First detection of an ultra-fast outflow (v≈0.07c) in a quiescent galaxy quenched ~9 Gyr ago, suggesting AGN winds can maintain quiescence independent of global star formation.
The Chandra High Energy Transmission Grating: Design, Fabrication, Ground Calibration and Five Years in Flight
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abstract
Details of the design, fabrication, ground and flight calibration of the High Energy Transmission Grating, HETG, on the Chandra X-ray Observatory are presented after five years of flight experience. Specifics include the theory of phased transmission gratings as applied to the HETG, the Rowland design of the spectrometer, details of the grating fabrication techniques, and the results of ground testing and calibration of the HETG. For nearly six years the HETG has operated essentially as designed, although it has presented some subtle flight calibration effects.
years
2026 2verdicts
CONDITIONAL 2representative citing papers
BLiSS blindly detects, ranks, and optionally identifies emission-line candidates in 1D X-ray spectra via empirical baselines, Gaussian fits, and GMM reliability scores from synthetic null spectra.
citing papers explorer
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First detection of ultra-fast outflows in a quiescent galaxy
First detection of an ultra-fast outflow (v≈0.07c) in a quiescent galaxy quenched ~9 Gyr ago, suggesting AGN winds can maintain quiescence independent of global star formation.
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Blind Line Search System: BLiSS
BLiSS blindly detects, ranks, and optionally identifies emission-line candidates in 1D X-ray spectra via empirical baselines, Gaussian fits, and GMM reliability scores from synthetic null spectra.