The 2dF Galaxy Redshift Survey: galaxy clustering per spectral type
/ Authors
D. Madgwick, E. Hawkins, O. Lahav, S. Maddox, P. Norberg, J. Peacock, I. Baldry, C. Baugh, J. Bland-Hawthorn, T. Bridges
and 19 more authors
R. Cannon, S. Cole, M. Colless, C. Collins, W. Couch, G. Dalton, G. Dalton, R. Propris, S. Driver, G. Efstathiou, R. Ellis, C. Frenk, K. Glazebrook, C. Jackson, I. Lewis, S. Lumsden, B. Peterson, W. Sutherland, K. Taylor
/ Abstract
We have calculated the two-point correlation functions in redshift space, �(�,�), for galaxies of different spectral types in the 2dF Galaxy Redshift Survey. Using these correlation functions we are able to estimate values of the linear redshi ft-space distortion parameter, � ≡ 0.6 m /b, the pairwise velocity dispersion, a, and the real-space correlation function, �(r), for galaxies with both relatively low star-formation rates (for which the present rate of star formation is less than 10% of its past averaged value) and galaxies with higher current starformation activity. At small separations, the real-space c lustering of passive galaxies is very much stronger than that of the more actively star-forming galaxies; the correlation-function slopes are respectively 1.93 and 1.50, and the relative bias between the two classes is a declining function of radius. On scales larger than 10h 1 Mpc there is evidence that the relative bias tends to a constant, bpassive/bactive ≃ 1. This result is consistent with the similar degrees of redshift-space distortions seen in the correlation func tions of the two classes ‐ the contours
Journal: Monthly Notices of the Royal Astronomical Society