Arxiv Papers

Last entries in the CiteULike library

For the full list: http://www.citeulike.org/group/13962/

Earlier
(22 Feb 2017)We characterized the population of galaxy clusters detected with the SZ effect with Planck, by measuring the cool core state of the objects in a well-defined subsample of the Planck catalogue. We used as indicator the concentration parameter Santos et al. (2008). The fraction of cool core clusters [...]
Fri, Feb 24, 2017
Source: CiteULike Group Cosmo LUTH
(16 Feb 2017)We present UV luminosity functions of star-forming galaxies at $z∼6-10$ derived with the full-data set of the Hubble Frontier Fields (HFF) program consisting of 6 lensing-cluster and parallel-field data. We obtain a catalog of $∼400$ dropout galaxy candidates at $z∼6-10$ whose UV absolute magnitudes reach $∼-14$ mag. We [...]
Fri, Feb 17, 2017
Source: CiteULike Group Cosmo LUTH
(16 Feb 2017)The observationally derived Kennicutt-Schmidt (KS) relation slopes differ from study to study, ranging from sub-linear to super-linear. We investigate the KS-relation variety (slope and normalization) as a function of integrated intensity ratio, R31=CO(J=3-2)/CO(J=1-0) using spatially resolved CO(J=1-0), CO(J=3-2), HI, Ha and 24um data of three nearby spiral galaxies [...]
Fri, Feb 17, 2017
Source: CiteULike Group Cosmo LUTH
(7 Feb 2017)We present predictions for the outcome of deep galaxy surveys with the James Webb Space Telescope (JWST) obtained from a physical model of galaxy formation in $Λ$CDM. We use the latest version of the GALFORM model, embedded within a new ($800$ Mpc)$^3$ dark matter only simulation with a [...]
Thu, Feb 09, 2017
Source: CiteULike Group Cosmo LUTH
(26 Jan 2017)We present the results of a study investigating the dust attenuation law at $z∼eq 5$, based on synthetic spectral energy distributions (SEDs) calculated for a sample of N=498 galaxies drawn from the First Billion Years (FiBY) simulation project. The simulated galaxies at $z∼eq 5$, which have M$_1500 ≤ [...]
Mon, Jan 30, 2017
Source: CiteULike Group Cosmo LUTH
(25 Jan 2017)We constrain cold dark energy of negligible sound speed using observations of the abundance of galaxy clusters. In contrast to standard quasi-homogeneous dark energy, negligible sound speed implies clustering of the dark energy fluid at all scales, allowing us to measure the effects of dark energy perturbations at [...]
Thu, Jan 26, 2017
Source: CiteULike Group Cosmo LUTH
(23 Jan 2017)Future galaxy surveys require realistic mock catalogues to understand and quantify systematics in order to make precise cosmological measurements. We present a halo lightcone catalogue and halo occupation distribution (HOD) galaxy catalogue built using the Millennium-XXL (MXXL) simulation. The halo catalogue covers the full sky, extending to z [...]
Wed, Jan 25, 2017
Source: CiteULike Group Cosmo LUTH
(24 Jan 2017)We present a halo model-based approach to calculate the cross-correlation between $21cm$ HI intensity fluctuations and $Lyα$ emitters (LAE) during the epoch of reionization (EoR). Ionizing radiation around dark matter halos are modeled as bubbles with the size and growth determined based on the reionization photon production, among [...]
Wed, Jan 25, 2017
Source: CiteULike Group Cosmo LUTH
Monthly Notices of the Royal Astronomical Society (24 Jan 2017), stx191, doi:10.1093/mnras/stx191Modern theories of galaxy formation predict that galaxies impact on their gaseous surroundings, playing the fundamental role of regulating the amount of gas converted into stars. While star-forming galaxies are believed to provide feedback through galactic winds, Quasi-Stellar Objects [...]
