Search Publications
Multiscale analysis of the CMB temperature derivatives
Martínez-González, E.; Vielva, P.; Marcos-Caballero, A.
We study the Planck CMB temperature at different scales through its derivatives up to second order, which allows one to characterize the local shape and isotropy of the field. The problem of having an incomplete sky in the calculation and statistical characterization of the derivatives is addressed in the paper. The analysis confirms the existence…
CXO J004318.8+412016, a steady supersoft X-ray source in M 31
Luna, G. J. M.; Della Valle, M.; de Martino, D. +15 more
We obtained an optical spectrum of a star we identify as the optical counterpart of the M31 Chandra source CXO J004318.8+412016, because of prominent emission lines of the Balmer series, of neutral helium, and a He II line at 4686 Å. The continuum energy distribution and the spectral characteristics demonstrate the presence of a red giant of K or …
Probability densities of the effective neutrino masses mβ and mββ
Meloni, Davide; Di Iura, Andrea
We compute the probability densities of the effective neutrino masses mβ and mββ using the Kernel Density Estimate (KDE) approach applied to a distribution of points in the (mmin ,mββ) and (mβ ,mββ) planes, obtained using the available Probability Distribution Functions (PDFs) of th…
First results from the use of the relativistic and slim disc model SLIMULX in XSPEC
Castro-Tirado, A. J.; Dovčiak, M.; Karas, V. +3 more
Ultra-Luminous X-ray sources (ULXs) are accreting black holes for which their X-ray properties have been seen to be different to the case of stellar-mass black hole binaries. For most of the cases their intrinsic energy spectra are well described by a cold accretion disc (thermal) plus a curved high-energy emission components. The mass of the blac…
The properties of red giant stars along the Sagittarius tidal tails
Zhang, X.; Zhou, L.; Zhao, G. +10 more
Aims: We aim to measure the metallicity distribution and velocity distribution of red giant branch (RGB) stars along the Sagittarius dwarf galaxy (Sgr) streams. Thanks to the large number of stars of the Sloan Digital Sky Survey (SDSS) sample, we can study the properties of streams as a function of the Λ⊙ from the Sgr core.
Me…
Evaluation of a possible upgrade of the IAU 2006 precession
Liu, J. -C.; Capitaine, N.
Context. The International Astronomical Union (IAU) adopted a new precession model at its 2006 General Assembly. After more than ten years since the publication of the so-called IAU 2006 precession, we have noticed progress in solar system ephemerides and geophysical observations, which can be used to refine the precession model. Another progress …
Gyrophase bunched ions in the plasma sheet
Wang, Zhiqiang; Zhai, Hao; Gao, Zhuxiu +1 more
Gyrophase bunched ions were first detected in the upstream region of the Earth's bow shock in the early 1980s which is formed by the microphysical process associated with reflected solar wind ions at the bow shock. Inside the magnetosphere, the results of computer simulations demonstrated that nonlinear wave-particle interaction can also result in…
Properties of the Tycho-2 catalogue from Gaia data release
Tsvetkov, A. S.; Vityazev, V. V.; Petrov, S. D. +2 more
Based on the measurements performed in the first 14 months of Gaia operation, we have solved the problem of obtaining the systematic differences between the stellar positions and proper motions of the TGAS (Tycho-Gaia Astrometric Solution) and Tycho-2 catalogues. By dividing the common stars from the TGAS and Tycho-2 catalogues into three G-magnit…
Electron temperature anisotropy associated to field-aligned currents in the Earth's magnetosphere inferred from Rosetta MIP-RPC observations during 2009 flyby
Henri, P.; Hamelin, M.; Béghin, C. +3 more
A new approach is proposed for data interpretation of the Mutual Impedance Probe (MIP) instrument from the Rosetta Plasma Consortium (RPC) during the 2009 Earth's flyby gravity assist through the magnetosphere, from dusk to dawn regions. The spacecraft trajectory of ±8 RE (Earth's radius) was crossing several structures of field-aligned…
Neoproterozoic Rosetta Gabbro from northernmost Arabian-Nubian Shield, south Jordan: Geochemistry and petrogenesis
Miller, Nathan; Jarrar, Ghaleb H.; Stern, Robert J. +6 more
An Ediacaran mafic intrusion of south Jordan is a distinctive appinitic igneous rock with a possibly unique texture, characterized by spherical clots up to 40 mm in diameter composed of amphibole cores from which plagioclase euhedra radiate; we call it the Rosetta Gabbro. It is exposed as a small (ca. 750 m2) outcrop in the Neoproterozo…