PCS 181 Lecture Notes - Lecture 5: Parsec, Angular Diameter, Supermassive Black Hole
21 Mar 2013
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*note: test # -october 14, 2010, student i. d. , calculator, pencil, ~1963: moarten schmidt realized that we were looking at extemely red-shifted. Because vr triangle delta, the radial velocity of quasars is large. Because vr d, the distance to the quasars is great. Hydrogen spectrum in lab compared to 3c273. Let triangle delta = z such that. Vr = cz = z is called the (red-shifted) . Vr = c (0. 16) = 0. 16 c. = 16% of the speed of light! Vr = 0. 16 (3 x 108) m/s. 4. 8 x 107 m/s = 4. 8 x 104 km/s. *note: divide by 1000 to convert form from m/s to km/s. Similarly, 3c48 was moving at 0. 33c = 33% of the speed of light! Hundreds of quasars are now known and all are extremely red-shifted. D = (640 x 106 pc) (3. 26 ly) = 2. 09 x 109 ly. The fattest, most distant quasar known has z = 10.
