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Observations of a galaxy located 20 Mpc away give us the total flux and the radial...

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Physics

Observations of a galaxy located 20 Mpc away give us the totalflux and the radial velocity of stars within circles on the skythat correspond to radii of 100 and 1000 pc.

Within these two regions, the results are as follows:

100 pc radius -- Total flux (Wm-2):  2.1×10-16,  vr(km s-1): 290

1000 pc radius -- Total flux (W m-2):1.5×10-14,  vr (km s-1):250

Use these data to answer the following questions about thegalaxy.

A) Calculate M, L, and M/L, all in solar units, for the regionof the galaxy contained within a 1 kpc radius.

B) Repeat for a 100 pc radius.

C) Based on your answers for the first two parts, do you thinkthere is a supermassive black hole at the center of this galaxy?Estimate the mass of the possible black hole.

Answer & Explanation Solved by verified expert
4.4 Ratings (778 Votes)
1 conversion factorsA for R 1 kpc ie 1000 pc radiiCalculation for    See Answer
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