What Method Is Used by Astronomers to Infer the Existence

question 131

Multiple Choice

What method is used by astronomers to infer the existence in space of a dark object of about 5 solar masses, such as a black hole?

• A) infrared imaging of a region whose effective temperature is lower than the cosmic microwave background, rendering it dark
• B) measurement of the gravitational redshift of spectral lines in the spectrum of the object
• C) measurement of the effect of its gravitational force on a companion object in a binary system
• D) estimation of the luminosity of the object and the application of the mass-luminosity relationship

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