PCS 181 Lecture Notes - Lecture 5: Accretion Disk, London Academy Of Music And Dramatic Art, Dominant Wavelength

• School: Ryerson University
• Department: Physics
• Course: PCS 181
• Professor: Margaret Buckby

Document Summary

Apparent size of quasar = d = v t. After we correct for the distance to the quasar, we find that. Qso 3c273 was the size of a large star! Quasars are usually found in groups of galaxies. The quasars and the galaxies have similar redshifts: similar velocities, similar distances, an association. Quasars are very luminous centers of distant, young galaxies. Quasar energy is radiated by matter swirling in an accretion disk around a supermassive. Small, compact, blue objects (x-rays are the dominant wavelength) Large redshifts such that uv spectral lines appear in visible portion of the spectrum. Know the names of the three spectra and how they are generated for the test (refer to the handout) Optical luminosities are 100 to 1000 times that of normal galaxies. Many vary in intensity over days or weeks. Some quasars exhibit jets (optical or radio) This is dust and gas that occupy space between the stars.