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In astrophysics, a BzK galaxy is a galaxy that has been selected as star-forming or passive based on its photometry in the B, z, and K photometric bands.

The selection criteria, as originally defined, are as follows:

• Star-forming BzK (sBzK) galaxies satisfy: $BzK\equiv (z-K{)}_{AB}-(B-z{)}_{AB}\ge -0.2$
• Passive BzK (pBzK) galaxies satisfy: $BzK<-0.2$ and $(z-K{)}_{AB}>2.5$

See also

• Lyman-break galaxy

References

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