A High Spectral Resolution Study of the Soft X-Ray Background with the X-Ray Quantum Calorimeter

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A High Spectral Resolution Study of the Soft X-Ray Background with the X-Ray Quantum Calorimeter

Wulf, Dallas; Eckart, Megan E; Galeazzi, Massimiliano; Jaeckel, Felix; Kelley, Richard L; Kilbourne, Caroline A; Morgan, Kelsey M; Porter, F Scott; McCammon, Dan; Szymkowiak, Andrew E

Astrophysical journal/The Astrophysical journal, 10/2019, Volume: 884, Issue: 2

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We present here a combined analysis of four high spectral resolution observations of the Diffuse X-ray Background, made using the University of Wisconsin-Madison/Goddard Space Flight Center X-ray Quantum Calorimeter sounding rocket payload. The observed spectra support the existence of a ∼0.1 keV Local Hot Bubble and a ∼0.2 keV Hot Halo, with discrepancies between repeated observations compatible with expected contributions of time-variable emission from Solar Wind Charge Exchange. An additional component of ∼0.9 keV emission observed only at low galactic latitudes can be consistently explained by unresolved dwarf M stars.

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