2.27 Astro 1 Section 1 Professor Brandt

2.27 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Friday February 27th 1999 Announcements: Lecture notes: Class 21 The center of our Galaxy - if we aren't at the center of our galaxy then what is? Answer is somewhat surprising and we're only getting the final answer over the last 10 years. Hard to study the center of our galaxy. Lots of gas and dustblocking the light. trillion = 1x10 12 optical photons sent out only 1 gets through Need to study Galactic center where absorption by dust is less. Redder light or bluer light? Redder light is better because it is absorbed less. Infrared is even better. Also radio and X-rays are good. Galactic center located in constellation of Sagittarius. Radio astronomers found a powerful radio source in direction of galactic center. Named it Sag A*. Smaller than a few AU but emits > 5 L (.) in radio. People have now studied the motions of the stars and gas near the center - see them moving extremely fast. Can work out the mass of the object the stars/gas are orbiting. Like for planets and sun or binary stars. Use Newton's law to get mass.
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This note was uploaded on 02/20/2008 for the course ASTRO 1 taught by Professor Brandt during the Spring '99 term at Penn State.

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2.27 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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