Recent studies have made significant advancements in the understanding of X-ray emission spectra, particularly focusing on the Kα and Kβ lines of elements like copper and scandium. For instance ...
We assembled high signal-to-noise ratio (S/N) composite spectra of a sequence of these AGN defined by the ionization level of their narrow-line regions (NLR), and extending down to very low ionization ...
While the Microwave Window is a “cosmic quiet zone” the existence of the radio emission lines marking the Water Hole illustrates a problem ... frequencies. The resulting spectrum (power vs. frequency) ...