Matthias Bartelmann
A5051244430- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Advanced Thermodynamics and Statistical Mechanics
- Dark Matter and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Relativity and Gravitational Theory
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Physics and Engineering Research Articles
- Quantum Mechanics and Applications
- Black Holes and Theoretical Physics
- Astronomical Observations and Instrumentation
- Quantum and Classical Electrodynamics
- Experimental and Theoretical Physics Studies
- Spectroscopy and Laser Applications
- History and advancements in chemistry
Heidelberg Institute for Theoretical Studies
2014-2024
Heidelberg University
2015-2024
Heidelberg University
2007-2023
Max Planck Society
1993-2019
Max Planck Institute for Astrophysics
2003-2019
Heidelberg (Poland)
2018
Leiden University
2012-2015
German Cancer Research Center
2006
University of Bologna
2004
Osservatorio astronomico di Bologna
2004
HEALPix -- the Hierarchical Equal Area iso-Latitude Pixelization is a versatile data structure with an associated library of computational algorithms and visualization software that supports fast scientific applications executable directly on very large volumes astronomical area surveys in form discretized spherical maps. Originally developed to address processing analysis needs present generation cosmic microwave background (CMB) experiments (e.g. BOOMERanG, WMAP), can be expanded meet many...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere collect spectra ≈106 galaxies, 100,000 quasars, 30,000 stars, serendipity targets. In 2001 June, SDSS released to general astronomical community its early data release, roughly 462 deg2 including almost 14 million detected objects 54,008 follow-up spectra. were collected in drift-scan mode five bandpasses (u, g, r, i, z); our 95% completeness...
The ESA's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14 May 2009 has been scanning microwave submillimetre sky continuously since 12 August 2009. This paper gives an overview of mission performance, processing, analysis, characteristics data, scientific results, science data products papers in release. include maps CMB diffuse extragalactic foregrounds, a catalogue compact Galactic sources, list sources detected through SZ effect....
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit multi-cycle treasury program to use the gravitational lensing properties of 25 galaxy clusters accurately constrain their mass distributions. survey, described in detail this paper, will definitively establish degree concentration dark matter cluster cores, key prediction CDM. CLASH sample larger and less biased than current samples space-based imaging studies similar depth, as we have minimized lensing-based...
We describe the all-sky Planck catalogue of clusters and cluster candidates derived from Sunyaev--Zeldovich (SZ) effect detections using first 15.5 months satellite observations. The contains 1227 entries, making it over six times size Early SZ (ESZ) sample largest SZ-selected to date. It 861 confirmed clusters, which 178 have been as mostly through follow-up observations, a further 683 are previously-known clusters. remaining 366 status candidates, we divide them into three classes...
Gravitational lensing has developed into one of the most powerful tools for analysis dark universe. This review summarises theory gravitational lensing, its main current applications and representative results achieved so far. It two parts. In first, starting from equation geodesic deviation, equations thin extended are derived. second, by stars planets, galaxies, galaxy clusters large-scale structures is discussed summarised.
The European Space Agency's <i>Planck<i/> satellite, launched on 14 May 2009, is the third-generation space experiment in field of cosmic microwave background (CMB) research. It will image anisotropies CMB over whole sky, with unprecedented sensitivity ( ~ 2 × 10<sup>-6<sup/>) and angular resolution (~5 arcmin). provide a major source information relevant to many fundamental cosmological problems test current theories early evolution Universe origin structure. also address wide range areas...
We present the first all-sky sample of galaxy clusters detected blindly by Planck satellite through Sunyaev-Zeldovich (SZ) effect from its six highest frequencies. This early SZ (ESZ) is comprised 189 candidates, which have a high signal-to-noise ratio ranging 6 to 29. Its reliability (purity above 95%) further ensured an extensive validation process based on internal quality assessments and external cross-identification follow-up observations. provides measured signal for about 80% 169...
Growing observational evidence now indicates that nebular line emission has a significant impact on the rest-frame optical fluxes of z~5-7 galaxies observed with Spitzer. This makes appear more massive, lower specific star formation rates. However, corrections for this have been very difficult to perform reliably due huge uncertainties overall strength such at z>~5.5. Here, we present most direct yet ubiquitous high-EW [OIII]+Hbeta in Lyman-break z~7, while also presenting strategy an...
We study the concentration parameters, their mass dependence and redshift evolution, of dark-matter halos in different dark-energy cosmologies with constant time-variable equation state, compare them "standard" ΛCDM OCDM models. find that previously proposed algorithms for predicting halo concentrations can be well adapted to When centred on analytically expected values, show a log-normal distribution uniform standard deviation ~0.2. The averaged permits simple fit form , throughout. cluster...
