Active galaxies exhibit a spike of four orders of magnitude in this quantity known as the "big blue bump.
Active galaxies exhibit a spike of four orders of magnitude in this quantity known as the "big blue bump." A parametric description of space density as a function of this quantity is named for Paul Schechter. Malmquist bias affects surveys of astronomical objects by making it appear that further objects intrinsically have higher values for this quantity. This quantity is related to the velocity width of (*) spiral galaxies by the TullyFisher relation. Stars can be categorized into classes named after this quantity according to the widths of their spectral lines; those classes are designated by Roman numerals. Instability results when a star exceeds the Eddington limit for this quantity, and it is proportional to the fourth power of the temperature. For 10 points, name this quantity representing the energy output per unit time, a measurement of brightness.
Active galaxies exhibit a spike of four orders of magnitude in this quantity known as the "big blue bump.
luminosity (prompt on "absolute magnitude" or "brightness" before mentioned)