Search Publications
Current Sheet Structures Observed by the TESIS EUV Telescope during a Flux Rope Eruption on the Sun
Reva, A. A.; Ulyanov, A. S.; Kuzin, S. V.
We use the TESIS EUV telescope to study the current sheet signatures observed during flux rope eruption. The special feature of the TESIS telescope was its ability to image the solar corona up to a distance of 2 {R}⊙ from the Sun’s center in the Fe 171 Å line. The Fe 171 Å line emission illuminates the magnetic field lines, and the TES…
Space Weather at Comet 67P/Churyumov–Gerasimenko Before its Perihelion
Odstrcil, D.; Goldstein, R.; Richter, I. +8 more
Interplanetary scintillation observations, as well as the ENLIL 3D-MHD model when employed either separately or in combination with the observations, enable the making of predictions of the solar wind density and speed at locations in the inner heliosphere. Both methods are utilized here to predict the arrival at the Rosetta spacecraft and its adj…
Orbits of 12 Southern Binaries Based on Soar Speckle Observations
Docobo, J. A.; Mendez, R. A.; Campo, P. P. +1 more
New data obtained with the 4.1 m Southern Astrophysical Research (SOAR) telescope at Cerro Pachón, Chile, allowed us to revise the orbits and system masses of the following southern visual double stars: WDS 01477-4358 (I 52), WDS 01500-0408 (A 2602), WDS 02514-2139 (DON 43), WDS 03189-0101 (BU 1177), WDS 04142-4608 (RST 2338), WDS 06274-2544 (B 11…
New orbital ephemerides for the dipping source 4U 1323-619: constraining the distance to the source
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Context. 4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) h and a distance from the source that is lower than 11 kpc has been proposed.
Aims: We aim to obtain the orbital ephemeris, the orbital period of the system, as well as its derivati…
The XMM Cluster Survey: evolution of the velocity dispersion-temperature relation over half a Hubble time
Hilton, Matt; Stott, John P.; Thomas, Peter A. +26 more
We measure the evolution of the velocity dispersion-temperature (σv-TX) relation up to z = 1 using a sample of 38 galaxy clusters drawn from the XMM Cluster Survey. This work improves upon previous studies by the use of a homogeneous cluster sample and in terms of the number of high-redshift clusters included. We present here…
A case study of a density structure over a vertical magnetic field region in the Martian ionosphere
Gurnett, D. A.; Lundin, R.; Morgan, D. D. +3 more
One of the discoveries made by the radar sounder on the Mars Express spacecraft is the existence of magnetically controlled structures in the ionosphere of Mars, which result in bulges in the ionospheric electron density contours. These bulges lead in turn to oblique echoes, which show up as hyperbola-shaped features in the echograms. A hyperbola-…
The spatially resolved dynamics of dusty starburst galaxies in a z ∼ 0.4 cluster: beginning the transition from spirals to S0s
Smail, Ian; Swinbank, A. M.; Bower, R. G. +4 more
To investigate what drives the reversal of the morphology-density relation at intermediate/high redshift, we present a multiwavelength analysis of 27 dusty starburst galaxies in the massive cluster Cl 0024+17 at z = 0.4. We combine Hα dynamical maps from the VLT/FLAMES multi-IFU system with far-infrared imaging using Herschel/SPIRE and millimetre …
Examining the angular resolution of the ASTRO-H's soft x-ray telescopes
Maeda, Yoshitomo; Ishida, Manabu; Okajima, Takashi +12 more
The international x-ray observatory ASTRO-H was renamed "Hitomi" after launch. It covers a wide energy range from a few hundred eV to 600 keV. It is equipped with two soft x-ray telescopes (SXTs: SXT-I and SXT-S) for imaging the soft x-ray sky up to ∼12 keV, which focus an image onto the respective focal-plane detectors: CCD camera (SXI) and a cal…
Intensity Conserving Spectral Fitting
Klimchuk, J. A.; Patsourakos, S.; Tripathi, D.
The detailed shapes of spectral-line profiles provide valuable information about the emitting plasma, especially when the plasma contains an unresolved mixture of velocities, temperatures, and densities. As a result of finite spectral resolution, the intensity measured by a spectrometer is the average intensity across a wavelength bin of non-zero …
CRDS with a VECSEL for broad-band high sensitivity spectroscopy in the 2.3 µm window
Campargue, A.; Vasilchenko, S.; Mondelain, D. +9 more
The integration of an industry ready packaged Sb-based Vertical-External-Cavity Surface-Emitting-Laser (VECSEL) into a Cavity Ring Down Spectrometer (CRDS) is presented. The instrument operates in the important 2.3 µm atmospheric transparency window and provides a high sensitivity (minimum detectable absorption of 9 × 10-11 cm