A5037478490- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Monetary Policy and Economic Impact
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Nuclear and radioactivity studies
- Sport and Mega-Event Impacts
- Nonprofit Sector and Volunteering
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Forecasting Techniques and Applications
- Sports, Gender, and Society
- Market Dynamics and Volatility
- Sociology and Education Studies
- German Economic Analysis & Policies
- Radioactive contamination and transfer
- Experimental Behavioral Economics Studies
- Additive Manufacturing Materials and Processes
- Groundwater flow and contamination studies
- Radio Astronomy Observations and Technology
- Graphite, nuclear technology, radiation studies
- Scientific Research and Discoveries
- Nuclear reactor physics and engineering
- Sports Analytics and Performance
Bundesgesellschaft für Endlagerung
2021-2024
Bernhard Nocht Institute for Tropical Medicine
2019-2023
University of Bremen
2022-2023
Airbus (France)
2023
University of Würzburg
2023
Walter de Gruyter (Germany)
2023
Forschungsgemeinschaft Werkzeuge und Werkstoffe
2023
Behörde für Schule und Berufsbildung
2023
Airbus (Germany)
2023
University of Göttingen
2010-2022
We study the formation and evolution of a sample Lyman Break Galaxies in Epoch Reionization by using high-resolution ($\sim 10 \,{\rm pc}$), cosmological zoom-in simulations part SERRA suite. In SERRA, we follow interstellar medium (ISM) thermo-chemical non-equilibrium evolution, perform on-the-fly radiative transfer radiation field (ISRF). The simulation outputs are post-processed to compute emission far infrared lines ([CII], [NII], [OIII]). At $z=8$, most massive galaxy, `Freesia', has an...
The recent discovery of dusty galaxies well into the Epoch Reionization (redshift z > 6) poses challenging questions about properties interstellar medium in these pristine systems. By combining state-of-the-art hydrodynamic and dust radiative transfer simulations, we address focusing on recently discovered galaxy A2744_YD4 (z = 8.38, Laporte et al.). We show that can reproduce observed spectral energy distribution (SED) only using different physical values with respect to inferred ones by...
ABSTRACT A tight relation between the [C ii] 158 $\mu$m line luminosity and star formation rate is measured in local galaxies. At high redshift (z > 5), though, a much larger scatter observed, with considerable (15–20 per cent) fraction of outliers being ii]-deficient. Moreover, surface brightness ($\Sigma_{\rm [C\, \small {II}]}$) these sources systematically lower than expected from relation. To clarify origin such ii]-deficiency, we have developed an analytical model that fits data has...
We study the kinematical properties of galaxies in Epoch Reionization via [CII] 158$\mu$m line emission. The profile provides information on kinematics as well structural such presence a disk and satellites. To understand how these are encoded profile, first we develop analytical models from which identify inclination gas turbulent motions key parameters affecting profile. gain further insights, use "Althaea", highly-resolved ($30\, \rm pc$) simulated prototypical Lyman Break Galaxy,...
We introduce SERRA, a suite of zoom-in high-resolution ($\sim 10\,\rm pc$) cosmological simulations including non-equilibrium chemistry and on-the-fly radiative transfer. The outputs are post-processed to derive galaxy UV+FIR continuum emission line properties. Results compared with available multi-wavelength data constrain the physical properties (e.g., star formation rates, stellar/gas/dust mass, metallicity) high-redshift $6 \lesssim z 15$ galaxies. This flagship paper focuses on $z=7.7$...
We investigate the radiative transfer of Lyman alpha photons through simplified anisotropic gas distributions, which represent physically motivated extensions popular 'shell-models'. Our study is by notion that (i) shell models do not always reproduce observed spectral line profiles, (ii) (typical) allow for escape ionizing photons, and (iii) observation & expectation winds are more complex, phenomena. examine influence inclination on spectra, relative fluxes fractions. find flux to be...