We use cosmological magneto-hydrodynamic simulations to study the evolution of magnetic fields in galaxy clusters two different models, a standard-CDM and Λ-CDM model. show that field strength profiles closely follow cluster density outside core region radius ~. The has correlation length order reverses on scales ~ along typical lines-of-sight. power spectrum can well be approximated by steep law with an exponent ~-2.7. mean cores grows roughly exponentially decreasing redshift, . Merger...
The Planck High Frequency Instrument (HFI) is designed to measure the temperature and polarization anisotropies of Cosmic Microwave Background galactic foregrounds in six wide bands centered at 100, 143, 217, 353, 545 857 GHz an angular resolution 10' (100 GHz), 7' (143 5' (217 higher). HFI has been operating flawlessly since launch on 14 May 2009. bolometers cooled 100 mK as planned. settings readout electronics, such bolometer bias current, that optimize HFI's noise performance orbit are...
We perform a strong-lensing analysis of the merging galaxy cluster MACS J0416.1-2403 (M0416; z=0.42) in recent CLASH/HST observations. identify 70 new multiple images and candidates 23 background sources range 0.7<z_{phot}<6.14 including two probable high-redshift dropouts, revealing highly elongated lens with axis ratio ~5:1, major ~100\arcsec (z_{s}~2). Compared to other well-studied clusters, M0416 shows an enhanced lensing efficiency. Although critical area is not particularly large...
We present precise Sunyaev-Zeldovich (SZ) effect measurements in the direction of 62 nearby galaxy clusters (z <0.5) detected at high signal-to-noise first Planck all-sky dataset. The sample spans approximately a decade total mass, 10^14 < M_500 10^15, where is mass corresponding to density contrast 500. Combining these quality with deep XMM-Newton X-ray data, we investigate relations between D_A^2 Y_500, integrated Compton parameter due SZ effect, and X-ray-derived gas M_g,500, temperature...
We present an 8 σ detection of cosmic magnification measured by the variation quasar density due to gravitational lensing foreground large-scale structure. To make this measurement we used 3800 deg2 photometric observations from Sloan Digital Sky Survey (SDSS) containing ~200,000 quasars and 13 million galaxies. Our galaxy-quasar cross-correlation function exhibits amplitude, angular dependence, change in sign as a slope observed number counts that is expected bias weak lensing. show...
We utilise a two-color Lyman-Break selection criterion to search for z~9-10 galaxies over the first 19 clusters in CLASH program. A systematic yields three candidates. While we have already reported most robust of these candidates, MACS1149-JD, two additional z~9 candidates are also found and H_{160}-band magnitudes ~26.2-26.9. careful assessment various sources contamination suggests <~1 contaminants our selection. To determine implications results LF SFR density at z~9, introduce new...
We present a new determination of the concentration–mass (c–M) relation for galaxy clusters based on our comprehensive lensing analysis 19 X-ray selected from Cluster Lensing and Supernova Survey with Hubble (CLASH). Our sample spans redshift range between 0.19 0.89. combine weak-lensing constraints Space Telescope (HST) ground-based wide-field data strong HST. The results are reconstructions surface-mass density all CLASH multi-scale grids. derivation Navarro–Frenk–White parameters yields...
We present results from a comprehensive lensing analysis in Hubble Space Telescope (HST) data of the complete Cluster Lensing And Supernova survey with cluster sample. identify previously undiscovered multiple images, allowing improved or first constraints on inner mass distributions and profiles. combine these strong weak shape measurements within HST field view (FOV) to jointly constrain distributions. The is performed two different common parameterizations (one adopts light-traces-mass...
We study the spherical collapse model for several dark-energy scenarios using fully non-linear differential equation evolution of density contrast within homogeneous overdensities derived from Newtonian hydrodynamics. While mathematically equivalent to more common approach based on radius perturbation, this has substantial conceptual as well numerical advantages. Among most important are that no singularities at early times appear, which avoids problems in particular applications cosmologies...
In this Letter, we study the implications of string Swampland criteria for dark energy in view ongoing and future cosmological observations. If theory should be ultimate quantum gravity theory, there is evidence that exact de Sitter solutions with a positive constant cannot describe fate late-time universe. Even though models given by scalar field $\pi$ evolving time are not direct tension they have to satisfy $|\Delta\pi|<d\sim\mathcal{O}(1)$ $|V'|/V>c\sim\mathcal{O}(1)$, where $V$...
All-sky data from the Planck survey and Meta-Catalogue of X-ray detected Clusters galaxies (MCXC) are combined to investigate relationship between thermal Sunyaev-Zeldovich (SZ) signal luminosity. The sample comprises ~ 1600 clusters with redshifts up 1 spans a wide range in SZ is extracted for each object individually, statistical significance measurement maximised by averaging bins luminosity, total mass, or redshift. at very high over more than two decades luminosity (10^43 erg/s < L_500...