Search Publications
Constraints on the subsurface structure and density of the nucleus of Comet 67P/Churyumov-Gerasimenko from Arecibo radar observations
Lamy, P. L.; Toth, I.; Herique, A. +1 more
Context. Little is known about the internal structure of cometary nuclei. In addition to understanding their accretion in the early solar nebula and their subsequent evolution in the solar system, we find this question to be of acute and timely interest in the case of 67P/Churyumov-Gerasimenko (hereafter 67P/C-G) due to be visited by the Rosetta s…
Hierarchical analysis of the quiet-Sun magnetism
Asensio Ramos, A.; Martínez González, M. J.
Standard statistical analysis of the magnetic properties of the quiet Sun rely on simple histograms of quantities inferred from maximum-likelihood estimations. Because of the inherent degeneracies, either intrinsic or induced by the noise, this approach is not optimal and can lead to highly biased results. We carried out a meta-analysis of the mag…
A phenomenological model for the intracluster medium that matches X-ray and Sunyaev-Zel'dovich observations
Pfrommer, Christoph; Prada, Francisco; Zandanel, Fabio
Cosmological hydrodynamical simulations of galaxy clusters are still challenged to produce a model for the intracluster medium that matches all aspects of current X-ray and Sunyaev-Zel'dovich observations. To facilitate such comparisons with future simulations and to enable realistic cluster population studies for modelling e.g. non-thermal emissi…
Phobos and Deimos cartography
Oberst, J.; Wählisch, M.; Willner, K. +7 more
This paper presents an overview of developments in the cartography of the Martian moons Phobos and Deimos from the early satellite images to recent maps based on data from past and on-going Mars missions, especially Viking and Mars Express. We describe in detail the definition and use of special projections for these irregular-shaped bodies. New c…
Spectroscopic analysis in the virtual observatory environment with SPLAT-VO
Jenness, T.; Draper, P. W.; Škoda, P. +2 more
SPLAT-VO is a powerful graphical tool for displaying, comparing, modifying and analysing astronomical spectra, as well as searching and retrieving spectra from services around the world using Virtual Observatory (VO) protocols and services. The development of SPLAT-VO started in 1999, as part of the Starlink StarJava initiative, sometime before th…
Core and Wing Densities of Asymmetric Coronal Spectral Profiles: Implications for the Mass Supply of the Solar Corona
Young, P. R.; Klimchuk, J. A.; Patsourakos, S.
Recent solar spectroscopic observations have shown that coronal spectral lines can exhibit asymmetric profiles, with enhanced emissions at their blue wings. These asymmetries correspond to rapidly upflowing plasmas at speeds exceeding ≈50 km s-1. Here, we perform a study of the density of the rapidly upflowing material and compare it wi…
The ultraviolet to far-infrared spectral energy distribution of star-forming galaxies in the redshift desert
Cepa, J.; Magdis, G.; Oteo, I. +6 more
We analyse the rest-frame ultraviolet (UV) to near-infrared (near-IR) spectral energy distribution (SED) of Lyman-break galaxies (LBGs), star-forming (SF) BzK (sBzK) and UV-selected galaxies at 1.5 ≲ z ≲ 2.5 in the COSMOS, GOODS-N and GOODS-S fields. Additionally, we complement the multiwavelength coverage of the galaxies located in the GOODS fiel…
Temperature and entropy profiles to the virial radius of the Abell 1246 cluster observed with Suzaku
Sato, Kosuke; Ohashi, Takaya; Yamasaki, Noriko Y. +2 more
We report properties of the intracluster medium (ICM) in Abell 1246 to the virial radius (r200) and further outside as observed with Suzaku. The ICM emission is clearly detected to r200, and we derive profiles of electron temperature, density, entropy, and cluster mass based on the spectral analysis. The temperature shows var…
A search for Fermi bursts associated with supernovae and their frequency of occurrence
Della Valle, M.; Li, L.; Wang, Y. +7 more
Context. Observations suggest that most long duration gamma-ray bursts (GRBs) are connected with broad-line supernovae Ib/c, (SNe-Ibc). The presence of GRB-SNe is revealed by rebrightenings emerging from the optical GRB afterglow 10-15 days, in the rest-frame of the source, after the prompt GRB emission.
Aims: Fermi/GBM has a field of view (F…
A comprehensive NMR structural study of Titan aerosol analogs: Implications for Titan's atmospheric chemistry
Smith, Mark A.; He, Chao
Titan has a thick atmosphere composed primarily of nitrogen and methane. Complex organic chemistry induced by solar ultraviolet radiation and energetic particles, takes place in Titan's upper atmosphere, producing an optically thick reddish brown carbon based haze encircling this moon. The chemistry in Titan's atmosphere and its resulting chemical…