Wed, Jan 25, 2017
Source: CiteULike Group Cosmo LUTH
(19 Jan 2017)Understanding Ly$α$ emitting galaxies (LAEs) can be a key to reveal cosmic reionization and galaxy formation in the early Universe. Based on halo merger trees and Ly$α$ radiation transfer calculations, we model redshift evolution of LAEs and their observational properties at $z ≥ 6$. We consider ionized bubbles [...]
Mon, Jan 23, 2017
Source: CiteULike Group Cosmo LUTH
(19 Jan 2017)The Candidate Cluster and Protocluster Catalog (CCPC) contains 218 galaxy overdensities com- posed of more than 2000 galaxies with spectroscopic redshifts spanning the first few Gyrs after the Big Bang (2.0 < z < 6.6). We use Spitzer archival data to track the underlying stellar mass of these [...]
Mon, Jan 23, 2017
Source: CiteULike Group Cosmo LUTH
(19 Jan 2017)The effect of baryons on the matter power spectrum is likely to have an observable effect for future galaxy surveys, like Euclid or LSST. As a first step towards a fully predictive theory, we investigate the effect of non-radiative hydrodynamics on the structure of galaxy groups sized halos, [...]
Fri, Jan 20, 2017
Source: CiteULike Group Cosmo LUTH
(3 Jan 2017)We present an optically-selected cluster catalog from the Hyper Suprime-Cam (HSC) Subaru Strategic Program. The HSC images are sufficiently deep to detect cluster member galaxies down to $M_*∼ 10^10.2M_odot$ even at $z∼ 1$, allowing a reliable cluster detection at such high redshifts. We apply the CAMIRA algorithm to [...]
Thu, Jan 05, 2017
Source: CiteULike Group Cosmo LUTH
(3 Jan 2017)We systematically study, in the context of the standard cold dark matter model, star-formation suppression effects of two important known physical processes --- gravitational shock heating due to formation of massive halos and large-scale structure and photoheating due to reionization of the intergalactic medium --- on the global [...]
Thu, Jan 05, 2017
Source: CiteULike Group Cosmo LUTH
(3 Jan 2017)We utilize cosmological hydrodynamic simulations to study the formation of Population III (Pop III) stars in dark matter halos exposed to strong ionizing radiation. We simulate the formation of three halos subjected to a wide range of ionizing fluxes, and find that for high flux, ionization and photoheating [...]
Thu, Jan 05, 2017
Source: CiteULike Group Cosmo LUTH
(27 Dec 2016)We present evidence for halo assembly bias as a function of geometric environment. By classifying GAMA galaxy groups as residing in voids, sheets, filaments or knots using a tidal tensor method, we find that low-mass haloes that reside in knots are older than haloes of the same mass [...]
Wed, Dec 28, 2016
Source: CiteULike Group Cosmo LUTH
(17 Dec 2016)The recent low value of Planck (2016) integrated optical depth to Thomson scattering suggests that the reionization occurred fairly suddenly, disfavoring extended reionization scenarios. This will have a significant impact on the 21cm power spectrum. Using a semi-numerical framework, we improve our model from Hassan et al. (2016) [...]
Tue, Dec 20, 2016
Source: CiteULike Group Cosmo LUTH
(16 Dec 2016)Recent observational evidence for initial mass function (IMF) variations in massive quiescent galaxies at $z = 0$ challenges the long-established paradigm of a universal IMF. While a few theoretical models relate the IMF to birth cloud conditions, the physical driver underlying these putative IMF variations is still largely [...]
Tue, Dec 20, 2016
Source: CiteULike Group Cosmo LUTH
(16 Dec 2016)We present a joint analysis of Chandra X-ray observations, Bolocam thermal Sunyaev-Zel'dovich (SZ) effect observations, Hubble Space Telescope (HST) strong lensing data, and HST and Subaru Suprime-Cam weak lensing data. The multiwavelength dataset is used to constrain parametric models for the distribution of dark and baryonic matter in [...]
Mon, Dec 19, 2016
Source: CiteULike Group Cosmo LUTH
The Astrophysical Journal, Vol. 822, No. 1. (16 Dec 2016), 41, doi:10.3847/0004-637x/822/1/41We use N-body simulations to quantify how the escape velocity in cluster-sized halos maps to the gravitational potential in a LambdaCDM universe. Using spherical density-potential pairs and the Poisson equation, we find that the matter density inferred gravitational potential [...]
