Search Publications
The XMM spectral catalog of SDSS optically selected Seyfert 2 galaxies
Jiménez-Andrade, E. F.; Ranalli, P.; Georgantopoulos, I. +6 more
We present an X-ray spectroscopic study of optically selected (SDSS) Seyfert 2 (Sy2) galaxies. The goal is to study the obscuration of Sy2 galaxies beyond the local universe, using good quality X-ray spectra in combination with high S/N optical spectra for their robust classification. We analyzed all available XMM-Newton archival observations of n…
Milne-Eddington inversion for unresolved magnetic structures in the quiet Sun photosphere
Bommier, Véronique
This paper is first devoted to present our method for modeling unresolved magnetic structures in the Milne-Eddington inversion of spectropolarimetric data. The related definitions and other approaches and different used inversion algorithms are recalled for comparison. In a second part, we apply our method to quiet Sun data outside active regions.…
Some new aspects of the transient ionization layer of comet Siding Spring origin in the Martian upper atmosphere
Venkateswara Rao, N.; Rao, S. V. B.; ManasaMohana, P. +1 more
The close encounter of comet Siding Spring with Mars resulted in the formation of a dense transient ionization layer in the Martian upper atmosphere at altitudes between 80 and 120 km. Instruments on three spacecraft orbiting Mars detected the presence of this layer, as reported in previous publications. In this study, we reanalyzed the ionograms …
The spatially resolved correlation between [NII] 205 µm line emission and the 24 µm continuum in nearby galaxies
Ibar, E.; De Looze, I.; Cormier, D. +12 more
A correlation between the 24 µm continuum and the [Nii] 205 µm line emission may arise if both quantities trace the star formation activity on spatially-resolved scales within a galaxy, yet has so far only been observed in the nearby edge-on spiral galaxy NGC 891. We therefore assess whether the [Nii] 205-24 µm emission correlati…
Gaia
Cacciari, C.; Pancino, E.; Bellazzini, M.
A review of the Gaia mission and its science performance after one year of operations will be presented, and the contribution to reconstructing the history of the Milky Way will be outlined.
Radial profiles of the Phoebe ring: A vast debris disk around Saturn
Hamilton, Douglas P.; Hedman, Matthew M.; Burns, Joseph A. +2 more
We present observations at optical wavelengths with the Cassini Spacecraft's Imaging Science System of the Phoebe ring, a vast debris disk around Saturn that seems to be collisionally generated by its irregular satellites. The analysis reveals a radial profile from 80-260 Saturn radii (RS) that changes behavior interior to ≈110RS
Orbits for Nine Binaries and One Linear Solution
Cvetković, Z.; Pavlović, R.; Ninković, S.
The subject of the present paper is the analysis of the orbital elements for nine binaries: WDS 00463-0634 = HDS 101, WDS 03264+3520 = HDS 430, WDS 03307-1926 = HDS 441, WDS 04025+0638 = HDS 510, WDS 09252+4606 = HDS 1353, WDS 09446+6459 = CHR 176, WDS 10294+1211 = HDS 1507, WDS 10596+1800 = HDS 1568, and WDS 14562+1745 = HDS 2108. The orbital ele…
Subsurface Characterization of 67P/Churyumov-Gerasimenko’s Abydos Site
Jorda, L.; Lamy, P.; Mousis, O. +12 more
On 2014 November 12, the ESA/Rosetta descent module Philae landed on the Abydos site of comet 67P/Churyumov-Gerasimenko. Aboard this module, the Ptolemy mass spectrometer measured a CO/CO2 ratio of 0.07 ± 0.04, which differs substantially from the value obtained in the coma by the Rosetta/ROSINA instrument, suggesting a heterogeneity in…
Observations of diffusion in the electron halo and strahl
Goldstein, Melvyn L.; Gurgiolo, Chris
Observations of the three-dimensional solar wind electron velocity distribution functions (VDF) using ϕ-θ plots often show a tongue of electrons that begins at the strahl and stretches toward a new population of electrons, termed the proto-halo, that exists near the projection of the magnetic field opposite that associated with the strahl. The ene…
Starbursting brightest cluster galaxy: a Herschel view of the massive cluster MACS J1931.8-2634
Altieri, B.; Valtchanov, I.; Grillo, C. +9 more
We investigate the dust-obscured star formation (SF) properties of the massive, X-ray-selected galaxy cluster MACS J1931.8-2634 at z = 0.352. Using far-infrared (FIR) imaging in the range 100-500 µm obtained with the Herschel telescope, we extract 31 sources (2σ) within r ∼ 1 Mpc from the brightest cluster galaxy (BCG). Among these sources, …