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

See also

• Lyman-break galaxy

References

1. Daddi, E.; Cimatti, A.; Renzini, A.; Fontana, A.; Mignoli, M.; Pozzetti, L.; Tozzi, P.; Zamorani, G. (2004). "A New Photometric Technique for the Joint Selection of Star-forming and Passive". The Astrophysical Journal. 617 (2): 746–764. arXiv:astro-ph/0409041. Bibcode:2004ApJ...617..746D. doi:10.1086/425569. S2CID 119370438.

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