When We Measure the Broadening of Absorption Lines in the Spectrum

question 51

Multiple Choice

When we measure the broadening of absorption lines in the spectrum of an elliptical galaxy, we can infer

• A) the galaxy's rotation curve.
• B) the amount of gas and dust in the galaxy.
• C) how fast the stars in the galaxy are moving relative to one another.
• D) how quickly the galaxy is forming new stars.
• E) the mass of the black hole at the galaxy's center.

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