Clustering of K-band selected local galaxies - INSPIRE

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Clustering of K-band selected local galaxies

May, 2009

13 pages

Published in:

Res.Astron.Astrophys. 9 (2009) 979

e-Print:

0905.4361 [astro-ph.CO]

DOI:

10.1088/1674-4527/9/9/004

View in:

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Abstract: (arXiv)

We present detailed clustering analysis of a large K-band selected local galaxy sample, which is constructed from the 2MASS and the SDSS and consists of

82,486

galaxies with

10 < K < 13.5

and

0.01 < z < 0.1

. The two-point correlation function of the magnitude-limited sample in real space at small scales is well described by a power law

\xi(r)=(r/6.44\pm0.23)^{-1.81\pm0.02}

. The pairwise velocity dispersion is derived from the anisotropic two-point correlation function and find the dispersion \sigma_{12}=685\pm 17\kms if its scale invariance is assumed, which is larger than values measured in optical bands selected galaxy samples. We further investigate the dependence of the two-point correlation function and the

\sigma_{12}

on the

g-r

color and the

K

-band luminosity, obtain similar results to previous works in optical bands. Comparing a mock galaxy sample with our real data indicates that the semi-analytical model can not mimic the

\sigma_{12}

in observation albeit it can approximate the two-point correlation function within measurement uncertainties.

Note:

13 pages, 6 figures, accepted by RAA

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