Search Publications
A new model for the X-ray continuum of the magnetized accreting pulsars
Ferrigno, Carlo; Becker, Peter A.; Bozzo, Enrico +1 more
Context. Accreting highly magnetized pulsars in binary systems are among the brightest X-ray emitters in our Galaxy. Although a number of high-quality broad-band (0.1-100 keV) X-ray observations are available, the spectral energy distribution of these sources is usually investigated by adopting pure phenomenological models rather than models linke…
Low-ionization structures in planetary nebulae - I. Physical, kinematic and excitation properties
Gonçalves, Denise R.; Akras, Stavros
Though the low-ionization small-scale structures (LISs) such as knots, filaments and jets of planetary nebulae (PNe) are known for ∼30 yr, some of their observational properties are not well established. In consequence, our ability to include them in the wider context of the formation and evolution of PNe is directly affected. Why most structures …
Origin of central abundances in the hot intra-cluster medium. I. Individual and average abundance ratios from XMM-Newton EPIC
Zhang, Y. -Y.; Kaastra, J. S.; Mernier, F. +5 more
The hot intra-cluster medium (ICM) is rich in metals, which are synthesised by supernovae (SNe) explosions and accumulate over time into the deep gravitational potential well of clusters of galaxies. Since most of the elements visible in X-rays are formed by type Ia (SNIa) and/or core-collapse (SNcc) supernovae, measuring their abundances gives us…
Electron hybrid code simulation of whistler-mode chorus generation with real parameters in the Earth's inner magnetosphere
Katoh, Yuto; Omura, Yoshiharu
We carry out a self-consistent simulation of the generation process of whistler-mode chorus by a spatially one-dimensional electron hybrid code, by assuming the magnetic field inhomogeneity corresponding to L = 4 of the dipole field. Chorus emissions with rising tones are reproduced in the simulation result, while the frequency range, sweep rate, …
Carbon to oxygen ratios in extrasolar planetesimals
Gänsicke, Boris T.; Koester, Detlev; Farihi, Jay +1 more
Observations of small extrasolar planets with a wide range of densities imply a variety of planetary compositions and structures. Currently, the only technique to measure the bulk composition of extrasolar planetary systems is the analysis of planetary debris accreting on to white dwarfs, analogous to abundance studies of meteorites. We present me…
Catalog of positions and B-magnitudes of stars in the circumpolar region of the Northern Sky Survey (FON) project
Andruk, V. M.; Pakuliak, L. K.; Golovnia, V. V. +4 more
The catalog of equatorial coordinates α and δ and B-magnitudes of stars has been created at the Main Astronomical Observatory, National Academy of Sciences of Ukraine (MAO NASU), for the circumpolar region (from 58° to 90°) of the Northern Sky Survey (FON) project within the work on the rational use of resources accumulated in the JDA (Joint Digit…
A search for a keV signature of radiatively decaying dark matter with Suzaku XIS observations of the X-ray diffuse background
Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Sekiya, Norio
We performed the deepest search for an X-ray emission line at between 0.5 and 7 keV from non-baryonic dark matter by the Suzaku XIS. Dark matter associated with the Milky Way was selected as the target to obtain the best signal-to-noise ratio. From the Suzaku archive, we selected 187 data sets of blank-sky regions that were dominated by the X-ray …
Origin of central abundances in the hot intra-cluster medium. II. Chemical enrichment and supernova yield models
Zhang, Y. -Y.; Kaastra, J. S.; Mernier, F. +7 more
The hot intra-cluster medium (ICM) is rich in metals, which are synthesised by supernovae (SNe) and accumulate over time into the deep gravitational potential well of clusters of galaxies. Since most of the elements visible in X-rays are formed by type Ia (SNIa) and/or core-collapse (SNcc) supernovae, measuring their abundances gives us direct inf…
Suprathermal electrons near the nucleus of comet 67P/Churyumov-Gerasimenko at 3 AU: Model comparisons with Rosetta data
Henri, P.; Edberg, N. J. T.; Goldstein, R. +10 more
Observations of the coma near the nucleus of comet 67P/Churyumov-Gerasimenko (67P) made by the IES (Ion and Electron Sensor) instrument onboard the Rosetta Orbiter during late 2014 showed that electron fluxes greatly exceeded solar wind electron fluxes. The IES is part of the Rosetta Plasma Consortium. This paper reports on electron energy spectra…
SN 2015U: a rapidly evolving and luminous Type Ibn supernova
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +7 more
Supernova (SN) 2015U (also known as PSN J07285387+3349106) was discovered in NGC 2388 on 2015 Feb. 11. A rapidly evolving and luminous event, it showed effectively hydrogen-free spectra dominated by relatively narrow helium P-Cygni spectral features and it was classified as an SN Ibn. In this paper, we present photometric, spectroscopic, and spect…