Mon, Dec 19, 2016
Source: CiteULike Group Cosmo LUTH
(16 Dec 2016)Ongoing and future spectroscopic surveys will measure numerous galaxy redshifts within tens of thousands of galaxy clusters. However, the sampling within these clusters will be low, 15 < N < 50 per cluster. With such data, it will be difficult to achieve accurate and precise mass estimates for [...]
Mon, Dec 19, 2016
Source: CiteULike Group Cosmo LUTH
(15 Dec 2016)For the first time, we present the size evolution of a mass-complete (log(M*/Msol)>10) sample of star-forming galaxies over redshifts z=1-7, selected from the FourStar Galaxy Evolution Survey (ZFOURGE). Observed H-band sizes are measured from the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CANDELS) Hubble Space Telescope (HST)/F160W imaging. [...]
Mon, Dec 19, 2016
Source: CiteULike Group Cosmo LUTH
(15 Dec 2016)The stellar initial mass function (IMF), which is often assumed to be universal across unresolved stellar populations, has recently been suggested to be "bottom-heavy" for massive ellipticals. In these galaxies, the prevalence of gravity-sensitive absorption lines (e.g. Na I and Ca II) in their near-IR spectra implies an [...]
Fri, Dec 16, 2016
Source: CiteULike Group Cosmo LUTH
(14 Dec 2016)The baryon acoustic oscillation (BAO) feature provides an important distance scale for the measurement of the expansion history of the Universe. Theoretical models of the BAO in the distribution of biased tracers of the large scale structure usually rely on an initially linear BAO. With aid of N-body [...]
Thu, Dec 15, 2016
Source: CiteULike Group Cosmo LUTH
(12 Dec 2016)Based on the Roe solver a new technique that allows to correctly represent low Mach number flows with a discretization of the compressible Euler equations was proposed in Miczek et al.: New numerical solver for flows at various mach numbers. A&A 576, A50 (2015). We analyze properties of [...]
Wed, Dec 14, 2016
Source: CiteULike Group Cosmo LUTH
Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 3. (19 Dec 2016), pp. 2547-2559, doi:10.1093/mnras/stw3192Verlinde (2016) proposed that the observed excess gravity in galaxies and clusters is the consequence of Emergent Gravity (EG). In this theory the standard gravitational laws are modified on galactic and larger scales due [...]
Tue, Dec 13, 2016
Source: CiteULike Group Cosmo LUTH
(5 Dec 2016)We provide an holistic view of galaxy evolution at high redshift z>4, that incorporates the constraints from various astrophysical/cosmological probes, including the estimate of the cosmic SFR density from UV/IR surveys and long GRB rates, the cosmic reionization history after the latest Planck measurements, and the missing satellites [...]
Tue, Dec 06, 2016
Source: CiteULike Group Cosmo LUTH
(1 Dec 2016)Evidence for gas accretion onto galaxies can be found throughout the universe. In this chapter, I summarize the direct and indirect signatures of this process and discuss the primary sources. The evidence for gas accretion includes the star formation rates and metallicities of galaxies, the evolution of the [...]
Mon, Dec 05, 2016
Source: CiteULike Group Cosmo LUTH
(1 Dec 2016)In this chapter, we review the role of gas accretion to the acquisition of angular momentum, both in galaxies and in their gaseous halos. We begin by discussing angular momentum in dark matter halos, with a brief review of tidal torque theory and the importance of mergers, followed [...]
Mon, Dec 05, 2016
Source: CiteULike Group Cosmo LUTH
(29 Nov 2016)Using a suite of three large cosmological hydrodynamical simulations, Horizon-AGN, Horizon-noAGN (no AGN feedback) and Horizon-DM (no baryons), we investigate how a typical sub-grid model for AGN feedback affects the evolution of the inner density profiles of massive dark matter haloes and galaxies. Based on direct object-to-object comparisons, [...]
