Arxiv Papers

Last entries in the CiteULike library

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

Earlier
(13 Apr 2017)Using the latest cosmological hydrodynamic N-body simulations of groups and clusters, we study how location in phase-space coordinates at $z$$=$$0$ can provide information on environmental effects acting in clusters. We confirm the results of previous authors showing that galaxies tend to follow a typical path in phase-space as [...]
Mon, Apr 17, 2017
Source: CiteULike Group Cosmo LUTH
(11 Apr 2017)Massive quiescent galaxies are thought to have formed stars rapidly at early times followed by a long period of quiescence. The recent discovery of a massive quiescent galaxy, ZF-COSMOS-20115 at $z∼4$, only 1.5 Gyr after the Big Bang, places new constraints on galaxy growth and the role of [...]
Wed, Apr 12, 2017
Source: CiteULike Group Cosmo LUTH
(10 Apr 2017)Using a state-of-the-art cosmological simulation of merging proto-galaxies at high redshift from the FIRE project, with explicit treatments of star formation and stellar feedback in the interstellar medium, we investigate the formation of star clusters and examine one of the formation hypothesis of present-day metal-poor globular clusters. We [...]
Wed, Apr 12, 2017
Source: CiteULike Group Cosmo LUTH
(11 Apr 2017)We present the results of cosmological hydrodynamic simulations with zoom-in initial conditions, and investigate the formation of the first galaxies and their evolution towards observable galaxies at $z ∼ 6$. We focus on three different galaxies which end up in halos with masses $M_h = 2.4 10^10~h^-1\; M_odot$ [...]
Wed, Apr 12, 2017
Source: CiteULike Group Cosmo LUTH
(3 Apr 2017)The first billion years of the Universe is a pivotal time: stars, black holes (BHs) and galaxies form and assemble, sowing the seeds of galaxies as we know them today. Detecting, identifying and understand- ing the first galaxies and BHs is one of the current observational and theoretical [...]
Wed, Apr 05, 2017
Source: CiteULike Group Cosmo LUTH
Nature (24 Mar 2017), doi:10.1038/nature21677Recent observations have revealed massive galactic molecular outflows that may have physical conditions (high gas densities) required to form stars. Indeed, several recent models predict that such massive galactic outflows may ignite star formation within the outflow itself. This star-formation mode, in which stars form with [...]
Tue, Mar 28, 2017
Source: CiteULike Group Cosmo LUTH
(24 Mar 2017)We study the effect of density fluctuations induced by turbulence on the HI/H$_2$ structure in photodissociation regions (PDRs) both analytically and numerically. We perform magnetohydrodynamic numerical simulations for both subsonic and supersonic turbulent gas and chemical HI/H$_2$ balance calculations. We derive atomic-to-molecular density profiles and the HI column [...]
Tue, Mar 28, 2017
Source: CiteULike Group Cosmo LUTH
(24 Mar 2017)We report on SPT-CLJ2011-5228, a giant system of arcs created by a cluster at $z=1.06$. The arc system is notable for the presence of a bright central image. The source is a Lyman Break galaxy at $z_s=2.39$ and the mass enclosed within the 14 arc second radius Einstein [...]
Mon, Mar 27, 2017
Source: CiteULike Group Cosmo LUTH
Astronomy & Astrophysics (24 Mar 2017), doi:10.1051/0004-6361/201630149Rotation plays a key role in the star-formation process, from pre-stellar cores to pre-main-sequence (PMS) objects. Understanding the formation of massive stars requires taking into account the accretion of angular momentum during their PMS phase. We study the PMS evolution of objects destined to [...]
Mon, Mar 27, 2017
Source: CiteULike Group Cosmo LUTH
(24 Mar 2017)We study the properties of dark matter halos that contain star-forming galaxies at $1.43 ≤ z ≤ 1.74$ using the FMOS-COSMOS survey. The sample consists of 516 objects with a detection of the H$α$ emission line, that represent the star-forming population at this epoch having a stellar mass [...]
Mon, Mar 27, 2017
Source: CiteULike Group Cosmo LUTH
(7 Mar 2017)In warm dark matter scenarios structure formation is suppressed on small scales with respect to the cold dark matter case, reducing the number of low-mass halos and the fraction of ionized gas at high redshifts and thus, delaying reionization. This has an impact on the ionization history of [...]
Wed, Mar 08, 2017
Source: CiteULike Group Cosmo LUTH
(2 Mar 2017)We show that the phase of the spectrum of baryon acoustic oscillations (BAO) is immune to the effects of nonlinear evolution. This suggests that any new physics that contributes to the initial phase of the BAO spectrum, such as extra light species in the early universe, can be [...]
Fri, Mar 03, 2017
Source: CiteULike Group Cosmo LUTH
(24 Feb 2017)We propose a model for the density statistics in supersonic turbulence, which play a crucial role in star-formation and the physics of the interstellar medium (ISM). Motivated by [Hopkins, MNRAS, 430, 1880 (2013)], the model considers the density to be arranged into a collection of strong shocks of [...]
Tue, Feb 28, 2017
Source: CiteULike Group Cosmo LUTH
(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
Monthly Notices of the Royal Astronomical Society, Vol. 468, No. 1. (24 Mar 2017), pp. 122-139, doi:10.1093/mnras/stx420The 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 [...]
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