Astarperhaps disturbed by anThe Origin ofencounter.withanotherstardhiftstowardasupermassNeblackholeSupermassiveBlackHoles超大质量黑洞的起源As the near side af the star triestoorbit faster than the tat side.theMostgalaxiesseemtoharborstaris temn apartbytidalforoes.supermassive black holes intheir centers大多数星系中心有黑洞Fedandfueledbystarsandgasfromthenear-central environmentMost ofthe mass of the star isfung away fromn the black hola..吸积近处恒星和气体。but roughly1percent talls intotheblackholeasanaccreticn diskforms
The Origin of Supermassive Black Holes 超大质量黑洞的起源 Most galaxies seem to harbor supermassive black holes in their centers 大多数星系中心有黑洞. Fed and fueled by stars and gas from the near-central environment 吸积近处恒星和气体
（视频黑洞吸积恒星
黑洞吸积恒星（视频）
The Discoveryof Quasars类星体的发现
The Discovery of Quasars 类星体的发现
FirstQuasar-3C273（1963)The discoveryThethirdCambridge(3C)catalog(1959)Radio sourcesMost are galaxiesSomestar-likesources(3C48,3C273),butnotstars.nd500070003000400060008000Wavelength ()
First Quasar – 3C273 (1963) The discovery • The third Cambridge (3C) catalog (1959) • Radio sources • Most are galaxies • Some star-like sources (3C48, 3C273), but not stars
FirstQuasar-3C273(1963)Diffuse gas (egouterlayersofastarBlack-bodyoranebula)source(eg stellarcore)wavelengthAbsorptionspectrum55006500750045005000600070004000SolarSpectrumwavelengthEmissionspectrumwavelengthContinuumspectrumnd500070003000400060008000Wavelength()
First Quasar – 3C273 (1963) Solar Spectrum