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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28310
Title: Cross section of curvature radiation absorption
Authors: LOCATELLI, NICOLA
GHISELLINI, Gabriele 
Issue Date: 2018
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 617
First Page: A84
Abstract: When treating the absorption of light, it is instructive to focus on the absorption coefficient related to the probability of photons to survive while traversing a layer of material. From the point of view of particles doing the absorption, however, the elementary interaction of the particle with the photon is best described by the corresponding cross section. We revisit curvature radiation in order to find the absorption cross section for this process, making use of the Einstein coefficients and their relations with spontaneous and stimulated emission and true absorption. We derive the cross section as a function of the emission angle ψ (i.e. the angle between the instantaneous velocity vector and the direction of the photon) and the cross section integrated over angles. Both are positive, contrary to the synchrotron case for which the cross section can be negative for large ψ. Therefore, it is impossible to have curvature radiation masers. This has important consequences for sources of very large brightness temperatures that require a coherent emission process, such as pulsars and fast radio bursts.
URI: http://hdl.handle.net/20.500.12386/28310
URL: https://www.aanda.org/articles/aa/abs/2018/09/aa31822-17/aa31822-17.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201731822
Bibcode ADS: 2018A&A...617A..84L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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