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Iron-line and continuum variations in the XMM-Newton and Suzaku spectra of the neutron-star low-mass X-ray binary 4U 1636-53
Homan, Jeroen; Hiemstra, Beike; Belloni, Tomaso +3 more
We used six simultaneous XMM-Newton and Rossi X-ray Timing Explorer plus five Suzaku observations to study the continuum spectrum and the iron emission line in the neutron-star low-mass X-ray binary 4U 1636-53. We modelled the spectra with two thermal components (representing the accretion disc and boundary layer), a Comptonized component (represe…
Confronting the concordance model of cosmology with Planck data
Hazra, Dhiraj Kumar; Shafieloo, Arman
We confront the concordance (standard) model of cosmology, the spatially flat ΛCDM Universe with power-law form of the primordial spectrum with Planck CMB angular power spectrum data searching for possible smooth deviations beyond the flexibility of the standard model. The departure from the concordance cosmology is modeled in the context of Cross…
Discovery of periodic dips in the light curve of GX 13+1: the X-ray orbital ephemeris of the source
Robba, N. R.; Di Salvo, T.; Burderi, L. +3 more
Context. The bright low-mass X-ray binary (LMXB) GX 13+1 is one of the most peculiar Galactic binary systems. A periodicity of 24.27 d was observed in its power spectrum density obtained from data collected over 14 years by the All Sky Monitor (ASM) on board the Rossi X-ray Timing Explorer (RXTE).
Aims: To determine the first X-ray orbital ep…
A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy
Auvergne, M.; Fossati, L.; Poretti, E. +28 more
The existence of pulsations in HgMn stars is still being debated. To provide the first unambiguous observational detection of pulsations in this class of chemically peculiar objects, the bright star
Dark matter-baryons separation at the lowest mass scale: the Bullet Group{star}.
Rossetti, M.; Gastaldello, F.; Ghizzardi, S. +13 more
We report on the X-ray observation of a strong lensing selected group, SL2S J08544-0121, with a total mass of 2.4 ± 0.6 × 1014 M⊙ which revealed a separation of 124 ± 20 kpc between the X-ray emitting collisional gas and the collisionless galaxies and dark matter (DM), traced by strong lensing. This source allows to put an or…
Constraints on the cosmological parameters from BICEP2, Planck, and WMAP
Cheng, Cheng; Huang, Qing-Guo
In this paper we constrain the cosmological parameters, in particular the tilt of tensor power spectrum, by adopting Background Imaging of Cosmic Extragalactic Polarization (B2), Planck released in 2013 and Wilkinson Microwaves Anisotropy Probe 9-year Polarization data. We find that a blue tilted tensor power spectrum is preferred at more than
Solar X-ray Monitor (XSM) on-board Chandrayaan-2 orbiter
Shanmugam, M.; Vadawale, S. V.; Acharya, Y. B. +6 more
The remote X-ray fluorescence spectroscopy is a powerful technique to investigate the elemental abundances in the atmosphere-less planetary bodies. The experiment involves measuring spectra of fluorescent X-rays from lunar surface using a low energy X-ray detector onboard an orbiting satellite. Since the flux of fluorescent X-ray lines critically …
Cutoff in the hard X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1
Sazonov, S. Yu.; Lutovinov, A. A.; Krivonos, R. A.
Using data from the XMM-Newton and INTEGRAL observatories, we have detected a cutoff at energies above 10 keV in the X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1. The spectra obtained can be described by amodel of Comptonization of radiation in a gas cloud of moderate temperature ( kT ∼ 2-3 keV) and high optical depth ( τ …
Thermophysical property variations across Dione and Rhea
Spencer, J. R.; Howett, C. J. A.; Segura, M. +2 more
Maps of the variation in bolometric Bond albedo and thermal inertia across Rhea and Dione have been produced using various day and nighttime observations, taken by Cassini's Composite Infrared Spectrometer (CIRS). The albedo maps show the same trend that has been previously observed on these satellites from reflected sunlight and thermal observati…
Equilibrium composition between liquid and clathrate reservoirs on Titan
Sotin, Christophe; Mousis, Olivier; Choukroun, Mathieu +1 more
Hundreds of lakes and a few seas of liquid hydrocarbons have been observed by the Cassini spacecraft to cover the polar regions of Titan. A significant fraction of these lakes or seas could possibly be interconnected with subsurface liquid reservoirs of alkanes. In this paper, we investigate the interplay that would happen between a reservoir of l…