Spectroscopy

Spectroscopy is the study of the interaction between matter and electromagnetic radiation. Scientific instruments, such as spectrograph are used in this study, which is an instrument that obtains and records an astronomical spectrum. The spectrograph splits or disperses the light from an object into its component wavelengths so that it can be recorded then analysed. Modern multifibre spectrographs as the 2dF on the AAT allow hundreds of individual spectra from stars or galaxies to be obtained simultaneously.