X-ray spectroscopy Archives

Red, green and blue represent Chandra X-ray images of O- (0.6–0.85 keV), Si- (1.76–1.94 keV) and Fe-enhanced (6.54–6.92 keV) regions, respectively. The white grids indicate the fields of view of our two-pointing observations with XRISM/Resolve, which has a 6 × 6 pixel array: a pixel at a corner is only used for calibration. Pixels we selected for our spectral analysis are highlighted in yellow. In the south-east (SE) and north (N) regions, we examined the spectrum of each pixel and selected those exhibiting large equivalent widths of K emission; the spatial distribution of these pixels closely matches that of the O and Si emission lines. In contrast, the west (W) region exhibits weak O line intensity, and the K emission line in its spectrum is faint (Fig. 2).-- Nature

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Astrochemistry: Where The Elements Come From

by Keith CowingDecember 4, 2025December 4, 2025

“Why are we here?” is humanity’s most fundamental and persistent question. Tracing the origins of the elements is a direct attempt to answer this at its deepest level. We know […]

Model of the Mars Perseverance rover showing the location of PIXL at the end of the robotic arm.

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Tricorder Tech: A.I. / Machine Learning: Adaptive Sampling With PIXL On Mars Perseverance

by Keith CowingMay 24, 2024May 24, 2024

Editor’s note: From the paper’s Introduction: “At the time of this writing, PIXL’s adaptive sampling capability has been operating on Mars for over 951 sols (martian days), with over 52 […]