Search Publications
Herschel-SPIRE spectroscopy of G29.96-0.02: Fitting the full SED
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A. +42 more
We use the SPIRE Fourier-transform spectrometer (FTS) on-board the ESA Herschel Space Observatory to analyse the submillimetre spectrum of the Ultra-compact HII region G29.96-0.02. Spectral lines from species including 13CO, CO, [CI], and [NII] are detected. A sparse map of the [NII] emission shows at least one other HII region neighbou…
Disentangling the gamma-ray emission of NGC 1275 and that of the Perseus cluster
Colafrancesco, S.; Giommi, P.; Marchegiani, P.
Context. The Gamma-ray emission from galaxy clusters hosting active galaxies is a complex combination of diffuse and point-like emission features with different spectral and spatial properties.
Aims: We discuss in details the case of the Perseus cluster containing the radio-galaxy NGC 1275 that has been recently detected as a bright gamma-ray…
Spectral evolution of bright NS LMXBs with INTEGRAL: an application of the thermal plus bulk Comptonization model
Santangelo, A.; Rodriguez, J.; Bazzano, A. +7 more
Aims: The aim of this work is to investigate in a physical and quantitative way the spectral evolution of bright neutron star low-mass X-ray binaries (NS LMXBs) with special regard to the transient hard X-ray tails.
Methods: We analyzed INTEGRAL data for five sources (GX 5-1, GX 349+2, GX 13+1, GX 3+1, GX 9+1) and built broad-band X-ray …
Wavelet and R/S analysis of the X-ray flickering of cataclysmic variables
de Martino, D.; Bianchini, A.; Anzolin, G. +1 more
Context. Recently, wavelets and R/S analysis have been used as statistical tools to characterize the optical flickering of cataclysmic variables.
Aims: Here we present the first comprehensive study of the statistical properties of X-ray flickering of cataclysmic variables in order to link them with physical parameters.
Methods: We analyz…
X-ray spectroscopy and photometry of the long-period polar AI Trianguli with XMM-Newton
Burwitz, V.; Beuermann, K.; Dreizler, S. +4 more
Context. The energy balance of cataclysmic variables with strong magnetic fields is a central subject in understanding accretion processes on magnetic white dwarfs. With XMM-Newton, we perform a spectroscopic and photometric study of soft X-ray selected polars during their high states of accretion.
Aims: On the basis of X-ray and optical obse…
The Lorentz force in atmospheres of chemically peculiar stars: 56 Arietis
Shulyak, D.; Kochukhov, O.; Galazutdinov, G. +5 more
Context. The presence of electric currents in the atmospheres of magnetic chemically peculiar (mCP) stars could theoretically constrain the nature and evolution of magnetic field in these stars. The Lorentz force, which is the result of the interaction between the magnetic field and the induced currents, modifies the atmospheric structure and indu…
Analyzing X-ray pulsar profiles: geometry and beam pattern of EXO 2030+375
Klochkov, D.; Santangelo, A.; Sasaki, M. +2 more
Context. The pulse profiles of the transient Be/X-ray binary EXO 2030+375 show strong dependence on energy, as well as on its luminosity state, and are asymmetric in shape.
Aims: We want to identify the emission components of the two magnetic poles in the pulsed emission to understand the geometry of the neutron star and its beam pattern.
XMM-Newton detection of two clusters of galaxies with strong SPT Sunyaev-Zel'dovich effect signatures
Finoguenov, A.; Böhringer, H.; Pratt, G. W. +9 more
We report on the discovery of two galaxy clusters, SPT-CL J2332-5358 and SPT-CL J2342-5411, in X-rays. These clusters were also independently detected through their Sunyaev-Zel'dovich effect by the South Pole Telescope, and in the optical band by the Southern Cosmology Survey. They are thus the first clusters detected under survey conditions by al…
Expansion of magnetic flux concentrations: a comparison of Hinode SOT data and models
Solanki, S. K.; Pietarila, A.; Cameron, R.
Context. The expansion of network magnetic fields with height is a fundamental property of flux tube models. A rapid expansion is required to form a magnetic canopy.
Aims: We characterize the observed expansion properties of magnetic network elements and compare them with the thin flux tube and sheet approximations, as well as with magnetocon…
Explaining the Praesepe blue straggler HD 73666
Fossati, L.; Weiss, W.; Mochnacki, S. +1 more
Aims: The blue straggler phenomenon is not yet well explained by current theory, although evolutionary models of star clusters require a good knowledge of it. We attempt to develop a formation scenario for HD 73666, a blue straggler member of the Praesepe cluster.
Methods: We compile the known physical properties of HD 73666 found in the…