ASTRO-110 Chapter Notes - Chapter 5: Spiral Galaxy, Star Formation, Association Football
Document Summary
How is gas recycled in the disk of our galaxy? the star-gas-star cycle. The galactic bulge: the center of our galaxy, like the halo, is redder than the disk. Because of the tremendous amount of gas and dust between us and the bulge, it has been difficult to see what lies at the heart of the milky way the center is in the direction of sagittarius. High resolution radio and x-ray surveys of the galaxy"s center show a very dynamic center, with a very bright object at the very center. X-ray image of sagittarius a: recent high resolution x-ray images of sgr. A reveal more structure and highlight the brightspot known as sgr. A* has a total luminosity of about 1,000,000 l and is concentrated in a relatively small region only 10 au across. Astronomers suspect there is a black hole at the center of sgr.
