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

question 82

Multiple Choice

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

• A) Its position and Doppler shift
• B) The split between its two components
• C) Its width
• D) Its intensity

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