Search Publications
An X-ray view of HD 166734, a massive supergiant system
Nazé, Yaël; Mahy, Laurent; Gosset, Eric +1 more
The X-ray emission of the O+O binary HD 166734 was monitored using Swift and XMM-Newton observatories, leading to the discovery of phase-locked variations. The presence of an f line in the He-like triplets further supports a wind-wind collision as the main source of the X-rays in HD 166734. While temperature and absorption do not vary significantl…
On the dust and gas components of the z = 2.8 gravitationally lensed quasar host RX J0911.4+0551
Tuan-Anh, P.; Hoai, D. T.; Nhung, P. T. +4 more
Observations by the Atacama Large Millimetre/sub-millimetre Array of the 358 GHz continuum emission of the gravitationally lensed quasar host RX J0911.4+0551 have been analysed. They complement earlier Plateau de Bure Interferometer observations of the CO(7-6) emission. The good knowledge of the lensing potential obtained from the Hubble Space Tel…
Origin of Radio Enhancements in Type II Bursts in the Outer Corona
Valtonen, Eino; Pohjolainen, Silja; Al-Hamadani, Firas
We study interplanetary (IP) solar radio type II bursts from 2011 - 2014 in order to determine the cause of the intense enhancements in their radio emission. Type II bursts are known to be due to propagating shocks that are often associated with fast halo-type coronal mass ejections (CMEs). We analysed the radio spectral data and the white-light c…
The role of plasma slowdown in the generation of Rhea's Alfvén wings
Dougherty, Michele K.; Russell, Christopher T.; Fatemi, Shahab +5 more
Alfvén wings are known to form when a conducting or mass-loading object slows down a flowing plasma in its vicinity. Alfvén wings are not expected to be generated when an inert moon such as Rhea interacts with Saturn's magnetosphere, where the plasma impacting the moon is absorbed and the magnetic flux passes unimpeded through the moon. However, i…
2D kinematic study of the central region of NGC 4501
Rodrigues, I.; Repetto, P.; Faúndez-Abans, M. +2 more
Gemini Multi-Object Spectrograph and its Integral Field Unit observational data were used to study the detailed 2D gas kinematics and morphological structures within the ∼500 × 421 pc2 of the active Seyfert 2 galaxy NGC 4501. We provide empirical pieces of evidence of possible outflowing material from the central zones of NGC 4501 to th…
On-ground testing of the role of adhesion in the LISA-Pathfinder test mass injection phase
Bortoluzzi, D.; Zanoni, C.; Conklin, J. W.
Many space missions share the need to fly a free-falling body inside the spacecraft, as a reference for navigation and/or as a probe for the local gravitational field. When a mechanism is required to cage such an object during the launch phase, the need arises to release it to free-fall once the operational phase must be initiated in orbit. The cr…
Hubble Space Telescope Ultraviolet Light Curves Reveal Interesting Properties of CC Sculptoris and RZ Leonis
Szkody, Paula; Sion, Edward M.; Godon, Patrick +6 more
Time-tag ultraviolet data obtained on the Hubble Space Telescope in 2013 reveal interesting variability related to the white dwarf spin in the two cataclysmic variables RZ Leo and CC Scl. RZ Leo shows a period at 220 s and its harmonic at 110 s, thus identifying it as a likely Intermediate Polar (IP). The spin signal is not visible in a short sing…
Panchromatic spectral energy distributions of simulated galaxies: results at redshift z = 0
Annunziatella, Marianna; Obreja, Aura; Granato, Gian Luigi +5 more
We present predictions of spectral energy distributions (SEDs), from the UV to the FIR, of simulated galaxies at z = 0. These were obtained by post-processing the results of an N-body+hydro simulation of a cosmological box of side 25 Mpc, which uses the Multi-Phase Particle Integrator (MUPPI) for star formation and stellar feedback, with the grasi…
Propagation Characteristics of Two Coronal Mass Ejections from the Sun Far into Interplanetary Space
Wang, Rui; Liu, Ying D.; Hu, Huidong +1 more
Propagation of coronal mass ejections (CMEs) from the Sun far into interplanetary space is not well understood, due to limited observations. In this study we examine the propagation characteristics of two geo-effective CMEs, which occurred on 2005 May 6 and 13, respectively. Significant heliospheric consequences associated with the two CMEs are ob…
Study of the progenitor of the magnetar 1E 2259+586 through Suzaku observations of the associated supernova remnant CTB 109
Enoto, Teruaki; Makishima, Kazuo; Nakano, Toshio +4 more
We present a study of the progenitor of the magnetar 1E 2259+586, from Suzaku observations of the associated supernova remnant CTB 109. The Suzaku spectra, either spatially integrated or spatially resolved, were successfully described by a two-component plasma model, which reconfirms a previous Chandra result on the northwestern part of this remna…