5. (6 points) Problem 5: The radio afterglow of GW170817 was measured to have a flux density of about 100 ?Jy (microJansky) at 3 GHz at its peak of emission (about 100 days after the neutron star collision). Knowing that GW170817 was located in NGC 4993 at a distance of about 130 million light years from Earth (close enough that we can neglect any type of redshift correction), and that its radio flux density per unit frequency interval scaled approximately as F? ? ?????: 1. What is the flux density per unit wavelength interval of GW170817 at 3 GHz? Express your answer in erg cm?² s?¹ cm?¹. 2. Calculate the flux in the 3-30 GHz frequency band. Express your answer in erg cm?² s?¹. 3. Calculate the radio luminosity in the 3-30 GHz band assuming isotropic emission. Express your answer in erg/s. 6. (2 points) Problem 6: What is the ratio between the intensity I? of the Sun at a certain frequency as measured by an observer on Earth and by an observer on Venus? Explain your answer.
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