Skip to main content

Research Repository

Advanced Search

How dark matter halos cluster in Lagrangian space

Porciani, C.; Catelan, P.; Lacey, C.

How dark matter halos cluster in Lagrangian space Thumbnail


Authors

C. Porciani

P. Catelan



Abstract

We investigate the clustering of dark matter halos in Lagrangian space in terms of their two-point correlation function. Analyzing a set of collisionless scale-free 1283 particle N-body simulations with spectral indices n=-2, -1, we measure the first two Lagrangian bias parameters b1 and b2 relating halo and mass correlations. We find that the Mo & White leading-order formula for b1 describes the clustering of halos with mass MgtrsimM$\mathstrut{_{{\star}}}$ (where Msstarf indicates the characteristic nonlinear mass) quite accurately. Smaller halos turn out to be less clustered in Lagrangian space than predicted by Mo & White. Our findings are consistent with the recent results of Jing for the clustering of halo populations in Eulerian space, demonstrating that the discrepancies between the N-body and analytical Mo & White prediction for the bias exist already in Lagrangian space. This shows that a more refined theoretical algorithm for selecting halos in the initial conditions needs to be developed. Finally, we present a very accurate fitting formula for the linear halo bias factor b1 in Lagrangian space.

Citation

Porciani, C., Catelan, P., & Lacey, C. (1999). How dark matter halos cluster in Lagrangian space. Astrophysical Journal Letters, 513(2), L99-L102. https://doi.org/10.1086/311922

Journal Article Type Article
Publication Date Mar 10, 1999
Deposit Date Feb 11, 2015
Publicly Available Date Mar 28, 2024
Journal Astrophysical Journal Letters
Print ISSN 2041-8205
Electronic ISSN 2041-8213
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 513
Issue 2
Pages L99-L102
DOI https://doi.org/10.1086/311922
Keywords Cosmology: theory, Galaxies: statistics, Large-scale structure of universe.

Files

Published Journal Article (90 Kb)
PDF

Copyright Statement
© 1999. The American Astronomical Society. All rights reserved.





You might also like



Downloadable Citations