The discovery of 13 diffuse interstellar bands with the longest wavelengths to date could someday solve a 90-year-old mystery. Astronomers have identified the new bands using data collected by the ...

Absorption line spectroscopy is a cornerstone technique for probing the gas content, chemical enrichment and kinematics of galaxies in the early universe. By analysing the dark imprints left by ...

Quasars, the most luminous subset of active galactic nuclei (AGN), reveal the interplay between supermassive black holes and their environments through distinctive absorption features imprinted on ...

Various physical mechanisms broaden the intrinsic absorption lines. The most important is that the random motions of the absorbing atoms cause “Doppler broadening.” Larger motions within the object, ...