Search Publications
The XMM-Newton survey of the Small Magellanic Cloud: a new X-ray view of the symbiotic binary SMC 3
Pietsch, W.; Haberl, F.; Greiner, J. +7 more
Context. The XMM-Newton survey of the Small Magellanic Cloud (SMC) was performed to study the population of X-ray sources in this neighbouring galaxy. During one of the observations, the symbiotic binary SMC 3 was found at its highest X-ray luminosity as observed until now.
Aims: In SMC 3 wind accretion from a giant donor star onto a white dw…
Morphology of the Red Rectangle Proto-planetary Nebula
Kwok, Sun; Steffen, W.; Koning, N.
The morphology of the Red Rectangle (RR) exhibits several singular attributes. Most prominent are a series of linear features perpendicular to the symmetry axis which appear as "ladder rungs" across the nebula. At the edge of each "rung" gas seemingly flows from bright knots in a parabolic shape toward the center of the nebula. We present a new mo…
Is it possible to model observed active region coronal emission simultaneously in EUV and X-ray filters?
Karlický, M.; Dzifčáková, E.; Dudík, J. +1 more
Aims: We investigate the possibility of modeling the active region coronal emission in the EUV and X-ray filters using one, universal, steady heating function, tied to the properties of the magnetic field.
Methods: We employ a simple, static model to compute the temperature and density distributions in the active region corona. The model…
Exploring the galaxy cluster-group transition regime at high redshifts. Physical properties of two newly detected z > 1 systems
Böhringer, H.; Pratt, G. W.; Rosati, P. +11 more
Context. Multi-wavelength surveys for clusters of galaxies are opening a window on the elusive high-redshift (z > 1) cluster population. Well controlled statistical samples of distant clusters will enable us to answer questions about their cosmological context, early assembly phases and the thermodynamical evolution of the intracluster medium. …
Properties of Dust and PAHs in the Hot Plasma of the Elliptical Galaxy NGC 4125 Revealed with AKARI and Spitzer Space Telescope
Oyabu, Shinki; Onaka, Takashi; Yamagishi, Mitsuyoshi +4 more
We present the spatial distributions of dust and polycyclic aromatic hydrocarbons (PAHs) in the elliptical galaxy NGC 4125, revealed by AKARI and Spitzer. NGC 4125 is relatively bright in dust and PAH emision for elliptical galaxies, although it certainly possesses diffuse interstellar hot plasma, indicated by the high spatial resolution X-ray dat…
A new grid of synthetic spectra for the analysis of [WC]-type central stars of planetary nebulae
Bianchi, Luciana; Bohlin, Ralph C.; Herald, James E. +2 more
We present a comprehensive grid of synthetic stellar-atmosphere spectra, suitable for the analysis of high-resolution spectra of hydrogen-deficient post-asymptotic giant branch objects hotter than 50 000 K, migrating along the constant luminosity branch of the Hertzsprung-Russell diagram. The grid was calculated with CMFGEN, a state-of-the-art ste…
High-resolution mapping of the physical conditions in two nearby active galaxies based on 12CO(1-0), (2-1), and (3-2) lines
Krips, M.; Schinnerer, E.; Baker, A. J. +7 more
We present a detailed analysis of high resolution observations of the three lowest CO transitions in two nearby active galaxies, NGC 4569 and NGC 4826. The CO(1-0) and (2-1) lines were observed with the Plateau de Bure Interferometer and the CO(3-2) line with the Submillimeter Array. Combining these data allows us to compare the emission in the th…
Suzaku Diagnostics of the Energetics in the Lobes of the Giant Radio Galaxy 3C 35
Isobe, Naoki; Gandhi, Poshak; Tashiro, Makoto S. +1 more
The Suzaku observation of a giant radio galaxy 3C 35 revealed faint extended X-ray emission, associated with its radio lobes and/or host galaxy. After careful subtraction of the X-ray and non-X-ray background and contaminating X-ray sources, the X-ray spectrum of the faint emission was reproduced by a sum of the power-law (PL) and soft thermal com…
Global p-mode oscillations throughout the complete solar cycle 23 and the beginning of cycle 24
García, R. A.; Pallé, P. L.; Jiménez, A. +1 more
The parameters of the p-mode oscillations vary with solar activity. Such temporal variations provide insights for the study of the structural and dynamical changes occurring in the Sun's interior throughout the solar cycle. We present here a complete picture of the temporal variations of the global p-mode parameters (excitation, damping, frequency…
Fast horizontal flows in a quiet sun MHD simulation and their spectroscopic signatures
Fischer, C. E.; Keller, C. U.; Vögler, A. +1 more
Numerical simulations of solar surface convection have predicted the existence of supersonic horizontal flows in the photospheric granulation. Recently, the detection of such flows in data from the Hinode satellite was reported. We study supersonic granular flows in detail to understand their signatures in spectral lines and to test the observatio…