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