Wavy Stratus under Photon Surfing over Luminous Disks

Details Wavy Stratus under Photon Surfing over Luminous Disks Wavy Stratus under Photon Surfing over Luminous Disks

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55..451f&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.2, pp. 451-459

Astronomy and Astrophysics

Astronomy

2

Accretion, Accretion Disks, Astrophysical Jets, Gamma Rays: Bursts, Instabilities, Radiation

Scientific paper

In a geometrically thin cloud layer under photon surfing over an infinite disk with uniform brightness, a wavy fluctuation automatically amplifies itself.This is a new type of instability for an inhomogeneous stratus moving at a relativistic speed in intense radiation fields.Under radiative flux and drag forces, the equilibrium speed of a wave top can reach ultra-relativistic speed, although the equilibrium speed of a wave base remains in the mildly relativistic regime (˜ 0.45c) due to radiation drag.That is, the equilibrium speed of the wavy stratuswith wavelengthλ becomes 0.99 c (Lorentz factor γ ˜ 10) at height z ˜ 10 λ. As a result, the radiation-drag limit in the astrophysical jets can be broken.The terminal speed, which depends on the strength of radiation fields as well as the wavelength, is also obtained.

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