Part 3: The Spectra from Galaxies Are Redshifted. In 1912, American astronomer Vesto Slipher began to H8 30 273 Нү HIB R

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Part 3: The Spectra from Galaxies Are Redshifted. In 1912, American astronomer Vesto Slipher began to H8 30 273 Нү HIB Redshift observe more distant objects using a spectrometer, and he noticed that most of them had a distinct shift toward the red Blue end of the spectrum. He recognized this as a Doppler shift caused by the motion of Comparison spectrum the objects. A redshift means H8 that the source of light is Hy HB moving away from the 400 nm 500 nm observer. Figure 5 Redshifted spectrurn from quasar 30 273 Red E nm Figure 5 shows an emission spectrum from the quasar called 3C 273. We see that the emission lines due to hydrogen are shifted to the red end of the spectrum. The larger the redshift, the greater the relative motion. 6. Edwin Hubble extended this observation to more objects, and for several objects plotted the redshift versus the distance to the object. Try it for yourself. In Table 1, use the redshift of the spectral lines to determine the speed of each galaxy. To do this, use a ruler to align the leftmost spectral line provided with each galaxy with the speed scale at the bottom of the table. Table 1 Calcium Reference Lines Galaxy Distance (x 102 km) Speed (km/s) 395 400 405 nm NGC 1357 7.7 2100 NGC 1832 8.2 NGC2276 11.4 NGC3147 13.6 NGC3368 3.4 NGC 3627 3.1 NGC 4775 8.2 22.1 NGC 5548 10.0 NGC 6764 NGC 6745 19.7 Speed scale (km/s) 0 2000 4000 6000