XMM-Newton EPIC and OM observation of Nova Centauri 1986 (V842 Cen)
G. J. M. Luna (IAFE/Conicet), M. P. Diaz (IAG), N. S. Brickhouse, (CfA), M. Moraes (IAG)

TL;DR
This study analyzes XMM-Newton observations of Nova Centauri 1986, revealing a periodicity likely linked to a magnetically-channelled accretion flow and characterizing its X-ray spectrum with a high-temperature plasma model.
Contribution
First detailed X-ray spectral and timing analysis of Nova Centauri 1986 using XMM-Newton data, identifying a significant periodicity and plasma temperature.
Findings
Detected a 3.51-hour period in X-ray data.
X-ray spectrum fits an absorbed thin thermal plasma model.
Maximum plasma temperature around 43 keV.
Abstract
We report the results from the temporal and spectral analysis of an XMM-Newton observation of Nova Centauri 1986 (V842 Cen). We detect a period at 3.510.4 h in the EPIC data and at 4.00.8 h in the OM data. The X-ray spectrum is consistent with the emission from an absorbed thin thermal plasma with a temperature distribution given by an isobaric cooling flow. The maximum temperature of the cooling flow model is keV. Such a high temperature can be reached in a shocked region and, given the periodicity detected, most likely arises in a magnetically-channelled accretion flow characteristic of intermediate polars. The pulsed fraction of the 3.51 h modulation decreases with energy as observed in the X-ray light curves of magnetic CVs, possibly due either to occultation of the accretion column by the white dwarf body or phase-dependent to absorption. We do…
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