Arxiv Papers

Last entries in the CiteULike library

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

Earlier
(19 Sep 2017)Primordial black holes (PBHs) have long been a candidate for the elusive dark matter (DM), and remain poorly constrained in the ~20-100 Msun mass range. PBH binaries were recently suggested as the possible source of LIGO's first detections. In this paper, we thoroughly revisit existing estimates of the [...]
Thu, Sep 21, 2017
Source: CiteULike Group Cosmo LUTH
(19 Sep 2017)Using few-body simulations, we investigate the evolution of supermassive black holes (SMBHs) in galaxies ($M_∗=10^10-10^12 M_odot$ at $z=0$) at $0 [...]
Wed, Sep 20, 2017
Source: CiteULike Group Cosmo LUTH
(28 Aug 2017)We present a technique for constructing suitable posterior probability distributions in situations for which the sampling distribution of the data is not known. This is very useful for modern scientific data analysis in the era of "big data", for which exact likelihoods are commonly either unknown, computationally prohibitively [...]
Wed, Aug 30, 2017
Source: CiteULike Group Cosmo LUTH
(28 Aug 2017)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 $3.7 10^11 \; h^-1 \mathrmM_odot - 5.0 [...]
Wed, Aug 30, 2017
Source: CiteULike Group Cosmo LUTH
(24 Aug 2017)The relation between a cosmological halo concentration and its mass (cMr) is a powerful tool to constrain cosmological models of halo formation and evolution. On the scale of galaxy clusters the cMr has so far been determined mostly with X-ray and gravitational lensing data. The use of independent [...]
Fri, Aug 25, 2017
Source: CiteULike Group Cosmo LUTH
(21 Aug 2017)We describe an OctTree algorithm for the MPI-parallel, adaptive mesh-refinement code \sc FLASH, which can be used to calculate the gas self-gravity, and also the angle-averaged local optical depth, for treating ambient diffuse radiation. The algorithm communicates to the different processors only those parts of the tree that [...]
Tue, Aug 22, 2017
Source: CiteULike Group Cosmo LUTH
(16 Aug 2017)Interpreting the small-scale clustering of galaxies with halo models can elucidate the connection between galaxies and dark matter halos. Unfortunately, the modelling is typically not sufficiently accurate for ruling out models in a statistical sense. It is thus difficult to use the information encoded in small scales to [...]
Thu, Aug 17, 2017
Source: CiteULike Group Cosmo LUTH
(24 Jul 2017)We present a new method to quantify the value of the escape fraction of ionizing photons, and the existence of ultra-faint galaxies clustered around brighter objects during the epoch of cosmic reionization, using the diffuse Ly$α$, continuum and H$α$ emission observed around galaxies at $z∼6$. We model the [...]
Wed, Jul 26, 2017
Source: CiteULike Group Cosmo LUTH
(24 Jul 2017)We study the impact of attractive self-interactions on the nonequilibrium dynamics of relativistic quantum fields with large occupancies at low momenta. Our primary focus is on Bose-Einstein condensation and nonthermal fixed points in such systems. As a model system we consider O(N)-symmetric scalar field theories. We use classical-statistical [...]
Wed, Jul 26, 2017
Source: CiteULike Group Cosmo LUTH
(22 Jul 2017)Active Galactic Nuclei (AGN) are energetic astrophysical sources powered by accretion onto supermassive black holes in galaxies, and present unique observational signatures that cover the full electromagnetic spectrum over more than twenty orders of magnitude in frequency. The rich phenomenology of AGN has resulted in a large number [...]
Tue, Jul 25, 2017
Source: CiteULike Group Cosmo LUTH
(21 Jul 2017)We investigate self-shielding of intergalactic hydrogen against ionizing radiation in radiative transfer simulations of cosmic reionization carefully calibrated with Lyman alpha forest data. While self-shielded regions manifest as Lyman-limit systems in the post-reionization Universe, here we focus on their evolution during reionization (redshifts z=6-10). At these redshifts, the [...]
Mon, Jul 24, 2017
Source: CiteULike Group Cosmo LUTH
(20 Jul 2017)We examine the impact of baryon acoustic oscillation (BAO) scale measurements on the discrepancy between the value of the Hubble constant ($H_0$) inferred from the local distance ladder and from Planck cosmic microwave background (CMB) data. While the BAO data alone cannot constrain $H_0$, we show that combining [...]
