Search Publications
Chromospheric activity in sunspot light bridges
Louis, R. E.
High-resolution filtergrams from Hinode were used to analyse the nature of chromospheric activity over a set of five sunspot light bridges. The broad-band Ca II H filtergrams depict a variety of phenomena which include large arc-shaped brightenings, bright patches, and small-scale jets. These strong brightenings are recurrent over a duration of se…
Spectroscopic study of the peculiar galaxy IC 883
Burenkov, A. N.; Karataeva, G. M.; Yakovleva, V. A. +3 more
We analyze new optical spectroscopic observations obtained at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences with the SCORPIO focal reducer (in the modes of a Fabry-Perot interferometer (FPI) and long-slit spectroscopy) and the Multi-Pupil Fiber Spectrograph for the galaxy IC 883. We have confirmed th…
The puzzling properties of the magnetic O star Tr16-22
Neiner, Coralie; Morrell, Nidia; Nazé, Yaël +4 more
Context. The detection of bright, hard, and variable X-ray emission in Tr16-22 prompted spectropolarimetric observations of this star, which in turn led to the discovery of a surface magnetic field.
Aims: We want to further constrain the properties of this star, in particular to verify whether X-ray variations are correlated to changes in opt…
Planetary science: Cometary dust under the microscope
Kolokolova, Ludmilla
The Rosetta spacecraft made history by successfully orbiting a comet. Data from the craft now reveal the structure of the comet's dust particles, shedding light on the processes that form planetary systems. See Letter p.73
Long term average distribution of O +
Wang, Jing; Cao, Jinbin; Liu, Wenlong
Cluster measurements from 2001 to 2011 provide a unique opportunity to study the characteristics of
First geodetic VLBI sessions with the Chinese Deep Space Stations Jiamusi and Kashi
Wang, Guangli; Xu, Dezhen; Dong, Guangliang +2 more
The first three 24-h S/X dual-band geodetic VLBI sessions using two new Chinese Deep Space Stations (CDSSs), Jiamusi and Kashi, and four Chinese VLBI Stations (CVSs), Beijing, Kunming, Seshan, and Urumqi were conducted with the goal of improving the two CDSSs' positions, which were previously known to a few decimeters. Due to the limited frequency…
Fundamental stellar parameters for selected T-Tauri stars in the Chamaeleon and Rho Ophiuchus star-forming regions
James, D. J.; Bouvier, J.; Santos, N. C. +4 more
We present the results of an optical photometry and high-resolution spectroscopy campaign for a modest sample of X-ray selected stars in the Chamaeleon and Rho Ophiuchus star-forming regions. With R∼ 50 000 optical spectra, we establish kinematic membership of the parent association and confirm stellar youth for each star in our sample. With the a…
Searching for X-ray sources in nearby late-type galaxies with low-star formation rates
Kaaret, P.; Poutanen, J.; Kajava, J. J. E. +4 more
Late-type non-starburst galaxies have been shown to contain X-ray emitting objects, some being ultraluminous X-ray sources. We report on XMM-Newton observations of 11 nearby, late-type galaxies previously observed with the Hubble Space Telescope (HST) in order to find such objects. We found 18 X-ray sources in or near the optical extent of the gal…
Erratum: Discovery of H I gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder
Forsyth, R.; Sault, R. J.; Heywood, I. +100 more
Altitude of the upper boundary of AAR based on observations of ion beams in inverted-V structures: A case study
Xie, Lun; Parks, George; Cui, YanBo +5 more
Outflowing ion beams forming four successive inverted-V structures in the energy-time spectrograms of H+, He+, and O+ were observed at an altitude of 3.4 RE by Cluster satellites travelling above the auroral acceleration region (AAR) in the southern hemisphere on February 14, 2001. Energization by negative U-shaped potential structures in the AAR …