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Astron. Astrophys. 362, 762-773 (2000)

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Cerenkov line-like radiation, the extended and improved formulae system

J.-H. You 1, Y.D. Xu 1, D.B. Liu 1, J.R. Shi 2 and G.X. Jin 1

1 Department of Applied Physics, Shanghai Jiao Tong University, Shanghai, 200030, P.R. China
2 Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, P.R. China

Received 10 September 1998 / Accepted 16 July 2000


You & Cheng (1980) argued that, for relativistic electrons moving through a dense gas, the Cerenkov effect will produce peculiar atomic and/or molecular emission lines-Cerenkov lines. They presented a series of formulae to describe the new line-mechanism. Elegant experimental confirmation has been obtained by Xu. et al. in the laboratory which definitely verified the existence of Cerenkov lines. Owing to the potential importance in high energy astrophysics, in this paper we give a more detailed physical discussion of the emission mechanisms and improve the previous formulae system into a form which is more convenient for astrophysical application. Specifically, the extended formulae in this paper can be applied to other species of atoms and/or ions rather than hydrogen as in the previous paper, and also to X-ray astronomy. They can also be used for the calculation of a nonuniform plane-parallel slab of the emissive gas.

Key words: accretion, accretion disks – line: profiles – X-rays: general

Send offprint requests to: J.-H. You (jhyou@online.sh.cn)

© European Southern Observatory (ESO) 2000

Online publication: October 24, 2000