Search Publications
Assessment of Phobos gravity field determination from both near polar and near equatorial orbital flyby data
Andert, T.; Li, F.; Yan, J. G. +5 more
The C20 and C22 coefficients of the Phobos gravity field are key parameters to constrain the internal structure of the Martian moon, but reliable observed values of these parameters are still missing. In this paper, we demonstrate, through a combination of forward and inverse modelling of simulated Doppler spacecraft tracking…
Galactic or extragalactic chemical tagging for NGC 3201?. Discovery of an anomalous CN-CH relation
Dias, B.; Saker, L.; Shokry, A. +2 more
Context. The origin of the globular cluster (GC) NGC 3201 is under debate. Its retrograde orbit points to an extragalactic origin, but no further chemical evidence supports this idea. Light-element chemical abundances are useful to tag GCs and can be used to shed light on this discussion.
Aims: Recently it was shown that the CN and CH indices…
Narrow vs. broad-line Seyfert 1 galaxies: X-ray, optical, and mid-infrared AGN characteristics
Popović, Luka Č.; Lakićević, Maša; Kovačević-Dojčinović, Jelena
investigated narrow-line Seyfert 1 galaxies (NLS1s) at optical, mid-infrared (MIR), and X-ray wavelengths, comparing them to the broad-line active galactic nuclei (BLAGNs). We found that black hole mass, coronal line luminosities, X-ray hardness ratio and X-ray, and optical and MIR luminosities are higher for the BLAGNs than for NLS1s, while polic…
Search for Candidate Objects with the Sunyaev–Zeldovich Effect in the Radio Source Vicinities—galaxies: clusters: general
Verkhodanov, O. V.; Solovyov, D. I.; Khabibullina, M. L. +2 more
Based on the data from the Westerbork Northern Sky Survey performed at a frequency of 325 MHz in the range of right ascensions 0h ≤ α < 2h and declinations 29° < δ < 78° and using multi-frequency Planck maps, we selected candidate objects with the Sunyaev–Zeldovich effect. The list of the most probable candidates inc…
Detecting Variability in Massive Astronomical Time-series Data. III. Variable Candidates in the SuperWASP DR1 Found by Multiple Clustering Algorithms and a Consensus Clustering Method
Chang, Seo-Won; Kim, Dae-Won; Kim, Myung-Jin +3 more
We determine candidate variable sources in the SuperWASP Data Release 1 (DR1) using multiple clustering methods and identifying variable candidates as outliers from large clusters. We extract 15,788,814 light curves that have more than 15 photometric measurements in the SuperWASP DR1. Variations in the light curves are described in terms of nine v…
Low velocity collisions of porous planetesimals in the early solar system
Kührt, E.; Davidsson, B.; Hviid, S. +1 more
The ESA Rosetta mission has shown that Comet 67P/Churuymov-Gerasimenko is bi-lobed, has a high average porosity of around 70%, does not have internal cavities on size scales larger than 10 m, the lobes could have individual sets of onion shell-like layering, and the nucleus surface contains 100 m-scale cylindrical pits. It is currently debated whe…
Hour time-scale QPOs in the X-ray and radio emission of LS I +61°303
Cimò, G.; Chernyakova, M.; Massi, M. +2 more
LS I +61°303 is an X-ray binary with a radio outburst every ∼27 d. Previous studies of the stellar system revealed radio microflares superimposed on the large radio outburst. We present here new radio observations of LS I +61°303 at 2.2 GHz with the Westerbork Synthesis Radio Telescope (WSRT). Using various timing analysis methods, we find signifi…
Equatorial Noise With Quasiperiodic Modulation: Multipoint Observations by the Van Allen Probes Spacecraft
Hospodarsky, G. B.; Kurth, W. S.; Santolík, O. +2 more
Electromagnetic wave measurements performed by the two Van Allen Probes spacecraft are used to analyze equatorial noise emissions with a quasiperiodic modulation of the wave intensity. These waves are confined to the vicinity of the geomagnetic equator, and they occur primarily on the dayside. In situ plasma number density measurements are used to…
Global photometric analysis of Galactic HII regions
Kirsanova, Maria S.; Topchieva, Anastasiia; Wiebe, Dmitri
Total infrared fluxes are estimated for 99 HII regions around massive stars. The following wavebands have been used for the analysis: 8 and 24 µm, based on data from the Spitzer Space Telescope (IRAC and MIPS, respectively); 70, 160, 250, 350 and 500 µm, based on data from the Herschel Space Observatory (PACS and SPIRE). The estimated …
The character of the warm ionized medium
Geyer, Marisa; Walker, Mark A.
Herschel observations of far-infrared N+ emission lines have demonstrated that dense plasma, with n_ e∼ 30 cm^{-3}, is ubiquitous in the inner Galactic plane. By combining the information from Herschel with other tracers of ionized gas, we build a picture of this dense plasma. We adopt a collisional ionization model, so the analysis is …