leda Compilation of photometry site

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This catalogue (table a107 in the database) presents the compilation of apparent fluxes (magnitudes) of galaxies. They are collected from the litterature and from surveys and are not corrected for Galactic extinction or for any other effect.

As a short introduction, see this article on astronomical magnitude systems (by Wirth) and this one on magnitude of galaxies (from NED).
Read the review article Standard Photometric Systems (Bessell 2005), and consult the Asiago Database on Photometric Systems (Munary) and the General Catalogue of Photometric Data (Mermillod).

Some other resources:
Magnitude System and Color Conversion Formulas (Seiichi Yoshida)
Conversions between Johnson and AB magnitudes: Frei and Gunn 1995
Conversions between Vega and AB magnitudes: Blanton et al., Astronomical Journal 127, 2562-2578 (2005), eqs.(5))

Statistics of the compilation of phootmetry

The first ten sources of phootmetry