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Putting it All Together – Making Predictions

What will your model show you to help you characterize the black hole accretion?

First you will model the continuum – the spectrum will show some "continuous" X-ray emission, which is basically a rainbow where all colors are represented. Then you will examine the spectrum for any features that are not modeled by the continuous emission. These are likely to be emission or absorption lines.

If you find a line in the spectrum, you will then model it, and see if it is redshifted or blueshifted. Using the information from the best fit model for the line, you may also be able to calculate how fast the material is moving toward or away from you.

Make a Prediction

What do you expect to see? If you see a line, do you expect it to be redshifted (which would mean the material is moving away from us and into the black hole)? Or, do you expect it to be blueshifted (which would mean its moving toward you, and away from the black hole)? Write down your prediction along the reason you think you'll see what you predicted.

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Imagine the Universe! is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

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Project Leader: Dr. Barbara Mattson
Curator: Meredith Gibb
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This page last updated: Thursday, 25-Mar-2010 08:54:55 EDT