A5077717776- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Molecular Spectroscopy and Structure
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Corrosion Behavior and Inhibition
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Concrete Corrosion and Durability
- Physics and Engineering Research Articles
- Fluid Dynamics Simulations and Interactions
University of Kassel
2025
Max Planck Institute for Extraterrestrial Physics
2015-2024
Ludwig-Maximilians-Universität München
2015-2024
Excellence Cluster Origins
2019-2024
Stuttgart Observatory
2013-2024
Adelwitz Technologiezentrum (Germany)
2024
Bayerische Staatssammlung für Paläontologie und Geologie
2009-2023
John Wiley & Sons (Germany)
2012-2023
München Klinik
2014-2023
Leibniz Institute for Astrophysics Potsdam
2018-2023
Recent observations indicate that dark matter halos have flat central density profiles. Cosmological simulations with nonbaryonic matter, however, predict self-similar cusps. This contradiction has lead to the conclusion must be baryonic. Here it is shown of dwarf spiral galaxies represent a one-parameter family The observed global halo parameters are coupled each other through simple scaling relations which can explained by standard cold model if one assumes all formed from fluctuations...
We use the first systematic data sets of CO molecular line emission in z∼ 1–3 normal star-forming galaxies (SFGs) for a comparison dependence galaxy-averaged star formation rates on gas masses at low and high redshifts, different galactic environments. Although current high-z samples are still small biased towards luminous massive tail actively ‘main-sequence’, fairly clear picture is emerging. Independent whether galaxy-integrated quantities or surface densities considered, low- SFG...
We present PHIBSS, the IRAM Plateau de Bure high-z blue sequence CO 3-2 survey of molecular gas properties in normal star forming galaxies (SFGs) near cosmic formation peak. PHIBSS provides 52 detections two redshift slices at z~1.2 and 2.2, with log(M*(M_solar))>10.4 log(SFR(M_solar/yr))>1.5. Including a correction for incomplete coverage M*-SFR plane, we infer average fractions ~0.33 ~0.47 z~2.2. Gas drop stellar mass, agreement cosmological simulations including strong feedback. Most...
This paper provides an update of our previous scaling relations (Genzel et al.2015) between galaxy integrated molecular gas masses, stellar masses and star formation rates, in the framework main-sequence (MS), with main goal to test for possible systematic effects. For this purpose new study combines three independent methods determining from CO line fluxes, far-infrared dust spectral energy distributions, ~1mm photometry, a large sample 1444 forming galaxies (SFGs) z=0 4. The covers mass...
Cosmological simulations of galaxy formation appear to show a "two-phase" character with rapid early phase at z ≳ 2 during which "in situ" stars are formed within the from infalling cold gas followed by an extended since ≲ 3 "ex primarily accreted. In latter phase, massive systems grow considerably in mass and radius accretion smaller satellite stellar quite times (z>3) outside virial forming central galaxy. These tentative conclusions obtained high-resolution re-simulations 39 individual...
We combine molecular gas masses inferred from CO emission in 500 star-forming galaxies (SFGs) between z = 0 and 3, the IRAM-COLDGASS, PHIBSS1/2, other surveys, with derived Herschel far-IR dust measurements 512 galaxy stacks over same stellar mass/redshift range. constrain scaling relations of depletion timescale (tdepl) to mass ratio (Mmol gas/M*) SFGs near star formation "main-sequence" redshift, specific star-formation rate (sSFR), (M*). The CO- dust-based agree remarkably well. This...
We determine a new resolution requirement for the smoothed particle hydrodynamics (SPH) numerical method when self-gravity is included. Comparison calculations between an SPH code and Eulerian grid are performed. The of computationally demanding molecular cloud collapse fragmentation problem. demonstrate that results given by two different hydrodynamic methods in good agreement, so long as minimum resolvable mass always less than Jeans mass. If this criterion not satisfied, may give...
We present Hα integral field spectroscopy of well-resolved, UV/optically selected z ∼ 2 star-forming galaxies as part the SINS survey with SINFONI on ESO VLT. Our laser guide star adaptive optics and good seeing data show presence turbulent rotating outer rings/disks, plus central bulge/inner disk components, whose mass fractions relative to total dynamical appear scale [N II]/Hα flux ratio formation age. propose that buildup disks bulges massive at can be driven by early secular evolution...
We compute 3D models of supersonic, sub-Alfv\'enic, and super-Alfv\'enic decaying turbulence, with an isothermal equation state appropriate for star-forming interstellar clouds molecular gas. find that in the kinetic energy decays as ${t}^{\ensuremath{-}\ensuremath{\eta}}$, $0.85<\ensuremath{\eta}<1.2$. In 1D magnetized turbulence actually faster than unmagnetized turbulence. compared different algorithms, performed resolution studies reaching ${256}^{3}$ zones or ${70}^{3}$ particles....
We have studied the properties of giant star-forming clumps in five z ∼ 2 disks with deep SINFONI AO spectroscopy at ESO VLT. The reside disk regions where Toomre Q-parameter is below unity, consistent their being bound and having formed from gravitational instability. Broad Hα/[N ii] line wings demonstrate that are launching sites powerful outflows. inferred outflow rates comparable to or exceed star formation rates, one case by a factor eight. Typical may lose fraction original gas...
