Search Publications

Attempt to detect the granulation signature in the HgMn star HD 175640 from CoRoT light curves

Alecian, G.; Ghazaryan, S.; Harutyunian, H.

HgMn stars are affected by atomic diffusion processes. Because theoretical models based on atomic diffusion require that the atmospheres of ApBp stars have to be much more stable than those of normal stars, the detection or the absence of detection of granulation in them should be an interesting information for the modelling. We would like to addr…

Confirmation of the nature of the absorber in IRAS 09104+4109

Fabian, A. C.; Gandhi, P.; Cackett, E. M. +1 more

We present the first long Suzaku observation of the hyperluminous infrared galaxy IRAS 09104+4109 which is dominated by a Type 2 AGN. The infrared to X-ray spectral energy distribution (SED) indicates that the source is an obscured quasar with a Compton-thin absorber. However, the 3σ hard X-ray detection of the source with the BeppoSAX PDS suggest…

Rotational non-LTE in HCN in the thermosphere of Titan: Implications for the radiative cooling

Hartogh, P.; Rezac, L.; Kutepov, A. A. +2 more

Context. The thermal structure of Titan's thermosphere is determined by the balance between several heating and cooling processes. These processes must be accurately modeled to correctly interpret the available measurements and enhance our understanding of the formation and evolution of this atmosphere. One of the most important thermospheric cool…

A BeppoSAX and XMM-Newton spectral study of 4U 1735-44

Santangelo, A.; Mück, B.; Piraino, S.

Context. Low-mass X-ray binary systems consist of a neutron star and a main-sequence companion star. The compact object accretes matter via Roche-lobe overflow, which leads to an accretion disk. In addition to a broad-band continuum emission of a thermal component and a Comptonization part, evidence for a broad iron K_α line is found in …

The Hot--blackbody Spectral Excess in Low--luminosity High--Mass X--Ray Binaries

Tiengo, A.; Mereghetti, S.; Sidoli, L. +2 more

We report on the main results obtained thanks to an observation campaign with XMM-Newton of four persistent, low-luminosity (L_{X} ∼ 10^{34} erg s^{-1}) and long-period (P > 200 s) Be accreting pulsars. We found that all sources considered here are characterized by a spectral excess that can be described with a blackbody component of high tempe…

Orbifold line topology and the cosmic microwave background

Rathaus, Ben; Ben-David, Assaf; Itzhaki, Nissan

We extend our study of a universe with a non-classical stringy topology, and consider an orbifold line topology, Bbb R × Bbb R²/Bbb Z_p. This topology has a fixed line and identifies each point in space with p-1 other points. An observable imprint of an orbifold line on the CMB is the appearance of up to (p-1)/2 pairs of match…

Dusty Universe viewed by AKARI far infrared detector

Buat, V.; Małek, K.; Burgarella, D. +5 more

We present the results of the analysis of multiwavelength Spectral Energy Distributions (SEDs) of far-infrared galaxies detected in the AKARI Deep Field-South (ADF-S) Survey. The analysis uses a carefully selected sample of 186 sources detected at the 90 µm AKARI band, identified as galaxies with cross-identification in public catalogues. Fo…

Clustering of far-infrared galaxies in the AKARI All-Sky Survey North

Oyabu, S.; Takeuchi, T. T.; Pollo, A. +4 more

We present the measurements of the angular two-point correlation function for AKARI 90-µm point sources, detected outside the Milky Way plane and other regions characterized by high Galactic extinction in the northern Galactic hemisphere, and categorized as extragalactic sources according to our far-infrared-color based criterion. Together w…

Cluster observations of large-scale southward movement and dawnward-duskward flapping of Earth's magnetotail current sheet

Cao, J. B.; Ma, Y. D.; Wei, X. H. +1 more

Simultaneous Analysis of Recurrent Jovian Electron Increases and Galactic Cosmic Ray Decreases

Fichtner, H.; Scherer, K.; Gómez-Herrero, R. +10 more

The transport environment for particles in the heliosphere, e.g. galactic cosmic rays (GCRs) and MeV electrons (including those originating from Jupiters magnetosphere), is defined by the solar wind flow and the structure of the embedded heliospheric magnetic field. Solar wind structures, such as co-rotating interaction regions (CIR), can result i…