X-ray spectroscopy (PDF) - SRON
X-ray spectroscopy (PDF) - SRON
X-ray spectroscopy (PDF) - SRON
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Results<br />
Fe XVII spectrum Capella<br />
(Bernitt et al. 2012)<br />
• NGC 5813:<br />
v turb = 140-540 km/s<br />
(15-45% of pressure)<br />
• NGC 5044:<br />
v turb >320 km/s<br />
(> 40% turbulence)<br />
16.78,<br />
17.06,<br />
17.10 Å<br />
15.27 Å<br />
15.01 Å<br />
85<br />
86<br />
• 3C: 2p 61 S 0 –2p 5 3d 1 P 1<br />
(resonane)<br />
• 3D: 2p 61 S 0 –2p 5 3d 3 D 1<br />
(forbidden)<br />
• Forbidden line occurs due<br />
to mixing<br />
• Excite Fe XVII using laser<br />
• Allows to measure<br />
individual oscillator<br />
strengths<br />
3C/3D lines<br />
(Bernitt et al. 2012)<br />
Resulting oscillator strength<br />
• Observed ratio of<br />
oscillator strengths<br />
71% smaller than<br />
e.g. NIST value<br />
and others<br />
• If due to 3C line,<br />
than also in<br />
emission lower<br />
fluxes!<br />
87<br />
88<br />
Groups revisited<br />
Absorption spectra<br />
• Implications Bernitt et al.:<br />
model X/3C 40% higher<br />
• Resonance scattering<br />
makes observed X/3C<br />
higher<br />
• Source like NGC 5044<br />
would fall below line!<br />
• Should full effect be<br />
attributed to 3C alone? Or<br />
also to 3D?<br />
89 90
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