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Some relatively massive spiral galaxies in the Virgo cluster have narrow HI spectra. How can galaxy...

Some relatively massive spiral galaxies in the Virgo cluster have narrow HI spectra. How can galaxy orientation impact the observed HI velocity width W50?

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Answer #1

The general HI spectra, that is known as 21cm Hyperfine Hydrogen line spectrum. It is used to compute the galactic rotational curves, masses etc.

The galaxy orientation can change the frequency of the HI spectra due to doppler shift incoming HI 21cm radiation through the space-time curvature, the observe HI velocity width W50, will be narrower if the orientation of the galaxy resulted in the increase of mean distance between Earth (observer) and the galaxy, otherwise the width would be broader.

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