Search Publications
Continuous monitoring of pulse period variations in Hercules X-1 using Swift/BAT
Klochkov, D.; Santangelo, A.; Staubert, R. +2 more
Context: Monitoring of pulse period variations in accreting binary pulsars is an important tool to study the interaction between the magnetosphere of the neutron star and the accretion disk. While the X-ray flux of the brightest X-ray pulsars have been successfully monitored over many years (e.g. with RXTE/ASM, CGRO/BATSE, Swift/BAT), the possibil…
Venus express: Highlights of the nominal mission
Fedorov, A.; Barabash, S.; Sauvaud, J. -A. +18 more
Venus Express is the first European (ESA) mission to the planet Venus. Its main science goal is to carry out a global survey of the atmosphere, the plasma environment, and the surface of Venus from orbit. The payload consists of seven experiments. It includes a powerful suite of remote sensing imagers and spectrometers, instruments for in-situ inv…
Analysis of a cryolava flow-like feature on Titan
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +11 more
This paper reports on the analysis of the highest spatial resolution hyperspectral images acquired by the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini spacecraft during its prime mission. A bright area matches a flow-like feature coming out of a caldera-like feature observed in Synthetic Aperture Radar (SAR) data recorded by…
On the Radial Distribution of Horizontal Branch Stars in NGC 2808
Walker, A. R.; Degl'Innocenti, S.; Zoccali, M. +18 more
We present accurate new ultraviolet and optical BVI photometry for the Galactic globular cluster NGC 2808 based on both ground-based and archival Hubble Space telescope imagery. From this we have selected a sample of ~2000 Horizontal Branch (HB) stars; given the extensive wavelength range considered and the combination of both high angular resolut…
Spectroscopic Signatures of the Superorbital Period in the Neutron Star Binary LMC X-4
Lee, Julia C.; Nowak, Michael A.; Neilsen, Joseph +2 more
We present the first high-resolution X-ray study of emission line variability with superorbital phase in the neutron star binary LMC X-4. Our analysis provides new evidence from X-ray spectroscopy confirming accretion disk precession as the origin of the superorbital period. The spectra, obtained with the Chandra High-Energy Transmission Grating S…
A Collimated, Ionized Bipolar Structure and a High Density Torus in the Planetary Nebula IRAS 17347-3139
de Gregorio-Monsalvo, I.; Anglada, G.; Tafoya, D. +5 more
We present observations of continuum (λ = 0.7, 1.3, 3.6, and 18 cm) and OH maser (λ = 18 cm) emission toward the young planetary nebula IRAS 17347-3139, which is one of the three planetary nebulae that are known to harbor water maser emission. From the continuum observations, we show that the ionized shell of IRAS 17347-3139 consists of two main s…
Variable Stars in the Globular Cluster NGC 6752
Thompson, I. B.; Kaluzny, J.
We report time-series photometry for 16 variable stars located in the central part of the globular cluster NGC 6752. The sample includes 13 newly identified objects. The precision of our differential photometry ranges from 1 mmag at V=14.0 mag to 10 mmag at V=18.0 mag. We detected four low amplitude variables located on the extended horizontal bra…
Counterstreaming Beams and Flat-Top Electron Distributions Observed with Langmuir, Whistler, and Compressional Alfvén Waves in Earth's Magnetic Tail
Parks, George K.; Teste, Alexandra
Relevant new clues to wave-particle interactions have been obtained in Earth’s plasma sheet (PS). The plasma measurements made on Cluster spacecraft show that broadband (∼2-6kHz) electrostatic emissions, in the PS boundary layer, are associated with cold counterstreaming electrons flowing at 5-12×103kms-1 through hot Maxwelli…
Comparison of the sidereal angular velocity of subphotospheric layers and small bright coronal structures during the declining phase of solar cycle 23
Roth, M.; Corbard, T.; Wöhl, H. +2 more
Context: We compare solar differential rotation of subphotospheric layers derived from local helioseismology analysis of GONG++ dopplergrams and the one derived from tracing small bright coronal structures (SBCS) using EIT/SOHO images for the period August 2001-December 2006, which correspond to the declining phase of solar cycle 23.
Aims: The…
Photometric redshift accuracy in AKARI deep surveys
Im, M.; Lee, H. M.; Burgarella, D. +11 more
We investigate the photometric redshift accuracy achievable with the AKARI infrared data in deep multiband surveys, such as in the North Ecliptic Pole field. We demonstrate that the passage of redshifted polycyclic aromatic hydrocarbons (PAH) and silicate features into the mid-infrared wavelength window covered by AKARI is a valuable means to reco…