The Tully-Fisher Relation Provides a Method of Determining Distances to Galaxies

question 176

Multiple Choice

The Tully-Fisher relation provides a method of determining distances to galaxies by estimating the galaxy luminosity from a measurement of which parameter relating to the 21-cm atomic hydrogen radio emission line?

• A) width
• B) position and hence Doppler shift from the rest wavelength
• C) intensity
• D) split between its two components

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