Thu, Dec 01, 2016
Source: CiteULike Group Cosmo LUTH
(29 Nov 2016)We present the exact solutions for the collapse of a spherically-symmetric, cold (i.e., pressureless) cloud under its own self-gravity, valid for arbitrary initial density profiles and not restricted to the realm of self-similarity. These solutions exhibit a number of remarkable features, including the self-consistent formation of and subsequent [...]
Thu, Dec 01, 2016
Source: CiteULike Group Cosmo LUTH
(28 Nov 2016)We present the first determination of the galaxy luminosity function (LF) at z~4, 5, 6 and 7 in the rest-frame optical at lambda_rest~900 nm (z' band). The rest-frame optical light traces the content in low-mass evolved stars (~stellar mass - Mstar), minimizing potential biases affecting measurements of Mstar: [...]
Wed, Nov 30, 2016
Source: CiteULike Group Cosmo LUTH
(25 Nov 2016)We revisit the massive isolated elliptical galaxy / fossil group NGC 6482 for which previous X-ray studies of a modest Chandra observation obtained a very uncertain, but also possibly very high, halo concentration. We present new measurements of the hot gas surface brightness, temperature, and iron abundance using [...]
Tue, Nov 29, 2016
Source: CiteULike Group Cosmo LUTH
(11 Nov 2016)We present an HST/ACS weak gravitational lensing analysis of 13 massive high-redshift (z_median=0.88) galaxy clusters discovered in the South Pole Telescope (SPT) Sunyaev-Zel'dovich Survey. This study is part of a larger campaign that aims to robustly calibrate mass-observable scaling relations over a wide range in redshift to enable [...]
Tue, Nov 15, 2016
Source: CiteULike Group Cosmo LUTH
(11 Nov 2016)New photometric and long-slit spectroscopic observations are presented for NGC 7113, PGC 1852, and PGC 67207, which are three bright galaxies residing in low density environments. The surface-brightness distribution is analysed from K_S-band images taken with adaptive optics at the Gemini North Telescope and ugriz-band images from the [...]
Tue, Nov 15, 2016
Source: CiteULike Group Cosmo LUTH
(11 Nov 2016)Galaxies that have fallen into massive haloes may no longer be able to accrete gas from their surroundings, a process referred to as 'starvation' or 'strangulation' of satellites. We study the environmental dependence of gas accretion onto galaxies using the cosmological, hydrodynamical EAGLE simulation. We quantify the dependence [...]
Tue, Nov 15, 2016
Source: CiteULike Group Cosmo LUTH
(8 Nov 2016)Recent observations have shown that the scatter in opacities among coeval segments of the Lyman-alpha forest increases rapidly at z > 5. In this paper, we assess whether the large scatter can be explained by fluctuations in the ionizing background in the post-reionization intergalactic medium. We find that [...]
Thu, Nov 10, 2016
Source: CiteULike Group Cosmo LUTH
(12 Jun 2015)In this paper, we present the first results from the Renaissance Simulations, a suite of extremely high-resolution and physics-rich AMR calculations of high redshift galaxy formation performed on the Blue Waters supercomputer. These simulations contain hundreds of well-resolved galaxies at $z ∼ 25-8$, and make several novel, testable [...]
Mon, Nov 07, 2016
Source: CiteULike Group Cosmo LUTH
(31 Oct 2016)N-body dark matter simulations of structure formation in the $Λ$CDM model predict a population of subhalos within Galactic halos that have higher central densities than inferred for satellites of the Milky Way, a tension known as the `too big to fail' problem. Proposed solutions include baryonic effects, a [...]
Wed, Nov 02, 2016
Source: CiteULike Group Cosmo LUTH
(31 Oct 2016)We study galaxy formation in sterile neutrino dark matter models that differ significantly from both cold and from `warm thermal relic' models. We use the EAGLE code to carry out hydrodynamic simulations of the evolution of pairs of galaxies chosen to resemble the Local Group, as part of [...]
