Iron Line Energy and Equivalent Width of the Galactic Ridge Emission
Abstract
We report on the energy and equivalent width of the iron line as a function of the plasma temperature of the Galactic Ridge emission. The line energies and equivalent widths are systematically lower than those expected from a collisional ionization equilibrium plasma with cosmic abundance. We propose the possibility that the optically thin hot plasma is in a non-equilibrium ionization state with an ionization parameter (nt) of 10(10) --10(11) cm(-3) s, and give some constraints on the physical conditions of the Galactic Ridge plasma.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- August 1995
- Bibcode:
- 1995PASJ...47..439Y
- Keywords:
-
- GALAXIES: MILKY WAY;
- GALAXIES: X-RAYS;
- INTERSTELLAR MEDIUM;
- X-RAYS: SPECTRA