Question

The cluster of galaxies creates a gravitational lens for a background galaxy, forming an Einstein ring. The spectrum of this galaxy has a redshift of 0.183.

• i.What is the distance of the background galaxy?
• ii.Calculate the approximate diameter in arcminutes of the Einstein ring produced by this gravitational lens.
• iii.In the analysis above, distances have been determined from the Hubble Law. How are the distances used in the equation for the calculation in part (b)(ii) normally defined?

  What other assumption has been made in performing this calculation?

Answer 1

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