The width of the Нр line in the spectrum of the nucleus of the Seyfert galaxy is about 3 nm. How can we estimate

The width of the Нр line in the spectrum of the nucleus of the Seyfert galaxy is about 3 nm. How can we estimate the activity of the galaxy from this value?

The broadening of the line is caused by the spread in the velocities of the particles of the emitting gas. According to the formula of the Doppler effect, the speed of the clouds is within ± 1000 km / s.

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