Search Publications
The new primary X-ray component confirmed in the Seyfert I galaxy IC 4329A
Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya +2 more
The bright and highly variable Seyfert I active galactic nucleus IC 4329A was observed with Suzaku five times in 2007 August, with intervals of ∼5 days and a net exposure of 24-31 ks each. Another longer observation was carried out in 2012 August with a net exposure of 118 ks. In the six observations, a source was detected in 2-45 keV with an aver…
On the Retrieval of Mesospheric Winds on Mars and Venus from Ground-based Observations at 10 µm
Lopez-Valverde, M. A.; Sornig, M.; Sonnabend, G. +1 more
A detailed analysis is presented of ground-based observations of atmospheric emissions on Mars and Venus under non-local thermodynamic equilibrium (non-LTE) conditions at high spectral resolution. Our first goal is to comprehend the difficulties behind the derivation of wind speeds from ground-based observations. A second goal is to set a framewor…
The X-Ray Zurich Environmental Study (X-ZENS). II. X-Ray Observations of the Diffuse Intragroup Medium in Galaxy Groups
Schawinski, Kevin; Finoguenov, Alexis; Silverman, John D. +4 more
We present the results of a pilot XMM-Newton and Chandra program aimed at studying the diffuse intragroup medium (IGM) of optically selected nearby groups from the Zurich ENvironmental Study (ZENS) catalog. The groups are in a narrow mass range about {10}13 {M}⊙ , a mass scale at which the interplay between the IGM and the gr…
Multilayer modeling of the aureole photometry during the Venus transit: comparison between SDO/HMI and VEx/SOIR data
Vandaele, A. C.; Wilquet, V.; Mahieux, A. +4 more
Context. The mesosphere of Venus is a critical range of altitudes in which complex temperature variability has been extensively studied by the space mission Venus Express (VEx) during its eight-year mission (2006-2014). In particular, the Solar Occultation in the InfraRed (SOIR) instrument probed the morning and evening terminator in the 70-170 km…
Hot Plasma from Solar Active-Region Cores: Constraints from the Hinode X-Ray Telescope
Schmelz, J. T.; Christian, G. M.; Matheny, P. O.
Mechanisms invoked to heat the solar corona to millions of degrees kelvin involve either magnetic waves or magnetic reconnections. Turbulence in the convection zone produces MHD waves, which travel upward and dissipate. Photospheric motions continuously build up magnetic energy, which is released through magnetic reconnection. In this paper, we co…
Rosetta-Philae RF link, challenging communications from a comet
Dudal, Clément; Loisel, Céline
The Rosetta spacecraft reached the vicinity of the comet 67P/Churyumov-Gerasimenko in 2014 and released the lander Philae for an in-situ analysis through 10 scientific instruments. The analysis of the lander RF link telemetry reveals major information on the lander orientation and its near environment during the 50-h mission on the comet. The Phil…
A family for miniature, easily reconfigurable particle sensors for space plasma measurements
Barabash, S.; Wieser, M.
Over the last 15 years the Swedish Institute of Space Physics developed a line of miniaturized ion mass analyzers for space plasma studies with masses of 400-600 g and highly compact and dense design to minimize the volume. The sensors cover an energy range from few eV up to 15 keV and reach an angular coverage up to hemispherical and mass resolut…
Properties of galaxies at the faint end of the Hα luminosity function at z ~ 0.62
Villar, Víctor; Gallego, Jesús; Gómez-Guijarro, Carlos +3 more
Context. Studies measuring the star formation rate density, luminosity function, and properties of star-forming galaxies are numerous. However, it exists a gap at 0.5 < z < 0.8 in Hα-based studies.
Aims: Our main goal is to study the properties of a sample of faint Hα emitters at z ~ 0.62. We focus on their contribution to the faint end…
Sounding Rocket Observations of Active Region Soft X-Ray Spectra Between 0.5 and 2.5 nm Using a Modified SDO/EVE Instrument
Didkovsky, Leonid; Wieman, Seth; Moore, Christopher +2 more
Spectrally resolved measurements of individual solar active regions (ARs) in the soft X-ray (SXR) range are important for studying dynamic processes in the solar corona and their associated effects on the Earth's upper atmosphere. They are also a means of evaluating atomic data and elemental abundances used in physics-based solar spectral models. …
NUV Star Catalog from the Lunar-based Ultraviolet Telescope Survey: First Release
Wang, Jing; Meng, Xian-Min; Wei, Jian-Yan +7 more
We present a star catalog extracted from the Lunar-based Ultraviolet Telescope (LUT) survey program. LUT's observable sky area is a circular belt around the Moon's north pole, and the survey program covers a preferred area of about 2400 deg2 which includes a region of the Galactic plane. The data are processed with an automatic pipeline…