Subject: Intro to astrophysics, Doppler effect The quasar 3C 273 is moving away from the Milky Way at a speed of 47,500k

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Subject: Intro to astrophysics, Doppler effect
The quasar 3C 273 is moving away from the Milky Way at a speedof 47,500kms−1. (i) what is the redshift, z, of 3C 273?Do the calculation with the two versions of the Doppler equation(non-relativistic and relativistic), and determine if thedifference in the calculations exceeds 10% (ii) If the-Hubble-Lemaˆıtre constant is 70 kms−1/Mpc, how far awayis the quasar (iii) if the flux of the quasar is 3 ×10−13W/m2, what is the luminosity of thequasar? (iv) How many years would it take the Sun to produce theenergy the quasar produces in 1 second?Answers: (i): non-relativistic z: 0.158; relativistic z: 0.173; ∆z: 9.5% (ii) d = 678.571 Mcf (iii) LQ = 1.653 × 1039W (iv) 134.386years.
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