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Double Stars and Astrometric Uncertainties in Gaia DR1
Makarov, Valeri V.; Frouard, Julien; Fabricius, Claus
A significant number of double stars with separations up to 2.5 arcsec are present in the Gaia Data Release 1 astrometric catalogs. Limiting our analysis to a well-studied sample of 1124 doubles resolved by Hipparcos, provided with individual Tycho component photometry and cross-matched with the TGAS catalog, we estimate a rate of at least 3% for …
Constraining the break of spatial diffeomorphism invariance with Planck data
Alcaniz, J. S.; Graef, L. L.; Benetti, M.
The current most accepted paradigm for the early universe cosmology, the inflationary scenario, shows a good agreement with the recent Cosmic Microwave Background (CMB) and polarization data. However, when the inflation consistency relation is relaxed, these observational data exclude a larger range of red tensor tilt values, prevailing the blue o…
Mutated hybrid inflation on brane and reheating temperature
Ferricha-Alami, M.; Sakhi, Z.; Chakir, H. +1 more
In the mutated hybrid-inflation standard case, the spectral index
SPIN: An Inversion Code for the Photospheric Spectral Line
Mathew, Shibu K.; Yadav, Rahul; Tiwary, Alok Ranjan
Inversion codes are the most useful tools to infer the physical properties of the solar atmosphere from the interpretation of Stokes profiles. In this paper, we present the details of a new Stokes Profile INversion code (SPIN) developed specifically to invert the spectro-polarimetric data of the Multi-Application Solar Telescope (MAST) at Udaipur …
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…