MgII emission line
like a secret password that lets them into the secret party
Technical definition
a narrow spectral line emitted by an ionized magnesium atom, commonly used as a diagnostic tool for detecting Active Galactic Nuclei (AGNs).
like a secret password that lets them into the secret party
a narrow spectral line emitted by an ionized magnesium atom, commonly used as a diagnostic tool for detecting Active Galactic Nuclei (AGNs).