The Hubble Space Telescope Has Enabled Astronomers to Explore an Active

question 12

Multiple Choice

The Hubble Space Telescope has enabled astronomers to explore an active galaxy such as M87 in remarkable detail. Which of the following observations of M87 is NOT an important part of the web of evidence that shows it must have a supermassive black hole at the center?

• A) the discovery of a gravitational lens in M87
• B) the discovery that the distribution of stars in the galaxy becomes densely concentrated at the center (much more so than in normal elliptical galaxies)
• C) the discovery of an inner disk of rapidly swirling gas in the center of the galaxy
• D) the Doppler shifts measured for spectral lines coming from rapidly moving gas
• E) evidence that M87 may have grown to be a giant elliptical through collisions with other, smaller galaxies, some of whose material may have fallen into M87's center

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