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Accreting magnetars: a new type of high-mass X-ray binaries?
Reig, P.; Torrejón, J. M.; Blay, P.
The discovery of very slow pulsations (Pspin =5560 s) has solved the long-standing question of the nature of the compact object in the high-mass X-ray binary 4U 2206+54 but has posed new ones. According to spin evolutionary models in close binary systems, such slow pulsations require a neutron star magnetic field strength larger than th…
Mars exospheric thermal and non-thermal components: Seasonal and local variations
Leblanc, F.; Modolo, R.; Hess, S. +3 more
A model of the martian exosphere is built for average solar conditions. A Chamberlain’s approach (Chamberlain, J.W. [1963]. Planet. Space Sci. 11, 901) is used to describe the O, CO, CO2, and O2 thermal exospheric components. The average thermal oxygen density at 300 km in altitude varies by about one order of magnitude with …
The AKARI NEP-Deep survey: a mid-infrared source catalogue
Im, M.; Lee, H. M.; White, G. J. +13 more
We present a new catalogue of mid-IR sources using the AKARI NEP-Deep survey. The InfraRed Camera (IRC) onboard AKARI has a comprehensive mid-IR wavelength coverage with 9 photometric bands at 2-24 µm. We utilized all of these bands to cover a nearly circular area adjacent to the north ecliptic pole (NEP). We designed the catalogue to includ…
The Absence of Ex-companions in Type Ia Supernova Remnants
Kilic, Mukremin; Di Stefano, R.
Type Ia supernovae (SNe Ia) play important roles in our study of the expansion and acceleration of the universe, but because we do not know the exact nature or natures of the progenitors, there is a systematic uncertainty that must be resolved if SNe Ia are to become more precise cosmic probes. No progenitor system has ever been identified either …
Physical properties of trans-neptunian binaries (120347) Salacia-Actaea and (42355) Typhon-Echidna
Buie, M. W.; Rieke, G. H.; Roe, H. G. +7 more
We report new Hubble Space Telescope and Spitzer Space Telescope results concerning the physical properties of the trans-neptunian object (TNO) binaries (120347) Salacia-Actaea (formerly 2004 SB60), and (42355) Typhon-Echidna (formerly 2002 CR46). The mass of the (120347) Salacia-Actaea system is 4.66 ± 0.22 × 1020…
Clustering of submillimetre galaxies in a self-regulated baryon collapse model
Danese, L.; Negrello, M.; Lapi, A. +3 more
We investigate anisotropies in the cosmic infrared background (CIB) using a combination of the physical evolutionary model for proto-spheroid galaxies of Granato et al. and an independent halo occupation distribution analysis. After having re-calibrated the cumulative flux function dS/dz at ?m using the available determinations of the shot-noise a…
NGC 454: unveiling a new 'changing look' active galactic nucleus
Braito, V.; Caccianiga, A.; Severgnini, P. +2 more
We present a detailed analysis of the X-ray spectrum of the Seyfert 2 galaxy NGC 454E, belonging to the interacting system NGC 454. Observations performed with Suzaku, XMM-Newton and Swift allowed us to detect a dramatic change in the curvature of the 2-10 keV spectrum, revealing a significant variation of the absorbing column density along the li…
Simultaneous X-ray and optical observations of true type 2 Seyfert galaxies
Wolter, Anna; Bianchi, Stefano; La Franca, Fabio +9 more
We present the results of a campaign of simultaneous X-ray and optical observations of 'true' type 2 Seyfert galaxies candidates, i.e. active galactic nuclei without a broad-line region (BLR). Out of the initial sample composed of eight sources, one object, IC 1631, was found to be a misclassified starburst galaxy, another, Q2130-431, does show br…
The SOPHIE search for northern extrasolar planets. IV. Massive companions in the planet-brown dwarf boundary
Bouchy, F.; Moutou, C.; Queloz, D. +20 more
Context. The mass domain where massive extrasolar planets and brown dwarfs lie is still poorly understood. Indeed, not even a clear dividing line between massive planets and brown dwarfs has been established yet. This is partly because these objects are very scarce in close orbits around solar-type stars, the so-called brown dwarf desert. Owing to…
Orbital Decay and Evidence of Disk Formation in the X-Ray Binary Pulsar OAO 1657-415
Wilson-Hodge, C. A.; Camero-Arranz, A.; Finger, M. H. +1 more
OAO 1657-415 is an eclipsing X-ray binary wind-fed pulsar that has exhibited smooth spin-up/spin-down episodes and has undergone several torque reversals throughout its long history of observation. We present a frequency history spanning nearly 19 years of observations from the Burst and Transient Source Experiment and from the Gamma-Ray Burst Mon…