A Broadband Search for Coherent Radio Emission in Cataclysmic Variables

Le résumé fourni par la source

Abstract Radio observations of cataclysmic variables have revealed a variety of behaviors. From some systems, we see bright unpolarized radio flares occurring during dwarf nova outbursts, consistent with synchrotron emission from jets. In others, we see highly polarized emission, restricted in frequency, superimposed on a flat-spectrum continuum, suggesting a coherent emission process. Here, we present spectrotemporal analysis of 2–4 GHz and 8–12 GHz Very Large Array observations of six cataclysmic variables. Our results show both broad- and narrowband, highly polarized, variable radio emission. We suggest that this emission is consistent with electron–cyclotron maser emission or plasma radiation. This could be from an isolated emission region in the case of the narrowband emission, or a region with varying magnetic field strength or density in the case of the broadband emission. In one target, V2400 Oph, we see largely unpolarized emission changing on minute timescales, which may coincide with interactions between the white dwarf’s magnetosphere and diamagnetic blobs.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.