We derive the halo mass function (HMF) for fuzzy dark matter (FDM) by solving excursion set problem explicitly with a mass-dependent barrier function, which has not been done before. find that compared to naive approach of Sheth–Tormen HMF FDM, our higher cutoff and changes less strongly redshifts. Using merger trees constructed modified version Lacey & Cole formalism accounts suppressed small-scale power scale-dependent growth FDM haloes semi-analytic galacticus code, we study statistics...
The distinctive effects of fuzzy dark matter are most visible at nonlinear galactic scales. We present the first simulations mixed and cold matter, obtained with an extended version nyx code. Fuzzy (or ultralight or axionlike) dynamics governed by comoving Schr\"odinger-Poisson equation. This is evolved a pseudospectral algorithm on root grid, finite differencing up to six levels adaptive refinement. Cold existing $N$-body implementation in nyx. investigations spherical collapse models,...
We present the public release of MultiDark-Galaxies: three distinct galaxy catalogues derived from one Planck cosmology MultiDark simulations (i.e. MDPL2, with a volume (1 Gpc/$h$)$^{3}$ and mass resolution $1.5 \times 10^{9} M_{\odot}/h$) by applying semi-analytic models GALACTICUS, SAG, SAGE to it. compare their conformity observational data for selection fundamental properties galaxies like stellar function, star formation rate, cold gas fractions, metallicities - noting that they...
We study the CO line luminosity (LCO), shape of spectral energy distribution (SLED), and value CO-to-H2 conversion factor in galaxies Epoch Reionization (EoR). For this aim, we construct a model that simultaneously takes into account radiative transfer clumpy structure giant molecular clouds (GMCs) where lines are excited. then use it to post-process state-of-the-art zoomed, high resolution (30 pc), cosmological simulation main-sequence (M* ≈ 1010 M⊙, SFR 100 M⊙ yr− 1) galaxy, 'Althæa', at z...
ABSTRACT Extended Lyman alpha emission is now commonly detected around high-redshift galaxies through stacking and even on individual basis. Despite recent observational advances, the physical origin of these haloes (LAHs), as well their relationships to galaxies, quasars, circumgalactic gas, other environmental factors remains unclear. We present results from our new full radiative transfer code voroiltis which runs directly unstructured Voronoi tessellation cosmological hydrodynamical...
We compare the physical and morphological properties of z ~ 2 Lyman-alpha emitting galaxies (LAEs) identified in HETDEX Pilot Survey narrow band studies with those optical emission line (oELGs) via HST WFC3 infrared grism spectroscopy. Both sets extend over same range stellar mass (7.5 < logM 10.5), size (0.5 R 3.0 kpc), star-formation rate (~1 SFR 100). Remarkably, a comparison most commonly used parameters -- mass, half-light radius, UV slope, star formation rate, ellipticity, nearest...
We report the discovery of 10-kpc scale [CII] 158um halos surrounding star-forming galaxies in early Universe. choose deep ALMA data 18 each with a star-formation rate ~ 10-70 Msun no signature AGN whose lines are individually detected at z=5.153-7.142, and conduct stacking dust-continuum uv-visibility plane. The radial profiles surface brightnesses show halo 9.2sigma level significantly extended more than HST stellar continuum by factor ~5 on exponential-profile basis, as well dust...
We use a modified version of the Peak Patch excursion set formalism to compute mass and size distribution QCD axion miniclusters from fully non-Gaussian initial density field obtained numerical simulations string decay. find strong agreement with N-Body at significantly lower computational cost. employ spherical collapse model provide fitting functions for barrier in radiation era. The halo function $z=629$ has power-law $M^{-0.6}$ masses within range $10^{-15}\lesssim M\lesssim...
We present simulations of Lyman-Alpha radiation transfer in an isolated disk galaxy with a turbulence sub-grid model, multi-phase interstellar medium and detailed star formation modelling. investigate the influence inclination on observed properties for different snapshots. The Lyman-alpha spectrum, equivalent width distribution escape fractions vary significantly morphology disk, leading to variations from one snapshot another. In particular, we find that supernova-driven cavities near...