Fri, Jul 21, 2017
Source: CiteULike Group Cosmo LUTH
(20 Jul 2017)We perform a combined analysis of cosmic shear tomography, galaxy-galaxy lensing tomography, and redshift-space multipole power spectra (monopole and quadrupole) using 450 deg$^2$ of imaging data by the Kilo Degree Survey (KiDS) overlapping with two spectroscopic surveys: the 2-degree Field Lensing Survey (2dFLenS) and the Baryon Oscillation Spectroscopic [...]
Fri, Jul 21, 2017
Source: CiteULike Group Cosmo LUTH
(19 Jul 2017)The existence of two kinematically and chemically distinct stellar subpopulations in the Sculptor and Fornax dwarf galaxies offers the opportunity to constrain the density profile of their matter haloes by measuring the mass contained within the well-separated half-light radii of the two metallicity subpopulations. Walker and Pearrubia have [...]
Fri, Jul 21, 2017
Source: CiteULike Group Cosmo LUTH
(17 Jul 2017)We describe the structure and implementation of a moving-mesh hydrodynamics solver in the large-scale parallel code, Charm N-body GrAvity solver (ChaNGa). While largely based on the algorithm described by Springel (2010) that is implemented in AREPO, our algorithm differs a few aspects. We describe our use of the [...]
Wed, Jul 19, 2017
Source: CiteULike Group Cosmo LUTH
(18 Jul 2017)We reexamine interactions between the dark sectors of cosmology, with a focus on robust constraints that can be obtained using only mildly nonlinear scales. While it is well known that couplings between dark matter and dark energy can be constrained to the percent level when including the full [...]
Wed, Jul 19, 2017
Source: CiteULike Group Cosmo LUTH
(17 Jul 2017)We study optical light curve(LC) relations of type Ia supernovae(SNe~Ia) for their use in cosmology using high-quality photometry published by the Carnegie-Supernovae-Project (CSP-I). We revisit the classical luminosity-decline-rate ($Δ m_15$) relation and the Lira-relation, as well as investigate the time evolution of the ($B-V$) color and $B(B-V)$, which [...]
Wed, Jul 19, 2017
Source: CiteULike Group Cosmo LUTH
Annual Review of Astronomy and Astrophysics, Vol. 55, No. 1. (13 Jul 2017), doi:10.1146/annurev-astro-091916-055313The dark energy plus cold dark matter ($Λ$CDM) cosmological model has been a demonstrably successful framework for predicting and explaining the large-scale structure of Universe and its evolution with time. Yet on length scales smaller than $∼ [...]
Mon, Jul 17, 2017
Source: CiteULike Group Cosmo LUTH
(13 Jul 2017)Here we present a full description of the integrated galaxy-wide initial mass function (IGIMF) theory in terms of the optimal sampling and compare it with available observations. Optimal sampling is the method we use to discretize the IMF into stellar masses deterministically. Evidence has been indicating that nature [...]
Mon, Jul 17, 2017
Source: CiteULike Group Cosmo LUTH
(7 Jul 2017)We study the dependence of galaxy clustering on atomic gas mass using a sample of $∼$16,000 galaxies with redshift in the range of $0.0025 [...]
Mon, Jul 10, 2017
Source: CiteULike Group Cosmo LUTH
(6 Jul 2017)In this paper, the third in the series, we continue our study of combinatorics in chaotic Newtonian dynamics. We study the chaotic four-body problem in Newtonian gravity assuming finite-sized particles, and we focus on interactions that produce direct collisions between any two stars. Our long-term goal is to [...]
Mon, Jul 10, 2017
Source: CiteULike Group Cosmo LUTH
(20 Jun 2017)We present a suite of cosmological zoom-in simulations at z>5 from the Feedback In Realistic Environments project, spanning a halo mass range M_halo~10^8-10^12 M_sun at z=5. We predict the stellar mass-halo mass relation, stellar mass function, and luminosity function in several bands from z=5-12. The median stellar mass-halo [...]
Thu, Jun 22, 2017
Source: CiteULike Group Cosmo LUTH
(9 Jun 2017)Mysterious dark matter constitutes about 85% of all mass in the Universe. Clustering of dark matter plays the dominant role in the formation of all observed structures on scales from a fraction to a few hundreds of Mega-parsecs. Galaxies play a role of lights illuminating these structures so [...]
