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Discovery Projects - Grant ID: DP140100198

Discovery Projects - Grant ID: DP140100198
ARC | Discovery Projects
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  • MultiDark-Galaxies: data release and first results

    Knebe, Alexander; Stoppacher, Doris; Prada, Francisco; Behrens, Christoph; Benson, Andrew; Cora, Sofia A.; Croton, Darren J.; Padilla, Nelson D.; Ruiz, Andrés N.; Sinha, Manodeep; Stevens, Adam R. H.; Vega-Martínez, Cristian A.; Behroozi, Peter; Gonzalez-Perez, Violeta; Gottlöber, Stefan;... (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    We present the public release of the MultiDark-Galaxies: three distinct galaxy catalogues derived from one of the Planck cosmology MultiDark simulations (i.e. MDPL2, with a volume of (1 Gpc/$h$)$^{3}$ and mass resolution of $1.5 \times 10^{9} M_{\odot}/h$) by applying the semi-analytic models GALACTICUS, SAG, and SAGE to it. We compare the three models and their conformity with observational data for a selection of fundamental properties of galaxies like stellar mass function, star formation ...

    Haloes at the ragged edge: The importance of the splashback radius

    Snaith, O. N.; Bailin, J.; Knebe, A.; Stinson, G.; Wadsley, J.; Couchman, H. (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    We have explored the outskirts of dark matter haloes out to 2.5 times the virial radius using a large sample of halos drawn from Illustris, along with a set of zoom simulations (MUGS). Using these, we make a systematic exploration of the shape profile beyond R$_{vir}$. In the mean sphericity profile of Illustris halos we identify a dip close to the virial radius, which is robust across a broad range of masses and infall rates. The inner edge of this feature may be related to the virial radius...

    Stability of Satellite Planes in M31 II: Effects of the Dark Subhalo Population

    Fernando, Nuwanthika; Arias, Veronica; Lewis, Geraint F.; Ibata, Rodrigo A.; Power, Chris (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    The planar arrangement of nearly half the satellite galaxies of M31 has been a source of mystery and speculation since it was discovered. With a growing number of other host galaxies showing these satellite galaxy planes, their stability and longevity have become central to the debate on whether the presence of satellite planes are a natural consequence of prevailing cosmological models, or represent a challenge. Given the dependence of their stability on host halo shape, we look into how a g...

    Universal subhalo accretion in cold and warm dark matter cosmologies

    Kubik, Bogna; Libeskind, Noam I.; Knebe, Alexander; Courtois, Hélène; Yepes, Gustavo; Gottlöber, Stefan; Hoffman, Yehuda (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    The influence of the large scale structure on host halos may be studied by examining the angular infall pattern of subhalos. In particular, since warm and cold dark matter cosmologies predict different abundances and internal properties for halos at the low mass end of the mass function, it is interesting to examine if there are differences in how these low mass halos are accreted. The accretion events are defined as the moment a halo becomes a substructure, namely when it crosses its host's ...

    The large-scale environment from cosmological simulations I: The baryonic cosmic web

    Cui, Weiguang; Knebe, Alexander; Yepes, Gustavo; Yang, Xiaohu; Borgani, Stefano; Kang, Xi; Power, Chris; Staveley-Smith, Lister (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    Using a series of cosmological simulations that includes one dark-matter-only (DM-only) run, one gas cooling-star formation-supernovae feedback (CSF) run and one that additionally includes feedback from active galactic nuclei (AGNs), we classify the large-scale structures with both a velocity-shear-tensor code (Vweb) and a tidal-tensor code (Pweb). We find that the baryonic processes have almost no impact on large-scale structures -- at least not when classified using aforementioned technique...

    Large-Scale Structure Topology in Non-Standard Cosmologies: Impact of Dark Sector Physics

    Watts, Andrew L.; Elahi, Pascal J.; Lewis, Geraint F.; Power, Chris (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198), ARC | Discovery Projects - Grant ID: DP130100117 (DP130100117)
    Even as our measurements of cosmological parameters improve, the physical nature of the dark sector of the universe largely remains a mystery. Many effects of dark sector models are most prominent at very large scales and will rely on future galaxy surveys to elucidate. In this paper we compare the topological properties of the large scale dark matter distribution in a number of cosmological models using hydrodynamical simulations and the cosmological genus statistic. Genus curves are compute...

    Constrained Local UniversE Simulations: A Local Group Factory

    Carlesi, Edoardo; Sorce, Jenny G.; Hoffman, Yehuda; Gottlöber, Stefan; Yepes, Gustavo; Libeskind, Noam I.; Pilipenko, Sergey V.; Knebe, Alexander; Courtois, Helene; Tully, R. Brent; Steinmetz, Matthias (2016)
    Projects: ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198), ARC | Discovery Projects - Grant ID: DP130100117 (DP130100117)
    Near field cosmology is practiced by studying the Local Group (LG) and its neighbourhood. The present paper describes a framework for simulating the near field on the computer. Assuming the LCDM model as a prior and applying the Bayesian tools of the Wiener filter (WF) and constrained realizations of Gaussian fields to the Cosmicflows-2 (CF2) survey of peculiar velocities, constrained simulations of our cosmic environment are performed. The aim of these simulations is to reproduce the LG and ...

    Cosmic Voids in Evolving Dark Sector Cosmologies: the Low Redshift Universe

    Adermann, Eromanga; Elahi, Pascal J.; Lewis, Geraint F.; Power, Chris (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP130100117 (DP130100117), ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    We present a comparison of void properties between the standard model of cosmology, $\Lambda$ Cold Dark Matter ($\Lambda$CDM), and two alternative cosmological models with evolving and interacting dark sectors: a quintessence model ($\phi$CDM) and a Coupled Dark Matter-Dark Energy (CDE) model. Using $N$-body simulations of these models, we derive several measures of void statistics and properties, including distributions of void volume, ellipticity, prolateness, and average density. We find t...

    Reionization of the Milky Way, M31, and their satellites – I. Reionization history and star formation

    Dixon, Keri L; Iliev, Ilian T; Gottlöber, Stefan; Yepes, Gustavo; Knebe, Alexander; Libeskind, Noam; Hoffman, Yehuda (2018)
    Projects: RCUK | Astrophysics and Cosmology at the University of Sussex (ST/F002858/1), ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    Observations of the Milky Way (MW), M31, and their vicinity, known as the Local Group (LG), can provide clues about the sources of reionization. We present a suite of radiative transfer simulations based on initial conditions provided by the Constrained Local UniversE Simulations (CLUES) project that are designed to recreate the Local Universe, including a realistic MW-M31 pair and a nearby Virgo. Our box size (91 Mpc) is large enough to incorporate the relevant sources of ionizing photons fo...

    nIFTy cosmology: Galaxy/halo mock catalogue comparison project on clustering statistics

    Chuang, Chia-Hsun; Zhao, Cheng; Prada, Francisco; Munari, Emiliano; Avila, Santiago; Izard, Albert; Kitaura, Francisco-Shu; Manera, Marc; Monaco, Pierluigi; Murray, Steven; Knebe, Alexander; Scóccola, Claudia G.; Yepes, Gustavo; Garcia-Bellido, Juan; Marín, Felipe A.;... (2015)
    Projects: ARC | Discovery Projects - Grant ID: DP130100117 (DP130100117), ARC | Discovery Projects - Grant ID: DP140100198 (DP140100198)
    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved We present a comparison of major methodologies of fast generating mock halo or galaxy catalogues. The comparison is done for two-point (power spectrum and two-point correlation function in real and redshift space), and the three-point clustering statistics (bispectrum and...
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