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Fast spectral fitting of hard X-ray bremsstrahlung from truncated power-law electron spectra
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SYSNO ASEP 0315351 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fast spectral fitting of hard X-ray bremsstrahlung from truncated power-law electron spectra Title Rychlé spektrální fitování tvrdého rentgenového záření emitovaného mocninnými elektronovými spektry Author(s) Brown, J. C. (GB)
Kašparová, Jana (ASU-R) RID, ORCID
Massone, A.M. (IT)
Piana, M. (IT)Source Title Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 486, č. 3 (2008), s. 1023-1029Number of pages 7 s. Language eng - English Country FR - France Keywords sun flares ; X-rays ; gamma rays Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects GP205/06/P135 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10030501 - ASU-R (2005-2011) UT WOS 000258326500044 DOI 10.1051/0004-6361:200809496 Annotation Various approximate relations between electron and photon spectral indices are often used for energies both above and below electron low-energy cutoffs. We examine the form of the exact relationships and show that empirical approximations can be highly misleading especially at energies below the low-energy cutoff. We obtain simple analytical expressions for photon spectra from truncated power-law electron spectra for the non-relativistic Bethe-Heitler case and commonly used models. We show that below the low-energy cutoff constant spectral index forms are very poor approximations to accurate results, but that our analytical forms are a good match. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2009
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