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The fact that the clustering of dark matter halos depends not only on their mass, but also the formation epoch, is a prominent, albeit subtle, feature of the cold dark matter structure formation theory, and is known as assembly bias. At low…

In this paper we use the ``Millennium Simulation'' to re-examine the mass assembly history of dark matter halos and the age dependence of halo clustering. We use eight different definitions of halo formation times to characterize the…

Astrophysics · Physics 2009-11-13 Yun Li , H. J. Mo , L. Gao

The halo assembly bias, a phenomenon referring to dependencies of the large-scale bias of a dark matter halo other than its mass, is a fundamental property of the standard cosmological model. First discovered in 2005 from the Millennium Run…

Cosmology and Nongalactic Astrophysics · Physics 2022-10-19 Yen-Ting Lin , Hironao Miyatake , Hong Guo , Yi-Kuan Chiang , Kai-Feng Chen , Ting-Wen Lan , Yu-Yen Chang

The large-scale linear halo bias encodes the relation between the clustering of dark-matter (DM) halos and that of the underlying matter density field. Although the primary dependence of bias on halo mass is well understood in the context…

Cosmology and Nongalactic Astrophysics · Physics 2025-03-19 Antonio D. Montero-Dorta , Sergio Contreras , M. Celeste Artale , Facundo Rodriguez , Ginevra Favole

We address the question of whether or not assembly bias arises in the absence of highly non-linear effects such as tidal stripping of halos near larger mass concentrations. Therefore, we use a simplified dynamical scheme where these effects…

Astrophysics · Physics 2009-11-13 Jose Ariel Keselman , Adi Nusser

The two-point clustering of dark matter halos is influenced by halo properties besides mass, a phenomenon referred to as halo assembly bias. Using the depth of the gravitational potential well, $V_{\rm max}$, as our secondary halo property,…

Cosmology and Nongalactic Astrophysics · Physics 2016-03-23 Tomomi Sunayama , Andrew P. Hearin , Nikhil Padmanabhan , Alexie Leauthaud

We use a very large simulation of structure growth in a LCDM universe -- the Millennium Simulation -- to study assembly bias, the fact that the large-scale clustering of haloes of given mass varies significantly with their assembly history.…

Astrophysics · Physics 2009-09-28 Liang Gao , Simon D. M. White

Halo assembly bias is a phenomenon whereby the clustering of dark matter halos is dependent on halo properties, such as age, at fixed mass. Understanding the origin of assembly bias is important for interpreting the clustering of galaxies…

Cosmology and Nongalactic Astrophysics · Physics 2024-10-10 William Smith , Andreas Berlind , Manodeep Sinha

The clustering of dark halos depends not only on their mass but also on their assembly history, a dependence we term `assembly bias'. Using a galaxy formation model grafted onto the Millennium Simulation of the LCDM cosmogony, we study how…

Astrophysics · Physics 2009-09-29 Darren J. Croton , Liang Gao , Simon D. M. White

Secondary halo bias, commonly known as 'assembly bias,' is the dependence of halo clustering on a halo property other than mass. This prediction of the Lambda-Cold Dark Matter cosmology is essential to modelling the galaxy distribution to…

Cosmology and Nongalactic Astrophysics · Physics 2018-08-30 Yao-Yuan Mao , Andrew R. Zentner , Risa H. Wechsler

We investigate the origin of halo assembly bias, the dependence of halo clustering on assembly history. We relate halo assembly to peak properties measured in the Lagrangian space of the initial linear Gaussian random density field, and…

Astrophysics · Physics 2010-05-25 Neal Dalal , Martin White , J. Richard Bond , Alexander Shirokov

We study an assembly-type bias parametrized by the dimensionless spin parameter that affects massive structures. In numerical simulations higher spin haloes are more strongly clustered than lower spin haloes of equal mass. We detect a…

Cosmology and Nongalactic Astrophysics · Physics 2012-08-28 Ivan Lacerna , Nelson Padilla

The clustering of dark matter halos depends on the assembly history of halos at fixed halo mass; a phenomenon referred to as \textit{halo assembly bias}. Halo assembly bias is readily observed in cosmological simulations of dark matter.…

Cosmology and Nongalactic Astrophysics · Physics 2022-07-08 Tomomi Sunayama , Surhud More , Hironao Miyatake

The clustering of galaxies encodes key information about the structure and assembly history of their host dark matter (DM) haloes, providing a powerful probe of the origin of extreme high-redshift systems. While halo assembly bias has been…

Cosmology and Nongalactic Astrophysics · Physics 2026-03-18 Zihao Wang , Fangzhou Jiang , Haonan Zheng , Xuejian Shen , Zixiang Jia , Luis C. Ho , Kohei Inayoshi , Linhua Jiang

We explore the phenomenon commonly known as halo assembly bias, whereby dark matter halos of the same mass are found to be more or less clustered when a second halo property is considered, for halos in the mass range $3.7 \times 10^{11} \;…

It is common practice for methods that use galaxy clustering to constrain the galaxy-halo relationship, such as the halo occupation distribution (HOD) and/or conditional luminosity function (CLF), to assume that halo mass alone suffices to…

Cosmology and Nongalactic Astrophysics · Physics 2015-02-11 Andrew R. Zentner , Andrew P. Hearin , Frank C. van den Bosch

We test whether halo age and galaxy age are correlated at fixed halo and galaxy mass. The formation histories, and thus ages, of dark matter halos correlate with their large-scale density $\rho$, an effect known as assembly bias. We test…

Astrophysics of Galaxies · Physics 2017-10-11 Jeremy Tinker , Andrew Wetzel , Charlie Conroy , Yao-Yuan Mao

Dark matter halo clustering depends not only on halo mass, but also on other properties such as concentration and shape. This phenomenon is known broadly as assembly bias. We explore the dependence of assembly bias on halo definition,…

Assembly bias describes the finding that the clustering of dark matter haloes depends on halo formation time at fixed halo mass. In this paper, we analyse the influence of assembly bias on galaxy clustering using both semi-analytical models…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 Lan Wang , Simone M. Weinmann , Gabriella De Lucia , Xiaohu Yang

Context. Galaxies in the Universe show a conformity in the fraction of quenched galaxies out to large distances, being much larger around quenched central galaxies than for star-forming ones. On the other hand, simulations have shown that…

Astrophysics of Galaxies · Physics 2025-11-19 Ivan Lacerna , Nelson Padilla , Daniela Palma
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