100 km s¹. Calculate the ruling density necessary to observe the Hydrogen- 3 emission line at the same resolution, if the observations are taken in first order and in 1-arcsecond seeing.
100 km s¹. Calculate the ruling density necessary to observe the Hydrogen- 3 emission line at the same resolution, if the observations are taken in first order and in 1-arcsecond seeing.
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Transcribed Image Text:There are several spectral features that can be used to characterise galax-
ies, including the Hydrogen-a emission at 656.3 nm and the Hydrogen-
emission at 486.8 nm.
For the Hydrogen-a emission, the spectrograph on the FET just gives
sufficient resolution to resolve the emission line, which has a width of
100 km s¹. Calculate the ruling density necessary to observe the Hydrogen-
ß emission line at the same resolution, if the observations are taken in first
order and in 1-arcsecond seeing.
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