ASTR 1102 Lecture : Lecture35
Document Summary
Chaotic motion lots of gas cloud collisions. Interaction with our gravity compresses gas, triggers star formation. May be one way to create spiral arms. Like tidal gravity close to black hole. Small galaxy passes through middle of larger one. Built first true radio telescope in 1936. For a long time they were radio stars". Similar but radio quiet" objects dubbed quasi-stellar objects or qsos. In 1963 maarten schmidt recognized a pattern in 3c273. Lines were just hydrogen emission lines, but redshifted. 3c48: z = 0. 367 (30% speed of light) Redshift of quasar = redshift of cluster. Redshift of quasar = redshift of host. How can something so luminous be so small? (variability) The best answer we have is a supermassive black hole. Accretion of gas, dust, even whole stars provides energy. Radio galaxies and quasars often have radio jets. In cygnus a, lobes extend to 230,000 light years.
