Search Publications

Radio reflection imaging of asteroid and comet interiors I: Acquisition and imaging theory

Sava, Paul; Ittharat, Detchai; Grimm, Robert +1 more

Imaging the interior structure of comets and asteroids can provide insight into their formation in the early Solar System, and can aid in their exploration and hazard mitigation. Accurate imaging can be accomplished using broadband wavefield data penetrating deep inside the object under investigation. This can be done in principle using seismic sy…

Microwave thermal emission from the zodiacal dust cloud predicted with contemporary meteoroid models

Schwarz, Dominik J.; Dikarev, Valery V.

Predictions of the microwave thermal emission from the zodiacal dust cloud are made using several contemporary meteoroid models to construct the distributions of the cross-section area of dust in space, and by applying the Mie light-scattering theory to estimate the temperatures and emissivities of dust particles in a wide range of sizes and helio…

Investigation of scaling properties of a thin current sheet by means of particle trajectories study

Sasunov, Yu. L.; Khodachenko, M. L.; Alexeev, I. I. +4 more

A thin current sheet (TCS), with the width of an order of thermal proton gyroradius, appears a fundamental physical object which plays an important role in structuring of major magnetospheric current systems (magnetotail, magnetodisk, etc.). The TCSs are nowadays under extensive study by means of space missions and theoretical models. We consider …

Inflation in de Sitter spacetime and CMB large scale anomaly

Zhao, Dong; Li, Ming-Hua; Wang, Ping +1 more

The influence of cosmological constant-type dark energy in the early universe is investigated. This is accommodated by a new dispersion relation in de Sitter spacetime. We perform a global fit to explore the cosmological parameter space by using the CosmoMC package with the recently released Planck TT and WMAP polarization datasets. Using the resu…

Matching of Large Images Through Coupled Decomposition

Muller, Jan-Peter; Sidiropoulos, Panagiotis

A method for inverting the touchdown shock of the Philae lander on comet 67P/Churyumov-Gerasimenko

Arnold, Walter; Seidensticker, Klaus J.; Fischer, Hans-Herbert +7 more

The landing of Philae on comet 67P/Churyumov-Gerasimenko is scheduled for November 12th, 2014. Each of the three landing feet houses in one sole a tri-axial acceleration sensor of the Comet Acoustic Surface Sounding Experiment (CASSE). They will thus be the first sensors to be in mechanical contact with the comet surface. CASSE will be in listenin…

Witnessing Gas Mixing in the Metal Distribution of the Hickson Compact Group HCG 31

Mendes de Oliveira, C.; de Mello, D. F.; Amram, P. +3 more

We present for the first time direct evidence that in a merger of disk galaxies, the pre-existing central metallicities will mix as a result of gas being transported in the merger interface region along the line that joins the two coalescing nuclei. This is shown using detailed two-dimensional kinematics as well as metallicity measurements for the…

Herschel SPIRE-FTS observations of RCW 120

Abergel, A.; Le Bourlot, J.; Le Petit, F. +5 more

Context. The expansion of Galactic H ii regions can trigger the formation of a new generation of stars. However, little is know about the physical conditions that prevail in these regions.
Aims: We study the physical conditions that prevail in specific zones towards expanding H ii regions that trace representative media such as the photodisso…

Broad Balmer Wings in BA Hyper/Supergiants Distorted by Diffuse Interstellar Bands: Five Examples in the 30 Doradus Region from the VLT-FLAMES Tarantula Survey

Walborn, Nolan R.; Sana, Hugues; Ulaczyk, Krzysztof +11 more

Extremely broad emission wings at Hβ and Hα have been found in VLT-FLAMES Tarantula Survey data for five very luminous BA supergiants in or near 30 Doradus in the Large Magellanic Cloud. The profiles of both lines are extremely asymmetrical, which we have found to be caused by very broad diffuse interstellar bands (DIBs) in the longward wing of Hβ…

Sample of optically unidentified X-ray binaries in the Galactic bulge: constraints on the physical nature from infrared photometric surveys

Zolotukhin, Ivan Yu.; Revnivtsev, Mikhail G.

We report on archival near-infrared and mid-infrared observations of seven persistent X-ray sources situated in the Galactic bulge, using data from the UK Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS), the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) and the Wide-field Infrared Survey Explorer (WISE) al…