In the context of structure formation with ultralight axion dark matter, we offer an alternative explanation for mass relation solitonic cores and their host halos observed in numerical simulations. Our argument is based entirely on gain that occurs during major mergers binary largely independent initial core-halo assigned to hosts have just collapsed. We find a between halo ${M}_{h}$ corresponding core ${M}_{c}$, ${M}_{c}\ensuremath{\propto}{M}_{h}^{2\ensuremath{\beta}\ensuremath{-}1}$,...
The intrinsic strength of the Ly α line in young, star-forming systems makes it a special tool for studying high-redshift galaxies. However, interpreting observations remains challenging due to complex radiative transfer involved. Here, we combine state-of-the-art hydrodynamical simulations ‘Althæa’, prototypical Lyman Break Galaxy (LBG; stellar mass |$M_{\star }\simeq 10^{10}\, {\rm M}_{\odot }$|) at z = 7.2, with detailed computations dust/continuum, [C ii]158 |$\mu$|m, and clarify...
We study the structure of spatially resolved, line-of-sight velocity dispersion for galaxies in Epoch Reionization (EoR) traced by [CII] $158\mu\rm{m}$ line emission. Our laboratory is a simulated prototypical Lyman-break galaxy, "Freesia", part SERRA suite. The analysis encompasses redshift range 6 < z 8, when Freesia very active assembling phase. build maps three dynamically distinct evolutionary stages (Spiral Disk at z=7.4, Merger z=8.0, and Disturbed z=6.5) using hyperspectral data...
ABSTRACT We investigate the infrared (IR) emission of high-redshift (z ∼ 6), highly star-forming (${{\rm SFR}\gt 100\,{\rm M}_{\odot }\, {\rm yr}^{-1}}$) galaxies, with/without active galactic nuclei (AGN), using a suite cosmological simulations featuring dust radiative transfer. Synthetic spectral energy distributions (SEDs) are used to quantify relative contribution stars/AGN heating. In dusty (Md ≳ 3 × 107 M⊙) ≳50–90 per cent ultraviolet (UV) radiation is obscured by inhomogeneities on...
Abstract Purpose Human Borna disease virus (BoDV-1) encephalitis is an emerging in Germany. This study investigates the spectrum of human BoDV-1 infection, characterizes anti-BoDV-1-antibodies and kinetics, compares laboratory test performances. Methods Three hundred four cases, 308 nation-wide neuropsychiatric conditions, 127 well-defined psychiatric cases from disease-endemic areas, 20 persons with contact to patients or animals were tested for infections by serology PCR. Results only...
Lyman-$α$ emitters (LAEs) are a promising probe of the large-scale structure at high redshift, $z\gtrsim 2$. In particular, Hobby-Eberly Telescope Dark Energy Experiment aims observing LAEs 1.9 $
Zusammenfassung Für die Durchführung von Sicherheitsuntersuchungen im Rahmen des deutschen Standortauswahlverfahrens zur Suche nach einem Endlager für hochradioaktive Abfälle sind numerische Modelle ein wichtiges Instrument. Ihr Anwendungsbereich ist vielfältig und umfasst zum Beispiel Fragestellungen thermischen Auslegung Endlagers potenziellen Austrags radioaktiver Stoffe aus der Geosphäre. Numerische werden in vielen Branchen nutzbringend eingesetzt. Allerdings hat Aussagekraft Modellen...
Major mergers are considered to be a significant source of turbulence in clusters. We performed numerical simulation major merger event using nested-grid initial conditions, adaptive mesh refinement, radiative cooling primordial gas, and homogeneous ultraviolet background. By calculating the microscopic viscosity on basis various theoretical assumptions estimating Kolmogorov length from turbulent dissipation rate computed with subgrid-scale model, we able demonstrate that most warm-hot...
Abstract We contribute to recent research on the joint evaluation of properties macroeconomic forecasts in a multivariate setting. The specific property that we are interested is their efficiency. study efficiency by means random forests, which use model links between forecast errors and predictor variables forecaster's information set. then permutation tests whether Mahalanobis distance predicted for growth inflation four leading German economic institutes actual significantly smaller than...