AB magnitude

Given a flux density f, measured in ergs per second per square centimeter per hertz, the corresponding AB magnitude is defined as:

The AB magnitude system is defined such that for any bandpass or filter being considered, the magnitude zero-point corresponds to a flux density of 3631 Jy

(1 Jy = 1 Jansky = 10⁻²⁶ W Hz⁻¹ m⁻² = 10⁻²³ erg s⁻¹ Hz⁻¹ cm⁻²) ^[1]

For fluxes in units of [erg/s/cm2/A] the AB magnitude is given by ^[2]

External links

• Conversion from AB magnitudes to Johnson magnitudes

References

• Oke, J. B. (1974). "Absolute spectral energy distributions for white dwarfs". Astrophysical Journal Supplement Series 236 (27): 21–25. 

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