I mentioned that quasars and other active galactic nuclei are thought to be poweredby supermassive black holes (SMBH). Let’s consider one aspect of this idea.(a) A typical quasar luminosity is about 10^12 L, where L = 3.83*10^33 erg s^-1 is the luminosity of the Sun. If the energy is released by mass falling into a SMBH,estimate the mass accretion rate. (Convenient units are solar masses per year.)(b) If the mass accretion rate is roughly constant, how long would it take to builda mass of 10^8M , were M is solar mass= 1.989 × 10^33 g? Is that long or short compared with the age of the Universe(about 14 Gyr)? Comment on whether the idea that quasars are powered by accretion onto SMBH makes sense or not.
padding: 10px 20px;
margin: 4px 2px;