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- W4284969413 abstract "We report high-precision X-ray monitoring observations in the 0.4-10 keV band of the luminous, long-period colliding-wind binary Eta Carinae up to and through its most recent X-ray minimum/periastron passage in February 2020. Eta Carinae reached its observed maximum X-ray flux on 7 January 2020, at a flux level of $3.30 times 10^{-10}$ ergs s$^{-1}$ cm$^{-2}$, followed by a rapid plunge to its observed minimum flux, $0.03 times 10^{-10}$ ergs s$^{-1}$ cm$^{-2}$ near 17 February 2020. The NICER observations show an X-ray recovery from minimum of only $sim$16 days, the shortest X-ray minimum observed so far. We provide new constraints of the deep and shallow minimum intervals. Variations in the characteristic X-ray temperature of the hottest observed X-ray emission indicate that the apex of the wind-wind bow shock enters the companion's wind acceleration zone about 81 days before the start of the X-ray minimum. There is a step-like increase in column density just before the X-ray minimum, probably associated with the presence of dense clumps near the shock apex. During recovery and after, the column density shows a smooth decline, which agrees with previous $N_{H}$ measurements made by SWIFT at the same orbital phase, indicating that changes in mass-loss rate are only a few percent over the two cycles. Finally, we use the variations in the X-ray flux of the outer ejecta seen by NICER to derive a kinetic X-ray luminosity of the ejecta of $sim 10^{41}$ ergs s$^{-1}$ near the time of the Great Eruption'." @default.
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- W4284969413 date "2022-07-01" @default.
- W4284969413 modified "2023-10-06" @default.
- W4284969413 title "NICER X-Ray Observations of Eta Carinae during Its Most Recent Periastron Passage" @default.
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- W4284969413 doi "https://doi.org/10.3847/1538-4357/ac69ce" @default.
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