Physics, 21.04.2020 15:47 KathyRayG7456
M84, M87, and NGC 4258 all have accretion disks around their central black holes for which the rotational velocities have been measured in HST spectra. In M84, the disk extends 8 pc from the center and exhibits Doppler velocities as large as ±400 km/s with respect to the galaxy's overall radial velocity. In M87, the corresponding figures are 20 pc and 500 km/s. In NGC 4258, the figures are 0.5 ly and 1000 km/s. Calculate the black hole masses to two significant figures. Comment also on the assumptions under which you did your calculation (e. g., orbital plane viewed edge-on; note the appearance of the galaxies and their disks in the notes) and the effect this may have on the accuracy of the answers.
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M84, M87, and NGC 4258 all have accretion disks around their central black holes for which the rotat...
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