This quantity is directly proportional to the velocity dispersion to the fourth power, according to the Faber-Jackson relation.
Dividing a unit of measure of this quantity by meters squared gives a unit named for Karl Jansky. This quantity is directly proportional to the velocity dispersion to the fourth power, according to the Faber-Jackson relation. A maximum for it can be found by setting radiation (*) pressure equal to gravitational force. The absolute bolometric magnitude is proportional to the log of this quantity, which is theoretically bound by the Eddington limit. The Stefan-Boltzmann equation states that sigma times area times temperature raised to the fourth power is equal to this quantity for a perfect blackbody.  For 10 points, name this quantity which measures the total amount of energy emitted by an astronomical object per unit time.
Dividing a unit of measure of this quantity by meters squared gives a unit named for Karl Jansky.
luminosity