Search Publications
Complex diffuse emission in the z = 0.52 cluster PLCK G004.5-19.5
Mernier, F.; Brunetti, G.; Röttgering, H. J. A. +4 more
We present radio observations of the galaxy cluster PLCK G004.5-19.5 (z = 0.52) using the Giant Metrewave Radio Telescope at 150 MHz, 325 MHz, and 610 MHz. We find an unusual arrangement of diffuse radio emission in the center and periphery of the cluster, as well as several radio galaxies with head-tail emission. A patch of peripheral emission re…
Determination of robust metallicities for metal-rich red giant branch stars. An application to the globular cluster NGC 6528
Liu, C.; Primas, F.; Feltzing, S. +1 more
Context. The study of the Milky Way relies on our ability to interpret the light from stars correctly. With the advent of the astrometric ESA mission Gaia we will enter a new era where the study of the Milky Way can be undertaken on much larger scales than currently possible. In particular we will be able to obtain full 3D space motions of red gia…
The Integrated Cluster Finder for the ARCHES project
Schwope, Axel; Mints, Alexey; Rosen, Simon +2 more
Context. Clusters of galaxies are important for cosmology and astrophysics. They may be discovered through either the summed optical/IR radiation originating from their member galaxies or via X-ray emission originating from the hot intracluster medium. X-ray samples are not affected by projection effects but a redshift determination typically need…
Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus
Skopal, A.; Shagatova, N.
Context. Light curves (LCs) of some symbiotic stars show a different slope of the ascending and descending branch of their minimum profile. The origin of this asymmetry is not well understood.
Aims: We explain this effect in the ultraviolet LCs of the symbiotic binary SY Mus.
Methods: We model the continuum fluxes in the spectra obtained…
Candidate exoplanet host HD 131399A: a nascent Am star
Przybilla, N.; Buder, S.; Aschenbrenner, P.
Direct imaging suggests that there is a Jovian exoplanet around the primary A-star in the triple-star system HD 131399. We investigate a high-quality spectrum of the primary component HD 131399A obtained with FEROS on the ESO/MPG 2.2 m telescope, aiming to characterise the star's atmospheric and fundamental parameters, and to determine elemental a…
The amplitude of the cross-covariance function of solar oscillations as a diagnostic tool for wave attenuation and geometrical spreading
Gizon, Laurent; Birch, Aaron C.; Nagashima, Kaori +1 more
Context. In time-distance helioseismology, wave travel times are measured from the two-point cross-covariance function of solar oscillations and are used to image the solar convection zone in three dimensions. There is, however, also information in the amplitude of the cross-covariance function, for example, about seismic wave attenuation.
Ai…
Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images: The southern hemisphere (Corrigendum)
Jorda, L.; Lamy, P. L.; Lara, L. M. +49 more
The active nucleus of the ULIRG IRAS F00183-7111 viewed by NuSTAR
Vignali, C.; Gilli, R.; Piconcelli, E. +6 more
We present an X-ray study of the ultra-luminous infrared galaxy IRAS F00183-7111 (z = 0.327), using data obtained from NuSTAR, Chandra X-ray Observatory, Suzaku and XMM-Newton. The Chandra imaging shows that a point-like X-ray source is located at the nucleus of the galaxy at energies above 2 keV. However, the point source resolves into diffuse em…
Investigating the behaviour of neutral hydrogen Lyα spectral line width in polar coronal holes at solar minimum
Susino, R.; Antonucci, E.; Spadaro, D. +2 more
We investigate the behaviour of the H I Lyα spectral line widths measured by UVCS/SOHO in polar coronal holes at minimum of solar magnetic activity. The line widths are reported to significantly increase up to 3 R⊙, while above 3 R⊙ there is observational evidence of either nearly constant or slightly decreasing values. We ad…
Decay of COSAC and Ptolemy mass spectra at comet 67P/Churyumov-Gerasimenko
Krüger, Harald; McKenna-Lawlor, Susan; Gautier, Thomas +11 more
Context. The Rosetta lander Philae successfully landed on the nucleus of comet 67P/Churyumov-Gerasimenko on 12 November 2014. Philae is equipped with two gas analysers: The Cometary Sampling and Composition experiment (COSAC) and the gas chromatograph and mass spectrometer Ptolemy.
Aims: COSAC is designed for in situ analysis of organic molec…