Calculating the Hubble Constant (Ho) 1. Using the equations given in the introduction, find the distance and recessional velocities of the galaxies in the following table. 2. Make a graph with recessional velocity (in km/s) on the y-axis and distance (in megaparsecs (Mpc)) on the x-axis. 3. Plot each of the galaxies in the table on this graph. 4. Find the slope of the best fit line for the plotted data. 5. Compare your slope to the accepted value of Hubble's constant (Ho = 70 km/Mpc) by computing your percent error. For each galaxy in the table below, assume that the absolute magnitude is (M = -21) and the emitted wavelength of light is (A(emitted) =656 nm). Galaxy Apparent Magnitude (m) X(obsorved) (nm) 1 2.5 656.08 4 656.15 3 12.5 663.9 4 15.5 687.5 18.5 793.76 19 833.1 20.5 1089 8. 21 1272.6 9. 21.4 1561.3 10 22 3536

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