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| Paper: |
X-ray Iron Line Emission From Sagittarius A* |
| Volume: |
439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies |
| Page: |
434 |
| Authors: |
Ji, L.; Baganoff, F. K.; Dong, H.; Yuan, F. |
| Abstract: |
The line features between [6, 7] keV contain the critical information about
the physical origin of the steady X-ray emission from Sagittarius A* and its vicinity.
The observations by Baganoff et al. (2003) show that the line center detected outside of
Bondi radius is about 6.5+0.1–0.2 keV, which indicates that the
iron ions are not in a collisional ionization equilibrium (CIE).
Indeed current models assume CIE and hence
predict that iron ions are dominated by H and He-like ions with the line center
being close to 6.7 keV.
New spectral data from about 1 Ms of Chandra ACIS observations
allow us to better constrain iron line features, which offers a good indicator to discriminate
different models.
We aim to examine non-equilibrium ionization (NEI) effects
for Sgr A* and its vicinity using the various dynamic models based on the NEI code by Ji et al. (2006). Our preliminary results for the vicinity of Sgr A* show that the center of
Fe ion features
is 6.48+0.01–0.02 keV and σ = 87.2+1.5–1.7 eV. |
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