Question: Question 3: (a) A Type Ia supernova is seen to occur in the central bulge of a spiral galaxy. At its peak, the total apparent

Question 3: (a) A Type Ia supernova is seen to occur

total apparent magnitude of the bulge plus the supernova 1s V= 13.68.

Question 3: (a) A Type Ia supernova is seen to occur in the central bulge of a spiral galaxy. At its peak, the total apparent magnitude of the bulge plus the supernova 1s V= 13.68. Pre-explosion images reveal the bulge alone to have a magnitude V' = 14.21. Assuming that all Type Ia supernova have peak absolute visual magnitudes of , calculate the distance to this galaxy, assuming there is no extinction in the direction of the supernova. [8] (b) Estimate the observed wavelength of the HP line (rest- frame wavelength 486.1 nm) in this galaxy. Assume the Hubble constant has the value 67.4 kms'Mpc. [5]

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