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If a disk galaxy is reasonably close and edge-on, the Doppler shift of the galaxy disk material ...

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If a disk galaxy is reasonably close and edge-on, the Doppler shift of the galaxy disk material ...

If a disk galaxy is reasonably close and edge-on, the Doppler shift of the galaxy disk material relative to the centre can be measured at several distances from the galaxy's centre. What does this measurement tell us about the galaxy?

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the galaxy's luminosity

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the galaxy's diameter

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the galaxy's mass

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the galaxy's velocity dispersion curve

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ASTRO

Edition: 3^rd

Authors: Ghose, Milosevic-Zdjelar, Read

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