Search Publications
Interstellar Pickup Ion Production in the Global Heliosphere and Heliosheath
Wu, Y.; Guo, X.; Florinski, V.
Interstellar pickup ions (PUIs) play a significant part in mediating the solar wind (SW) interaction with the interstellar medium. In this paper, we examine the details of spatial variation of the PUI velocity distribution function (VDF) in the SW by solving the PUI transport equation. We assume the PUI distribution is isotropic resulting from str…
Temporal Evolution of Solar Energetic Particle Spectra
Dalla, Silvia; Doran, Donald J.
During solar flares and coronal mass ejections, Solar Energetic Particles (SEPs) may be released into the interplanetary medium and near-Earth locations. The energy spectra of SEP events at 1 AU are typically averaged over the entire event or studied in a few snapshots. In this article we analyze the time evolution of the energy spectra of four la…
Unveiing the X‑ray/UV properties of disk winds in active galactic nuclei using broad and mini‑broad absorption line quasars
Giustini, M.
We present the results of the uniform analysis of 46 XMM-Newton observations of six BAL and seven mini-BAL QSOs belonging to the Palomar-Green Quasar catalogue. Moderate-quality X-ray spectroscopy was performed with the EPIC-pn, and allowed to characterise the general source spectral shape to be complex, significantly deviating from a power law em…
Discovery of hard phase lags in the pulsed emission of GRO J1744-28
Sanna, A.; Di Salvo, T.; Burderi, L. +4 more
We report on the discovery and energy dependence of hard phase lags in the 2.14 Hz pulsed profiles of GRO J1744-28. We used data from XMM-Newton and NuSTAR. We were able to well constrain the lag spectrum with respect to the softest (0.3-2.3 keV) band: the delay shows increasing lag values reaching a maximum delay of ∼12 ms, between 6 and 6.4 keV.…
Observations of the surface of Titan by the Radar Altimeters on the Huygens Probe
Lorenz, R. D.; Plettemeier, D.; Witasse, O. +8 more
Results from the radar altimeters on board the Huygens probe are reported, noting the content of data archived on the NASA Planetary Data System and its ESA counterpart. These instruments provide unique high-resolution information on the topography and electrical properties of the Titan surface over a ∼15 km track across a boundary between a brigh…
Trapping of Noble Gases by Radiative Association with H3 + in the Protosolar Nebula
Mousis, O.; Pauzat, F.; Bacchus-Montabonel, M. -C. +1 more
The heavy noble gas deficiencies observed in Titan’s atmosphere and in comets have been proposed to be related to a sequestration process by {{{H}}}3+ in the gas phase at the early protosolar nebula. Chemical thermodynamics and astrophysics modeling are favorable to this hypothesis, as presented in preceding papers. However, …
On the Chemistry of Hydrides of N Atoms and O+ Ions
Viti, Serena; Williams, David A.; Awad, Zainab
Previous work by various authors has suggested that the detection by Herschel/HIFI of nitrogen hydrides along the low-density lines of sight toward G10.6-0.4 (W31C) cannot be accounted for by gas-phase chemical models. In this paper we investigate the role of surface reactions on dust grains in diffuse regions, and we find that formation of the hy…
Cluster observation of magnetohydrodynamic turbulence in the plasma sheet boundary layer
Narita, Y.
Measurement of turbulent magnetic field is presented from the Earth magnetotail crossing of the Cluster spacecraft on August 25, 2006, as an ideal case study of magnetohydrodynamic turbulence in the plasma sheet boundary layer on a spatial scale of about 10,000 km. The fluctuation energy of the magnetic field is evaluated in both the frequency and…
Measurements of the Soft Gamma-Ray Emission from SN2014J with Suzaku
Fukazawa, Y.; Takahashi, T.; Diehl, R. +9 more
The hard X-ray detector (HXD) on board Suzaku measured soft γ-rays from the SN Ia SN2014J at 77 ± 2 days after the explosion. Although the confidence level of the signal is about 90% (I.e., 2σ), the 3σ upper limit has been derived at <2.2 × 10-4 ph s-1 cm-2 in the 170-250 keV band as the first independent measur…
X-Ray Spectral and Temporal Analysis of Narrow Line Seyfert 1 Galaxy Was 61
Yuan, Weimin; Zhou, Hongyan; Wang, Ting-Gui +3 more
We present an analysis of spectrum and variability of the bright reddened narrow line Seyfert 1 galaxy Was 61 using 90 ks archival XMM-Newton data. The X-ray spectrum in 0.2-10 keV can be characterized by an absorbed power-law plus soft excess and an Fe Kα emission line. The power-law spectral index remains constant during the flux variation. The …