| タイトル | A Census of X-ray Gas in NGC 1068: Results From 450 ks of CHANDRA High Energy Transmisson Grating Observations |
| 本文（外部サイト） | http://hdl.handle.net/2060/20140017112 |
| 著者（英） | Kallman, T.; Canizares, C.; Marshall, H.; Schulz, N.; Evans, Daniel A.; Longinotti, A.; Nowak, M. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2013-12-17 |
| 言語 | eng |
| 内容記述 | We present models for the X-ray spectrum of the Seyfert 2 galaxy NGC 1068. These are fitted to data obtained using
the High Energy Transmission Grating on Chandra. The data show line and radiative recombination continuum
emission from a broad range of ions and elements. The models explore the importance of excitation processes for
these lines including photoionization followed by recombination, radiative excitation by absorption of continuum
radiation, and inner shell fluorescence. The models show that the relative importance of these processes depends on
the conditions in the emitting gas and that no single emitting component can fit the entire spectrum. In particular,
the relative importance of radiative excitation and photoionization/recombination differs according to the element
and ion stage emitting the line. This in turn implies a diversity of values for the ionization parameter of the various
components of gas responsible for the emission, ranging from log(E ) = 1 to 3. Using this, we obtain an estimate
for the total amount of gas responsible for the observed emission. The mass flux through the region included in the
HETG extraction region is approximately 0.3M/yr, assuming ordered flow at the speed characterizing the line
widths. This can be compared with what is known about this object from other techniques. |
| NASA分類 | Astrophysics |
| レポートNO | GSFC-E-DAA-TN16127 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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