These entities mostly populate the blue cloud of the color-magnitude diagram.
These entities mostly populate the blue cloud of the color-magnitude diagram. When viewed in anon-inertial reference frame rotating at the global pattern speed, quasi-static density waves can beobserved in these entities. Vera Rubin noted that the rotation curves of these entities did not drop offwith radius as expected. Doppler broadening of the 21 cm line of hydrogen is used to calculate one oftheir properties in the Tully-Fisher relation. Objects such as Sagittarius A-Star and other (*)supermassive black holes form the characteristic bulges at the centers of these galaxies, which EdwinHubble plotted on the top of his tuning fork diagram. For 10 points, name this class of galaxy which has a"barred" variety, one example of which is the Milky Way.
These entities mostly populate the blue cloud of the color-magnitude diagram.
spiral galaxy [accept barred spiral galaxy; prompt on "galaxy"]