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According to the current paradigm, galaxies form and reside in extended cold dark matter (CDM) halos and in turn are key tracers of cosmological structure. Understanding how different types of galaxies occupy halos of different masses is…

天体物理学 · 物理学 2009-11-10 Ummi Abbas , Ravi K. Sheth

A physical understanding of galaxy formation and evolution benefits from an understanding of the connections between galaxies, their host dark matter halos, and their environments. In particular, interactions with more-massive neighbors can…

星系天体物理 · 物理学 2025-10-01 Haley Bowden , Peter Behroozi

We review recent results on the dependence of various galaxy properties on environment at low redshift. As environmental indicators, we use group mass, group-centric radius, and the distinction between centrals and satellites; examined…

宇宙学与河外天体物理 · 物理学 2015-05-27 Simone M. Weinmann , Frank C. van den Bosch , Anna Pasquali

We use the IllustrisTNG (TNG) simulations to explore the galaxy-halo connection as inferred from state-of-the-art cosmological, magnetohydrodynamical simulations. With the high mass resolution and large volume achieved by combining the 100…

[Abridged] The properties of observed galaxies and dark matter haloes in simulations depend on their environment. The term environment has been used to describe a wide variety of measures that may or may not correlate with each other.…

宇宙学与河外天体物理 · 物理学 2012-05-31 Marcel R. Haas , Joop Schaye , Akila Jeeson-Daniel

We compare state-of-the-art semi-analytic models of galaxy formation as well as advanced sub-halo abundance matching models with a large sample of early-type galaxies from SDSS at z < 0.3. We focus our attention on the dependence of median…

We demonstrate how the properties of a galaxy depend on the mass of its host dark matter subhalo, using two independent models of galaxy formation. For the cases of stellar mass and black hole mass, the median property value displays a…

星系天体物理 · 物理学 2015-08-26 S. Contreras , C. M. Baugh , P. Norberg , N. Padilla

We use large N-body simulations of dissipationless gravitational clustering in cold dark matter (CDM) cosmologies to study whether the properties of dark matter halos are affected by their environment. We look for correlations between the…

天体物理学 · 物理学 2009-09-25 Gerard Lemson , Guinevere Kauffmann

The cosmic web plays a major role in the formation and evolution of galaxies and defines, to a large extent, their properties. However, the relation between galaxies and environment is still not well understood. Here we present a machine…

星系天体物理 · 物理学 2018-04-11 Jianan Hui , Miguel A. Aragon-Calvo , Xinping Cui , James M. Flegal

The evolution of galaxies is known to be connected to their position within the large-scale structure and their local environmental density. We investigate the relative importance of these using the underlying dark matter density field…

星系天体物理 · 物理学 2026-02-11 Catherine Gallagher , Tariq Yasin , Richard Stiskalek , Harry Desmond , Matt J. Jarvis

We investigate the dependence of galaxy structure on a variety of galactic and environmental parameters for ~500,000 galaxies at z<0.2, taken from the Sloan Digital Sky Survey data release 7 (SDSS-DR7). We utilise bulge-to-total stellar…

We utilize the cosmological volume simulation, FIREbox, to investigate how a galaxy's environment influences its size and dark matter content. Our study focuses on approximately 1,200 galaxies (886 central and 332 satellite halos) in the…

According to the now strongly supported concordance $\Lambda$CDM model, galaxies may be grossly described as a luminous component embedded in a dark matter halo. The density profile of these mass dominating haloes may be determined by N -…

宇宙学与河外天体物理 · 物理学 2014-02-04 A. Del Popolo , V. F. Cardone

In hierarchical models, density fluctuations on different scales are correlated. This induces correlations between dark halo masses, their formation histories, and their larger-scale environments. In turn, this produces a correlation…

天体物理学 · 物理学 2009-11-13 Ummi Abbas , Ravi K. Sheth

A generic prediction of hierarchical clustering models is that the mass function of dark haloes in dense regions in the Universe should be top-heavy. We provide a novel test of this prediction using a sample of galaxies drawn from the Sloan…

天体物理学 · 物理学 2009-11-11 Ummi Abbas , Ravi K. Sheth

We investigate the dependence of physical properties of galaxies on small and large scale density environment. The galaxy population consists of mainly passively evolving galaxies in comparatively low density regions of Sloan Digital Sky…

星系天体物理 · 物理学 2018-07-02 Jaswant K. Yadav , Xuelei Chen

Observations indicate that central galaxies show a significant alignment of their main shape axes with other galaxies in their group, as well as with the large-scale structure of the universe. Simulations have corroborated this finding,…

Elucidating the connection between the properties of galaxies and the properties of their hosting haloes is a key element in galaxy formation. When the spatial distribution of objects is also taken under consideration, it becomes very…

We present a modification of the standard halo model with the goal of providing an improved description of galaxy clustering. Recent surveys, like the Sloan Digital Sky Survey (SDSS) and the Anglo-Australian Two-degree survey (2dF), have…

宇宙学与河外天体物理 · 物理学 2015-05-19 Héctor Gil-Marín , Raul Jimenez , Licia Verde

The stellar mass - halo mass relation provides a strong basis for connecting galaxies to their host dark matter halos in both simulations and observations. Other observable information, such as the density of the local environment, can…

星系天体物理 · 物理学 2023-10-19 Haley Bowden , Peter Behroozi , Andrew Hearin
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