Observing the clustering properties of galaxy clusters in dynamical-dark energy cosmologies (2008)
Fedeli, C., Moscardini, L., Bartelmann, M.
We study the clustering properties of galaxy clusters expected to be observed by various forthcoming surveys both in the X-ray and sub-mm regimes through the thermal Sunyaev-Zel'dovich effect....
Combining weak and strong cluster lensing: Applications to simulations and MS 2137 (2008)
Merten, J., Cacciato, M., Meneghetti, M., Mignone, C., Bartelmann, M.
AIMS. While weak lensing cannot resolve cluster cores and strong lensing is almost insensitive to density profiles outside the scale radius, combinations of both effects promise to constrain density...
Effects of primordial chemistry on the cosmic microwave background (2008)
Schleicher, D. R. G., Galli, D., Palla, F., Camenzind, M., Klessen, R. S., Bartelmann, M., ...
Previous works have demonstrated that the generation of secondary CMB anisotropies due to the molecular optical depth is likely too small to be observed. In this paper, we examine additional ways in...
Strong lensing statistics and the power spectrum normalisation (2008)
Fedeli, C., Bartelmann, M., Meneghetti, M., Moscardini, L.
We use semi-analytic modelling of the galaxy-cluster population and its strong lensing efficiency to explore how the expected abundance of large gravitational arcs on the sky depends on $\sigma_8$....
Statistical properties of SZ and X-ray cluster detections (2008)
Pace, F., Maturi, M., Bartelmann, M., Cappelluti, N., Dolag, K., Meneghetti, M., ...
Aims. We calibrate the number density, completeness, reliability and the lower mass limit of galaxy-cluster detections through their thermal SZ signal, and compare them to X-ray cluster detections....
Statistical properties of SZ and X-ray cluster detections (2008)
Pace, F., Maturi, M., Bartelmann, M., Cappelluti, N., Dolag, K., Meneghetti, M., ...
Cosmic reionization in a dynamic quintessence cosmology (2007)
Crociani, D., Viel, M., Moscardini, L., Bartelmann, M., Meneghetti, M.
In this paper we investigate the effects that a dynamic dark energy component dominant in the universe at late epochs has on reionization. We follow the evolution of HII regions with the analytic...
Asymmetric Gravitational Lenses in TeVeS and Application to the Bullet Cluster (2007)
Feix, M., Fedeli, C., Bartelmann, M.
Aims: We explore the lensing properties of asymmetric matter density distributions in Bekenstein's Tensor-Vector-Scalar theory (TeVeS). Methods: Using an iterative Fourier-based solver for the...
Fedeli, C., Bartelmann, M., Meneghetti, M., Moscardini, L.
We use simulated merger trees of galaxy-cluster halos to study the effect of the halo concentration distribution on strong lensing and X-ray emission. Its log-normal shape typically found in...
Selection effects on X-ray and strong-lensing clusters in various cosmologies (2007)
Galaxy clusters are hotter and more X-ray luminous than in quiescence while they undergo major mergers, which also transiently increase their strong-lensing efficiency. We use semi-analytic models...
Gorski, K. M., Hivon, E., Banday, A. J ., Wandelt, B. D., Hansen, F. K., Reinecke, M., ...
In this paper we consider the requirements and implementation constraints on a framework that simultaneously enables an efficient discretization with associated hierarchical indexation and fast...
Arc sensitivity to cluster ellipticity, asymmetries and substructures (2007)
Meneghetti, M., Argazzi, R., Pace, F., Moscardini, L., Dolag, K., Bartelmann, M., ...
Testing the reliability of weak lensing cluster detections (2007)
Pace, F., Maturi, M., Meneghetti, M., Bartelmann, M., Moscardini, L., Dolag, K.
Reliable Shapelet Image Analysis (2006)
Melchior, P., Meneghetti, M., Bartelmann, M.
Aims: We discuss the applicability and reliability of the shapelet technique for scientific image analysis. Methods: We quantify the effects of non-orthogonality of sampled shapelet basis functions...
Maio, U., Dolag, K., Meneghetti, M., Moscardini, L., Yoshida, N., Baccigalupi, C., ...
We present the first hydrodynamic N-body simulations of primordial gas clouds responsible for the reionisation process in dark energy cosmologies. We compare the cosmological constant scenario with a...
Searching dark-matter halos in the GaBoDS survey (2006)
Maturi, M., Schirmer, M., Meneghetti, M., Bartelmann, M., Moscardini, L.
We apply the linear filter for the weak-lensing signal of dark-matter halos developed in Maturi et al. (2005) to the cosmic-shear data extracted from the Garching-Bonn-Deep-Survey (GaBoDS). We wish...
Effects of early dark energy on strong cluster lensing (2006)
We use the semi-analytic method developed by Fedeli et al. for computing strong-lensing optical depths to study the statistics of gravitational arcs in four dark-energy cosmologies. Specifically, we...
Smoothing Algorithms and High-order Singularities in Gravitational Lensing (2006)
Li, Guo-Liang, Mao, S., Jing, Y. P., Kang, X., Bartelmann, M.
