Search Publications
The 2008 outburst of IGR J17473-2721: evidence for a disk corona?
Torres, D. F.; Zhang, S.; Kretschmar, P. +4 more
Context. The 2008 outburst of the atoll source IGR J17473-2721 was observed by INTEGRAL, RXTE and Swift. Tens of type-I X-ray bursts were found in this outburst.
Aims: Joint observations by INTEGRAL, RXTE, and Swift provide sufficient data to look into the behavior of IGR J17473-2721 at the rising part of the 2008 outburst. The relation betwe…
The new carbon symbiotic star IPHAS J205836.43+503307.2
Munari, U.; Corradi, R. L. M.; Angeloni, R. +5 more
Aims: We are performing a search for symbiotic stars using IPHAS, the INT Hα survey of the northern Galactic plane, and follow-up observations.
Methods: Candidate symbiotic stars are selected on the basis of their IPHAS and near-IR colours, and spectroscopy and photometry are obtained to determine their nature. We present here observatio…
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…
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. …
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…
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…
Hinode SOT/SP and SoHO/MDI quiet Sun magnetic field. Implications of their differences on the extrapolated chromospheric field and the height of the magnetic canopy
Tziotziou, K.; Tsiropoula, G.; Kontogiannis, I.
Aims: We explore the differences in the measurement of the magnetic field of the quiet solar photosphere provided by the Michelson Doppler Imager (MDI) onboard SoHO and the SpectroPolarimeter (SOT/SP) onboard Hinode and the ensuing implications for the extrapolated chromospheric magnetic field and the determination of the location of the magn…
A comprehensive approach to analyzing the XMM-Newton data of Seyfert 1 galaxies
Santos-Lleó, M.; Krongold, Y.; Rodríguez-Pascual, P. +3 more
Aims: We seek a comprehensive analysis of all the information provided by the XMM-Newton satellite of the four Seyfert 1 galaxies ESO 359-G19, HE 1143-1810, CTS A08.12, and Mrk 110, including the UV range, to characterize the different components that are emitting and absorbing radiation in the vicinity of the active nucleus.
Methods: Th…
Resolving the L/T transition binary SDSS J2052-1609 AB
Bouy, H.; Henning, Th.; Brandner, W. +3 more
Context. Binaries provide empirically derived key constraints for star formation theories, including the overall binary fraction, mass ratio distribution, and the separation distribution. They play crucial roles in calibrating the output of theoretical models, such as absolute magnitudes, colors, and effective temperature depending on mass, metall…