharp mask images

NGC 5044NGC 5044 NGC 5813NGC 5813

Resonance scattering in optically thick linesResonance scattering in optically thick lines

No turbulence turbulence

Resonant scattering of Fe XVII lines through RGS Resonant scattering of Fe XVII lines through RGS

Turbulent velocity and 15A line suppressionTurbulent velocity and 15A line suppression

Theoretical & measured Fe XVII line ratiosTheoretical & measured Fe XVII line ratios

Tokamak: Beiersdorfer et al. (2004) / SPEX: Doron & Behar (2002)

Theoretical line ratios Fe XVII (17A/15A)Theoretical line ratios Fe XVII (17A/15A)

• Atomdb 1.0.3Atomdb 1.0.3: no di-electronic recombination (DR) & radiative : no di-electronic recombination (DR) & radiative recombination (RR)recombination (RR)

• Mekal (Xspec)Mekal (Xspec): no DR & RR: no DR & RR

• Mekal (SPEX)Mekal (SPEX): DR & RR included (Doron & Behar 2002): DR & RR included (Doron & Behar 2002)

• Atomdb 2.0.1Atomdb 2.0.1: DR & RR included (calculated internally): DR & RR included (calculated internally)

NGC 5813 & NGC 5044 line ratiosNGC 5813 & NGC 5044 line ratios

SPEX: www.sron.nl/spex / Atomdb: www.atomdb.org

Modeling resonant scatteringModeling resonant scattering

NGC 5044NGC 5044 NGC 5813NGC 5813

See talk Irina Zhuravleva

Velocity estimates Velocity estimates assuming Doron & Behar line ratiosassuming Doron & Behar line ratios

Parameter NGC 5044 NGC 5813

Sound speed ~460 km/s ~420 km/s

Line width(90% conf)

< 775 km/s < 500 km/s

Resonant scattering

> 230 km/s 250 ± 100 km/s

Warning: preliminary numbers!

ConclusionsConclusions

• Turbulence in NGC 5044 and NGC 5813 constrained Turbulence in NGC 5044 and NGC 5813 constrained • NGC 5044: 230 < vNGC 5044: 230 < vturbturb < 775 km/s < 775 km/s

• NGC 5813: 250 ± 100 km/sNGC 5813: 250 ± 100 km/s• Connection to group morphology – sloshing/swirlingConnection to group morphology – sloshing/swirling

• Atomdb 1.0.3: No DR and RR includedAtomdb 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)