BZK GALAXY

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,^[1] are as follows:

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

References

^ 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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[harvard-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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