We propose a new smoothing method for obtaining surface densities from discrete particle positions from numerical simulations. This is an essential step for many applications in gravitational...
A simulation pipeline for the Planck mission (2006)
Reinecke, M., Dolag, K., Hell, R., Bartelmann, M., Enßlin, T. A.
A fast method for computing strong-lensing cross sections: application to merging clusters (2006)
Fedeli, C., Meneghetti, M., Bartelmann, M., Dolag, K., Moscardini, L.
Radio emission of galaxy clusters (2006)
Golombek, I., Bartelmann, M., Enßlin, T., Jubelgas, M., Pfrommer, C., Springel, V.
Combining weak and strong lensing in cluster potential reconstruction (2006)
Cacciato, M., Bartelmann, M., Meneghetti, M., Moscardini, L.
We propose a method for recovering the two-dimensional gravitational potential of galaxy clusters which combines data from weak and strong gravitational lensing. A first estimate of the potential...
Combining weak and strong lensing in cluster potential reconstruction (2005)
Cacciato, M., Bartelmann, M., Meneghetti, M., Moscardini, L.
We propose a method for recovering the two-dimensional gravitational potential of galaxy clusters which combines data from weak and strong gravitational lensing. A first estimate of the potential...
Meneghetti, M., Bartelmann, M., Jenkins, A., Frenk, C.
We address the question of how well the density profile of galaxy clusters can be determined by combining strong lensing and velocity dispersion data. We use cosmological dark matter simulations of...
A fast method for computing strong-lensing cross sections: Application to merging clusters (2005)
Fedeli, C., Meneghetti, M., Bartelmann, M., Dolag, K., Moscardini, L.
Strong gravitational lensing by irregular mass distributions, such as galaxy clusters, is generally not well quantified by cross sections of analytic mass models. Computationally expensive...
Is the Number of Giant Arcs in LCDM Consistent With Observations? (2005)
Li, G. L., Mao, S., Jing, Y. P., Bartelmann, M., Kang, X., Meneghetti, M.
We use high-resolution N-body simulations to study the galaxy-cluster cross-sections and the abundance of giant arcs in the $\Lambda$CDM model. Clusters are selected from the simulations using the...
Strong lensing efficiency of galaxy clusters in dark energy cosmologies (2005)
Meneghetti, M., Bartelmann, M., Dolag, K., Moscardini, L., Perrotta, F., Baccigalupi, C., ...
An optimal filter for the detection of galaxy clusters through weak lensing (2005)
Maturi, M., Meneghetti, M., Bartelmann, M., Dolag, K., Moscardini, L.
An optimal filter for the detection of galaxy clusters through weak lensing (2004)
Maturi, M., Meneghetti, M., Bartelmann, M., Dolag, K., Moscardini, L.
We construct a linear filter optimised for detecting dark-matter halos in weak-lensing data. The filter assumes a mean radial profile of the halo shear pattern and modifies that shape by the noise...
Gravitational lensing of the CMB by galaxy clusters (2004)
Maturi, M., Bartelmann, M., Meneghetti, M., Moscardini, L.
We adapt a non-linear filter proposed by Hu 2001 for detecting lensing of the CMB by large-scale structures to recover surface-density profiles of galaxy clusters from their localised, weak...
Evolution of dark-matter haloes in a variety of dark-energy cosmologies (2004)
Bartelmann, M., Dolag, K., Perrotta, F., Baccigalupi, C., Moscardini, L., Meneghetti, M., ...
High-resolution, numerical simulations of 17 cluster-sized dark-matter haloes in eight different cosmologies with and without dynamical dark energy confirm the picture that core halo densities are...
Numerical study of halo concentrations in dark-energy cosmologies (2004)
Dolag, K., Bartelmann, M., Perrotta, F., Baccigalupi, C., Moscardini, L., Meneghetti, M., ...
A Catalog of Compact Groups of Galaxies in the SDSS Commissioning Data (2003)
Lee, B. C., Allam, S. S., Tucker, D. L., Annis, J., Blanton, M. R., Johnston, D. E., ...
Compact groups (CGs) of galaxies -- relatively poor groups of galaxies in which the typical separations between members is of the order of a galaxy diameter -- offer an exceptional laboratory for the...
Halo concentrations and weak-lensing number counts in dark energy cosmologies (2003)
Bartelmann, M., Perrotta, F., Baccigalupi, C.
Erratum - first version: Vol. 396 (2002) 21-30
Predictions for statistical properties of forming spheroidal galaxies (2003)
Perrotta, F., Magliocchetti, M., Baccigalupi, C., Bartelmann, M., De Zotti, G., Granato, G. L., ...
We show that the features of the recent astrophysically motivated model by Granato et al. are fully consistent with the available statistical measurements of galaxies at (sub)millimetre wavelengths....
Arc statistics in cosmological models with dark energy (2003)
Bartelmann, M., Meneghetti, M., Perrotta, F., Moscardini, L.
Halo concentrations and weak-lensing number counts in dark energy cosmologies (2002)
Bartelmann, M., Perrotta, F., Baccigalupi, C.
