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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/68154
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- Statistical analysis of galaxy surveys III: the non-linear clustering of red and blue galaxies in the 2dFGRS
- Croton, Darren J.; Norberg, Peder; Gaztanaga, Enrique; Baugh, Carlton M.
- We present measurements of the higher order clustering of red and blue galaxies as a function of scale and luminosity made from the two-degree field galaxy redshift survey (2dFGRS). We use a counts-in-cells analysis to estimate the volume-averaged correlation functions, ξp as a function of scale up to the order of p = 5, and also the reduced void probability function. Hierarchical amplitudes are constructed using the estimates of the correlation functions: Sp = ξp/ξp-1/2 . We find that (i) red galaxies display stronger clustering than blue galaxies at all orders measured; (ii) red galaxies show values of Sp that are strongly dependent on luminosity whereas blue galaxies show no segregation in Sp within the errors; this is remarkable given the segregation in the variance; (iii) the linear relative bias shows the opposite trend to the hierarchical amplitudes, with little segregation for the red sequence and some segregation for the blue; (iv) faint red galaxies deviate significantly from the 'universal' negative binomial reduced void probabilities followed by all other galaxy populations. Our results show that the characteristic colour of a galaxy population reveals a unique signature in its spatial distribution. Such signatures will hopefully further elucidate the physics responsible for shaping the cosmological evolution of galaxies.
- Publication type
- Journal article
- Monthly Notices of the Royal Astronomical Society, Vol. 379, no. 4 (Aug 2007), pp. 1562-1570
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Blue galaxies; Cosmology; Galaxy statistics; Large-scale structure of universe; Red galaxies; Statistics
- Wiley-Blackwell Publishing
- Publisher URL
- Copyright © 2007 The Authors. Journal compilation copyright © 2007 Royal Astronomical Society. Author's final draft reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed