Q&A集でみるX線レーザー : 7. 宇宙におけるX線レーザーの可能性

概要

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The observation of maser emissions from the universe has become a very powerful tool for studying the stellar dynamics, stellar jets, masses of Black Holes at Galactic centers, and so on. Laser emissions are also observed especially in the infrared region and are expected to be active in very massive stars. In the present paper, we would like to consider the physical possibility of x-ray laser astrophysical objects. First, we review the present knowledge relating to masers and lasers in the universe. We then consider lasing in the x-ray region, and briefly review the photo-pumping scheme in laboratories. By focusing on the photo-ionized plasmas observed by "ASCA" and "Chandra" x-ray satellites, we consider the possibility of lasing in the photo-ionized plasmas near Black Hole or Neutron stars. We discuss the important physical processes in such schemes and conclude that it is not yet clear if x-ray lasing is possible without the necessity of performing detailed calculations including those related to radiation transport.
社団法人プラズマ・核融合学会の論文
2001-05-25