We study the effects of a dark energy component with equation of state p = wrho with constant w greater than or equal to -1 on the formation of Cold Dark Matter (CDM) haloes. We find two main...
Cluster detection from surface-brightness fluctuations in SDSS data (2002)
Bartelmann, M., White, S. D. M.
Galaxy clusters can be detected as surface brightness enhancements in smoothed optical surveys. This method does not require individual galaxies to be identifiable, and enables clusters to be...
Evolution and structure of magnetic fields in simulated galaxy clusters (2002)
Dolag, K., Bartelmann, M., Lesch, H.
We use cosmological magneto-hydrodynamic simulations to study the evolution of magnetic fields in galaxy clusters in two different cosmological models, a standard-CDM and a Lambda-CDM model. We show...
Cosmological information from quasar-galaxy correlations induced by weak lensing (2002)
The magnification bias of large-scale structures, combined with galaxy biasing, leads to a cross-correlation of distant quasars with foreground galaxies on angular scales of the order of arcminutes...
Predicting the clustering properties of galaxy clusters detectable by the Planck satellite (2002)
Moscardini, L., Bartelmann, M., Matarrese, S., Andreani, P.
We study the clustering properties of the galaxy clusters detectable by the Planck satellite owing to their thermal Sunyaev-Zel'dovich (SZ) effect. We take the past light-cone effect and the redshift...
Gravitational lensing of extended high-redshift sources by dark matter haloes (2002)
Perrotta, F., Baccigalupi, C., Bartelmann, M., De Zotti, G., Granato, G. L.
High-redshift galaxies and quasi-stellar objects (QSOs) are most likely to be strongly lensed by intervening haloes between the source and the observer. In addition, a large fraction of lensed...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, C., Lupton, R. H., Bernardi, M., Blanton, M. R., Burles, S., Castander, F. J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Lensing by Lyman-limit systems: Determining the mass-to-gas ratio (2002)
Maller, A. H., Kolatt, T. S., Bartelmann, M., Blumenthal, G. R.
We present a new method for determining the total mass-to- neutral gas ratio Y (H) (I) in Lyman-limit absorption systems. The method exploits the relation between the neutral hydrogen column density...
Clustering properties and gravitational lensing of forming spheroidal galaxies (2001)
Perrotta, F., Magliocchetti, M., Baccigalupi, C., Bartelmann, M., De Zotti, G., Granato, G. L., ...
We show that the predictions of the recent physical model by Granato et al. (2001) are fully consistent with the available estimates of the clustering properties of galaxies at (sub)-mm wavelengths....
The temperature-mass relation in magnetized galaxy clusters (2001)
Dolag, K, Evrard, AE, Bartelmann, M
We use cosmological, magneto-hydrodynamic simulations of galaxy clusters to quantify the dynamical importance of magnetic fields in these clusters. The set-up of initial magnetic field strengths at...
Reanalysis of the association of high-redshift 1-Jansky quasars with IRAS galaxies (1998)
A. Bartsch, P. Schneider, M. Bartelmann
We develop a new statistical method to reanalyse angular correlations between background QSOs and foreground galaxies that are supposed to be a consequence of dark matter inhomogeneities acting as...
Proper Motions Of VLBI Lenses, Inertial Frames and The Evolution of Peculiar Velocities (1996)
Kochanek, C. S, Kolatt, T. S., Bartelmann, M.
Precise determinations of the image positions in quad gravitational lenses using VLBI can be used to measure the transverse velocity of the lens galaxy and the observer. The typical proper motions...
Arc Statistics with Realistic Cluster Potentials. I. Method and First Results (1993)
{}From the lensing properties of a numerically simulated cluster, from the statistical properties of the giant arcs produced by the cluster, and from comparing the cluster properties derived both...
Large-scale correlations between QSOs and IRAS galaxies (1993)
We demonstrate that high-redshift 1-Jansky radio sources are correlated with foreground IRAS galaxies on angular scales of several 10 arc minutes on a statistical significance level of up to 99.8\%....
A gravitational lens model for B1422+231 (1993)
Kormann, R., Schneider, P., Bartelmann, M.
We construct a simple elliptical gravitational lens model for the quadruple lens B1422+231 and show that the details of the configuration cannot be easily understood in terms of this model; in...
Timescales of isotropic and anisotropic cluster collapse (1993)
Bartelmann, M., Ehlers, Jürgen, Schneider, P.
From a simple estimate for the formation time of galaxy clusters, Richstone et al. have recently concluded that the evidence for non-virialized structures in a large fraction of observed clusters...
Reuter, S, Bartelmann, M, Vogt, M, Geisen, C, Napierski, I, Kahn, T, ...
Integration of human papillomavirus (HPV) DNA into the host cell genome is an important step in cervical carcinogenesis. In tumour cells with integrated HPV DNA, transcription of viral oncogenes E6...
Reuter, S, Bartelmann, M, Vogt, M, Geisen, C, Napierski, I, Kahn, T, ...
Integration of human papillomavirus (HPV) DNA into the host cell genome is an important step in cervical carcinogenesis. In tumour cells with integrated HPV DNA, transcription of viral oncogenes E6...