XMM-Newton observations of the dwarf nova YZ Cnc in quiescenceReportar como inadecuado



 XMM-Newton observations of the dwarf nova YZ Cnc in quiescence


XMM-Newton observations of the dwarf nova YZ Cnc in quiescence - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Descargar gratis o leer online en formato PDF el libro: XMM-Newton observations of the dwarf nova YZ Cnc in quiescence
We present results from the XMM observations of the dwarf nova YZ Cnc in a quiescent state. We have performed a detailed time series analysis of the resulting light curves. Unusually, we do not detect any orbital modulation in the UV, with only marginal evidence for X-ray modulation on this period. Although there are peaks in the X-ray periodograms at periods less than 5000 s, we attribute them to red noise effects and assign significance to them using a novel approach. The variability in the UV and optical bands can also be modelled as a result of aperiodic variability red noise in the system. There is evidence that the UV and X-ray fluxes are anti-correlated with a time delay of about 100 s, with the UV lagging behind the X-ray emission. This anti-correlation is intriguing, but is only present on two occasions lasting several 1000 s each. The X-ray spectrum shows similar emission features to other dwarf novae and is well fitted using a multi-temperature emission model. We measure a relatively high X-ray luminosity of ~1.4x10^{32} ergs-s, although this is consistent with a low binary inclination. Finally, we find evidence for a possible -1200km-s blue shift in the fitted Fe K line energies, possibly indicating the presence of an outflow in this low inclination system.



Autor: Pasi Hakala; Gavin Ramsay; Peter Wheatley; Emilios Harlaftis; C. Papadimitriou

Fuente: https://archive.org/







Documentos relacionados