Wed, Nov 02, 2016
Source: CiteULike Group Cosmo LUTH
(28 Oct 2016)No explanation exists so far for the observed dearth of dwarf galaxies in the local universe compared to the large number of dark matter halos predicted by $Λ$CDM. Although attempts have been made to attribute the discrepancy to observational systematics, this would require an extreme modification of the [...]
Mon, Oct 31, 2016
Source: CiteULike Group Cosmo LUTH
(28 Oct 2016)Intensity mapping is now becoming a useful tool to study the large-scale structure of the universe through spatial variations in the integrated emission from galaxies and the intergalactic medium. We study intensity mapping of the H-alpha6563A, [OIII]5007A, [OII]3727A and H-beta4861A lines at 0.8 [...]
Mon, Oct 31, 2016
Source: CiteULike Group Cosmo LUTH
(27 Oct 2016)The survival of dust grains in galaxies depends on various processes. Dust can be produced in stars, it can grow in the interstellar medium and be destroyed by astration and interstellar shocks. In this paper, we assemble a few data samples of local and distant star-forming galaxies to [...]
Mon, Oct 31, 2016
Source: CiteULike Group Cosmo LUTH
(19 Oct 2016)The large-scale structure of the universe can only be observed directly via luminous tracers of the underlying distribution of dark matter. However, the clustering statistics of tracers are biased and depend on various properties of the tracers themselves, such as their host-halo mass and formation and assembly history. [...]
Fri, Oct 21, 2016
Source: CiteULike Group Cosmo LUTH
(14 Oct 2016)We study the mass accretion histories (MAHs) and density profiles of dark matter halos using N-body simulations of self-similar gravitational clustering from scale-free power spectra, $P(k)∝ k^n$. We pay particular attention to the density profile curvature, which we characterize using the shape parameter, $α$, of an Einasto profile. [...]
Tue, Oct 18, 2016
Source: CiteULike Group Cosmo LUTH
(14 Oct 2016)The kinematics and stellar populations of the low-mass nearby S0 galaxy NGC 5102 are studied from integral field spectra taken with the Multi-Unit Spectroscopic Explorer (MUSE). The kinematic maps reveal for the first time that NGC 5102 has the characteristic 2 sigma peaks indicative of galaxies with counter-rotating [...]
Mon, Oct 17, 2016
Source: CiteULike Group Cosmo LUTH
(13 Oct 2016)In low-mass galaxies, stellar feedback can drive gas outflows that generate non-equilibrium fluctuations in the gravitational potential. Using cosmological zoom-in baryonic simulations from the Feedback in Realistic Environments (FIRE) project, we investigate how these fluctuations affect stellar kinematics and the reliability of Jeans dynamical modeling in low-mass galaxies. [...]
Mon, Oct 17, 2016
Source: CiteULike Group Cosmo LUTH
(12 Oct 2016)Galaxy mergers are believed to trigger strong starbursts. This is well assessed by observations in the local Universe. However the efficiency of this mechanism has poorly been tested so far for high redshift, actively star forming, galaxies. We present a suite of pc-resolution hydrodynamical numerical simulations to compare [...]
Fri, Oct 14, 2016
Source: CiteULike Group Cosmo LUTH
(12 Oct 2016)The observed evolution of the gas fraction and its associated depletion time in main sequence (MS) galaxies provides insights on how star formation proceeds over cosmic time. We report ALMA detections of the rest-frame $∼$300$μ$m continuum observed at 240 GHz for 45 massive ($ \langle log(M_∗(M_odot))\rangle=10.7$), normal star [...]
Thu, Oct 13, 2016
Source: CiteULike Group Cosmo LUTH
(11 Oct 2016)Recent spatially resolved observations of galaxies at z=0.6-3 reveal that high-redshift galaxies show complex kinematics and a broad distribution of gas-phase metallicity gradients. To understand these results, we use a suite of high-resolution cosmological zoom-in simulations from the Feedback in Realistic Environments (FIRE) project, which include physically motivated [...]
Thu, Oct 13, 2016
Source: CiteULike Group Cosmo LUTH