Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Ardavan, Houshang"'
Autor:
Ardavan, Houshang
Publikováno v:
MNRAS 534, 4050-4059 (2024)
By applying the Efron-Petrosian method to the fluxes $S$ and distances $D$ of the magnetars listed in the Magnetar Outburst Online Catalogue, we show that the observational data are consistent with the dependence $S\propto D^{-3/2}$, which characteri
Externí odkaz:
http://arxiv.org/abs/2410.08236
Autor:
Ardavan, Houshang
Publikováno v:
Mon. Not. R. Astron. Soc. 529, 3744-3750 (2024)
In their catalogue of pulsars' radio spectra, Swainston et al. (2022, PASA, 39, e056) distinguish between five different forms of these spectra: those that can be fitted with (i) a simple power law, (ii) a broken power law, (iii) a low-frequency turn
Externí odkaz:
http://arxiv.org/abs/2402.09913
Autor:
Ardavan, Houshang
Publikováno v:
Journal of Cosmology and Astroparticle Physics 05 (2024) 067
We show that the spectral energy distribution (SED) of the tightly focused radiation generated by the superluminally moving current sheet in the magnetosphere of a non-aligned neutron star fits the gamma-ray spectra of the Crab, Vela and Geminga puls
Externí odkaz:
http://arxiv.org/abs/2312.03471
Autor:
Ardavan, Houshang
Publikováno v:
Journal of High Energy Astrophysics 37 (2023) 62-70
The prevalent view that the radio-loud gamma-ray pulsars have gamma-ray luminosities that exceed their radio luminosities by several orders of magnitude is based on the assumption that the decay with distance of their gamma-ray fluxes obeys the inver
Externí odkaz:
http://arxiv.org/abs/2212.01305
Autor:
Ardavan, Houshang
Publikováno v:
A&A 672, A154 (2023)
The spectrum derived here for the most tightly-focused component of the radiation generated by the superluminally moving current sheet in the magnetrosphere of a non-aligned neutron star has a distribution function that fits the entire gamma-ray spec
Externí odkaz:
http://arxiv.org/abs/2211.14901
Autor:
Ardavan, Houshang
Results of the mathematical treatment of the radiation by the superluminally moving current sheet in the magnetosphere of a neutron star, which was presented in Ardavan (2021, {\it MNRAS}, {\bf 507}, 4530), are explained here in more transparent phys
Externí odkaz:
http://arxiv.org/abs/2206.02729
Autor:
Ardavan, Houshang
The prevailing view that magnetars' X-ray luminosities exceed their spin-down luminosities is based on the assumption that the decay with distance of the flux of the X-rays received from magnetars obeys the inverse-square law. The results presented h
Externí odkaz:
http://arxiv.org/abs/2202.05162
Autor:
Ardavan, Houshang
Pulsars' gamma-ray luminosities are thought to exceed their radio luminosities by several orders of magnitude: a notion that is based on the assumption that the decay with distance of the flux of gamma-ray pulses obeys the inverse-square law as does
Externí odkaz:
http://arxiv.org/abs/2201.09256
Autor:
Ardavan, Houshang
Publikováno v:
MNRAS 507, 4530-4563 (2021)
The mechanism by which the radiation received from obliquely rotating neutron stars is generated remains an open question half a century after the discovery of pulsars. In contrast, considerable progress has recently been made in determining the stru
Externí odkaz:
http://arxiv.org/abs/2104.06126
Autor:
Ardavan, Houshang
Publikováno v:
Journal of Plasma Physics, 2019, vol. 85, 905850304
I analyse and numerically evaluate the radiation field generated by an experimentally realized embodiment of an electric polarization current whose rotating distribution pattern moves with linear speeds exceeding the speed of light in vacuum. I find
Externí odkaz:
http://arxiv.org/abs/1907.10715