Long-slit spectroscopy

Observation through a long slit allows simultaneously taking spectrographs of all parts of the objects which fall onto the slit. When observing spectral lines, different Doppler shifts can be observed along a given spectral line, leading to velocity profiles of the object along the slit.

In astronomy, long-slit spectroscopy involves observing a celestial object using a spectrograph in which the entrance aperture is an elongated, narrow slit. Light entering the slit is then refracted using a prism, diffraction grating, or grism. The dispersed light is typically recorded on a charge-coupled device detector.[1]

  1. ^ Sloan, Gregory C. (December 20, 2007). "Long-slit spectroscopy" (Website). Retrieved August 7, 2011.