Pure cyclotron spectra of V405 Aur |
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| Institution: | 1. Space Research Institute, Profsoyuznaya 84/32, 117997 Moscow, Russia;2. National Research University Higher School of Economics, Myasnitskaya ul. 20, 101000 Moscow, Russia;3. INAF-IASF, via Alfonso Corti 12, I-20133 Milano, Italy;4. INAF-IAPS, via Fosso del Cavaliere, 00133 Roma, Italy;5. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany;6. Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, Universitetskij pr. 13, 119234 Moscow, Russia;7. ESA/ESAC, 28691 Villanueva de la Cañada, Madrid, Spain;8. University of Southampton, United Kingdom;9. University of Geneva, Department of Astronomy, Chemin d’Ecogia 16, 1290, Versoix, Switzerland;10. DTU Space, National Space Institute, Technical University of Denmark, Elektrovej 328, DK-2800 Lyngby, Denmark;11. INAF-IASF Palermo, Via U. La Malfa 153, I-90146 Palermo, Italy;12. International Space Science Institute, Hallerstrasse 6, CH-3012 Bern, Switzerland;13. INAF, Osservatorio di Astrofisica e Scienza dello Spazio, via Gobetti 101, I-40129 Bologna, Italy;14. ESA/ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands;15. Liceo Scientifico F. Enriques, via F. Paolini, 196, I-00122, Ostia (Rome), Italy;p. Dr. Karl Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049, Bamberg, Germany |
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| Abstract: | In this study we investigate the pure cyclotron spectra of an Intermediate Polar (IP), V405 Aur, which has the highest magnetic field strength in its class. Recent studies have shown that cyclotron harmonics are seen in the spectra of V405 Aur. We assume that cyclotron harmonics are produced by electrons having a streaming bi-Maxwellian velocity profile found in the lower portions of the accretion column connecting to the magnetic poles of the white dwarf in V405 Aur system. Then we applied the Green function for a dispersive medium such as the one found in V405 Aur. Further we assume that the cyclotron radiation is produced at Ordinary and Extraordinary wave modes. We find the general solution of the Green function for the Extraordinary wave mode and a dispersive medium and we derived the pure cyclotron spectra from the Green function. This function enabled us to calculate energy radiated per unit wavelength per unit solid angle as a function of wavelength which revealed the sixth, seventh and the eighth harmonics which correspond to the observed values. Our model produces the observed cyclotron spectrum of V405 Aur. |
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