Search Publications
Scaling relations with a complete sample of galaxy groups
Lovisari, L.; Reiprich, T. H.
Galaxy clusters are an attractive tool to constrain cosmological parameters and well-determined scaling relations between X-ray observables and cluster mass give us a precious diagnostic to study the thermodynamical history of the intra-cluster medium (ICM). We are in the process of improving the accuracy of scaling relations using a complete samp…
The spectroscopic orbit of the K-giant binary γ Canis Minoris
Strassmeier, K. G.; Weber, M.; Pourbaix, D. +2 more
We have determined an improved orbit for the bright, evolved, double lined binary γ Canis Minoris. The system has an orbital period of 389.31 days and an eccentricity of 0.2586. We have revised the secondary to primary mass ratio to 0.987. The spectral types of the primary and secondary are K4 III and K1: III, respectively, and the components have…
The ``Sausage'' and ``Toothbrush'' clusters of galaxies and the prospects of LOFAR observations of clusters of galaxies
Brunetti, G.; Tasse, C.; Cassano, R. +27 more
LOFAR, the Low Frequency Radio Array, is a new pan-European radio telescope that is almost fully operational. One of its main drivers is to make deep images of the low frequency radio sky. To be able to do this a number of challenges need to be addressed. These include the high data rates, removal of radio frequency interference, calibration of th…
Radio observations of Planck clusters
Kale, R.
Recently, a number of new galaxy clusters have been detected by the ESA-Planck satellite, the South Pole Telescope, and the Atacama Cosmology Telescope using the Sunyaev-Zel'dovich effect. Several of the newly detected clusters are massive, merging systems with disturbed morphology in the X-ray surface brightness. Diffuse radio sources in clusters…
Determining distances using asteroseismic methods
Serenelli, A. M.; Chaplin, W. J.; Miglio, A. +5 more
Asteroseismology has been extremely successful in determining the properties of stars in different evolutionary stages with a remarkable level of precision. However, to fully exploit its potential, robust methods for estimating stellar parameters are required and independent verification of the results is needed. In this talk, I present a new tech…
Angular distribution of discontinuity normals of the interplanetary magnetic field
Erdős, G.; Lukács, K.
High time resolved (6 s) magnetic field data from the Helios-1 and Ulysses spacecrafts were used to investigate MHD discontinuities in the heliosphere. The identification of discontinuities was based on the rotation of the field vectors relative to the distance to the plasma in which the vectors were supposed to be frozen. In order to obtain the r…
Distant clusters of galaxies in a deep XMM-Newton observation
Böhringer, H.; Rosati, P.; Schwope, A. +10 more
The XMM-Newton Distant Cluster Project (XDCP) aims at the identification of a well defined sample of X-ray selected clusters of galaxies at redshifts z ≥ 0.8. As part of this project, we analyse the deep archival XMM-Newton exposure of LBQS 2212-1759 to quantify the cluster content. We validate the optical follow-up strategy as well as the X-ray s…
Comparison of the four catalogues by pairs, the Hipparcos, new Hipparcos, EOC-2 and IL, by using µδ for the common 1120 stars}
Cvetković, Z.; Damljanović, G.; Cvetković , Z.
We present comparison results of our Independent Latitude (IL) catalogue of µδ determinations for 1120 bright stars with the Hipparcos, new Hipparcos and Earth Orientation Catalogue (EOC-2) values. Also, we took into consideration the EOC3 and EOC4 (recent versions of EOC catalogues). Our µδ values are based on ze…
Clusters of galaxies in the Planck survey
Pointecouteau, E.
The Planck satellite has surveyed the whole sky more than four times. The nominal mission of two all-sky surveys will be released to the public in 2013. From the first all-sky survey, we have demonstrated the ability to detect clusters via the Sunyaev-Zel'dovich effect with high reliability and out to large redshifts. We have released the first la…
Detection and characterisation of the first Planck high-z candidates
Flores-Cacho, I.
With its unprecedented ability to scrutinise the sub-millimetre (sub-mm) to centimetre full sky, the Planck satellite is uniquely suited to search for the progenitors of clusters of galaxies. The forming massive halos at z ≳1-2 are expected to host massive galaxies with high star formation rates. Clustered in the growing potential well that is bei…