The m - m
_{AB}- AB magnitude at frequency ν - f
_{ν}- monochromatic Flux density at frequency ν in janskys.
A consequence of magnitudes being logarithmic is no magnitude cannot represent "zero flux" since zero has no logarithm (or it might be referred to as "minus infinity"). A brightness must be chosen to be represented by zero magnitude, which defines the magnitude's scale.
measure,brightness,logarithmic,EMR)http://www.astronomy.ohio-state.edu/~martini/usefuldata.html http://dls.physics.ucdavis.edu/calib/vegaab.html https://www.astro.umd.edu/~ssm/ASTR620/mags.html Referenced by:
Vega System |