Wed, Jun 14, 2017
Source: CiteULike Group Cosmo LUTH
(6 Jun 2017)The one-point probability distribution function (PDF) of the matter density field in the universe is a fundamental property that plays an essential role in cosmology for estimates such as gravitational weak lensing, non-linear clustering, massive production of mock galaxy catalogs, and testing predictions of cosmological models. Here we [...]
Thu, Jun 08, 2017
Source: CiteULike Group Cosmo LUTH
Monthly Notices of the Royal Astronomical Society, Vol. 469, No. 1. (6 Jun 2017), pp. 347-382, doi:10.1093/mnras/stx689We have selected a sample of 41 extremely isolated galaxies (EIGs) from the local universe using both optical and HI ALFALFA redshifts (Spector & Brosch 2016). Narrow band H$_α$ and wide band imaging along [...]
Thu, Jun 08, 2017
Source: CiteULike Group Cosmo LUTH
(6 Jun 2017)The faster light-curve evolution of low-luminosity Type Ia supernovae (SNe Ia) suggests that they could result from the explosion of white dwarf (WD) progenitors below the Chandrasekhar mass ($M_ Ch$). Here we present 1D non-LTE time-dependent radiative transfer simulations of pure central detonations of carbon-oxygen WDs with a [...]
Thu, Jun 08, 2017
Source: CiteULike Group Cosmo LUTH
(31 May 2017)We implement and test the exact time integration method proposed by Townsend 2009 for gas cooling in cosmological hydrodynamic simulations. The errors using this time integrator for the internal energy are limited by the resolution of the cooling tables and are insensitive to the size of the timestep, [...]
Fri, Jun 02, 2017
Source: CiteULike Group Cosmo LUTH
Monthly Notices of the Royal Astronomical Society (25 May 2017), doi:10.1093/mnras/stx1300We perform controlled N-body simulations of disc galaxies growing within live dark matter (DM) haloes to present-day galaxies that contain both thin and thick discs. We consider two types of models: a) thick disc initial conditions to which stars on [...]
Fri, May 26, 2017
Source: CiteULike Group Cosmo LUTH
(25 May 2017)We have developed a semi-analytic framework to model the large-scale evolution of the first Population III (Pop III) stars and the transition to Population II (Pop II) star formation. Our model follows dark matter halos from cosmological N-body simulations, utilizing their individual merger histories and three-dimensional positions, and [...]
Fri, May 26, 2017
Source: CiteULike Group Cosmo LUTH
(23 May 2017)We measure how the properties of star-forming central galaxies correlate with large-scale environment, $δ$, measured on $10$Mpc/h scales. We use group catalogs to isolate a robust sample of central galaxies with high purity and completeness. The properties we investigate are star formation rate (SFR), exponential disk scale length [...]
Thu, May 25, 2017
Source: CiteULike Group Cosmo LUTH
(15 May 2017)We present EMERGE, an Empirical ModEl for the foRmation of GalaxiEs, describing the evolution of individual galaxies in large volumes from $z∼10$ to the present day. We assign a star formation rate to each dark matter halo based on its growth rate, which specifies how much baryonic material [...]
Wed, May 17, 2017
Source: CiteULike Group Cosmo LUTH
(10 May 2017)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 high precision and interpreting clustering measurements. As the name suggests, different [...]
Fri, May 12, 2017
Source: CiteULike Group Cosmo LUTH
(7 May 2017)The large-scale matter distribution in the late-time Universe exhibits gravity-induced non-Gaussianity, and the bispectrum, three-point cumulant is expected to contain significant cosmological information. In particular, the measurement of the bispectrum helps to tighten the constraints on dark energy and modified gravity through the redshift-space distortions (RSD). In this [...]
Tue, May 09, 2017
Source: CiteULike Group Cosmo LUTH
(1 May 2017)The standard Halo Occupation Distribution (HOD) models were originally developed based on results from semi-analytic and hydrodynamical galaxy formation models. Those models have since progressed, in particular to include AGN feedback to match the galaxy luminosity function in a universe with the observed baryon fraction. AGN feedback affects [...]
Mon, May 08, 2017
Source: CiteULike Group Cosmo LUTH
(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