Accurately predicting the demographics of dark matter (DM) substructure is paramount importance for many fields astrophysics, including gravitational lensing, galaxy evolution, halo occupation modelling, and constraining nature DM. Because its strongly non-linear nature, DM typically modelled using N-body simulations, which reveal that large fractions subhaloes undergo complete disruption. In this paper, we use both analytical estimates idealized numerical simulations to investigate whether...
We use the first systematic samples of CO millimeter emission in z>1 'main-sequence' star forming galaxies (SFGs) to study metallicity dependence conversion factor {\alpha}CO, from line luminosity molecular gas mass. The depletion rate inferred ratio formation (SFR) luminosity, is ~1 Gyr-1 for near-solar with stellar masses above M_S~1e11 M_sun. In this regime does not vary more than a two three as function surface density, or redshift between z~0 and 2. Below M_S increases rapidly...
The evolution and distribution of the angular momentum dark matter (DM) halos have been discussed in several studies over past decades. In particular, idea arose that conservation should allow us to infer total entire DM halo from measuring baryonic component, which is populating center halo, especially for disk galaxies. To test this understand connection between its galaxy, we use a state-of-the-art, hydrodynamical cosmological simulation taken set Magneticum Pathfinder simulations. Thanks...
In this paper we follow up on our previous detection of nuclear ionized outflows in the most massive (log(M*/Msun) >= 10.9) z~1-3 star-forming galaxies (Forster Schreiber et al.), by increasing sample size a factor six (to 44 above log(M*/Msun) from combination SINS/zC-SINF, LUCI, GNIRS, and KMOS^3D spectroscopic surveys. We find fairly sharp onset incidence broad emission (FWHM Ha, [NII], [SII] lines ~ 450-5300 km/s), with large [NII]/Ha ratios, 10.9, about two thirds mass range exhibiting...
We present a census of ionized gas outflows in 599 normal galaxies at redshift 0.6<z<2.7, mostly based on integral field spectroscopy Ha, [NII], and [SII] line emission. The sample fairly homogeneously covers the main sequence star-forming with masses 9.0<log(M*/Msun)<11.7, probes into regimes quiescent starburst outliers. About 1/3 exhibits high-velocity component indicative outflows, roughly equally split winds driven by star formation (SF) active galactic nuclei (AGN). incidence SF-driven...
The energy injection through Hawking evaporation has been used to put strong constraints on primordial black holes as a dark matter candidate at masses below $10^{17}\,\rm{g}$. However, Hawking's semiclassical approximation breaks down latest after half-decay. Beyond this point, the could be significantly suppressed, was shown in recent work. In study, we review existing cosmological and astrophysical bounds holes, taking effect into account. We show that disappear completely for reasonable...
Abstract Recent observations with JWST and the Atacama Large Millimeter/submillimeter Array have revealed extremely massive quiescent galaxies at redshifts of z = 3 higher, indicating both rapid onset quenching star formation. Using cosmological simulation suite Magneticum Pathfinder, we reproduce observed number densities stellar masses, 36 quenched mass larger than × 10 M ⊙ 3.42. We find that these are through a burst formation subsequent active galactic nucleus (AGN) feedback caused by...
We investigate the structure of dark matter halos by means kinematics a very large sample spiral galaxies all luminosities. The observed rotation curves show universal profile which is sum an exponential thin disk term and spherical halo with flat density core. find that Burkert proposed to describe distribution dwarf also provides excellent mass model for around systems up 100 times more massive. Moreover, we core densities ρ0 radii r0 lie in same scaling relation = 4.5 × 10-2(r0/kpc)-2/3...
We perform a large parameter survey of 112 collisionless N-body simulations binary mergers disk-galaxies with mass ratios 1:1, 2:1, 3:1, and 4:1 using the special purpose hardware GRAPE. The basic properties remnants correlate ratio progenitor disks. find that about 80% equal-mass merger lead to slowly rotating significant minor-axis rotation. One half all projected 1:1 shows boxy other disky isophotes. Remnants 3:1 rotate fast show small amount About 90% 2:1 intermediate properties....
We present the modeling of SINFONI integral field dynamics 18 star forming galaxies at z ~ 2 from Halpha line emission. The are selected larger sample SINS survey, based on prominence ordered rotational motions with respect to more complex merger induced dynamics. quality data allows us carefully select systems kinematics dominated by rotation, and model gas across whole galaxy using suitable exponential disk models. obtain a good correlation between dynamical mass stellar mass, finding that...
We use the bulge Sérsic index n and bulge-to-total mass ratio (B/T) to explore fundamental question of how bulges form. perform two-dimensional bulge–disk–bar decomposition on H-band images 143 bright, high-mass (M⋆ ⩾ 1.0 × 1010M☉) low-to-moderately inclined (i < 70°) spirals. Our results are as follows. (1) bar fraction (∼58%) is consistent with that from ellipse fits. (2) 70% stellar in disks, 10% bars, 20% bulges. (3) A large (∼69%) bright spirals have B/T⩽ 0.2, ∼76% low ⩽ 2 These exist...