Search Publications
XMM-Newton large programme on SN1006 - II. Thermal emission
Vink, Jacco; Miceli, Marco; Bocchino, Fabrizio +2 more
Based on the XMM-Newton large programme on SN1006 and our newly developed tools for spatially resolved spectroscopy analysis as described in Li et al. (Paper I), we study the thermal emission from interstellar medium (ISM) and ejecta of SN1006 by analysing the spectra extracted from 583 tessellated regions dominated by thermal emission. With some …
Distribution of star formation rates during the rapid assembly of NGC 1399 as deduced from its globular cluster system
Hilker, M.; Pflamm-Altenburg, J.; Kroupa, P. +1 more
Ultra-compact dwarf galaxies (UCDs) share many properties with globular clusters (GCs) and are found in similar environments. Here, a large sample of UCDs and GCs around NGC 1399, the central giant elliptical of the Fornax galaxy cluster, is used to infer their formation history and also to shed light on the formation of NGC 1399 itself. We assume…
Particle-in-cell modeling of spacecraft-plasma interaction effects on double-probe electric field measurements
Miyake, Y.; Usui, H.
The double-probe technique, commonly used for electric field measurements in magnetospheric plasmas, is susceptible to environmental perturbations caused by spacecraft-plasma interactions. To better model the interactions, we have extended the existing particle-in-cell simulation technique so that it accepts very small spacecraft structures, such …
Rayed craters on Dione: Implication for the dominant surface alteration process
Hirata, Naoyuki; Miyamoto, Hideaki
From recently-acquired, high-resolution images obtained by the Cassini spacecraft, we examine the patterns and spatial distributions of rayed craters on Dione. We identify 29 rayed craters with diameters larger than 2 km on Dione's surface. The density of rayed craters and theoretical cratering rates indicate that the retention time for rays on Di…
A Deep Search for Additional Satellites around the Dwarf Planet Haumea
Brown, Michael E.; Ragozzine, Darin; Burkhart, Luke D.
Haumea is a dwarf planet with two known satellites, an unusually high spin rate, and a large collisional family, making it one of the most interesting objects in the outer solar system. A fully self-consistent formation scenario responsible for the satellite and family formation is still elusive, but some processes predict the initial formation of…
MHD-IPS analysis of relationship among solar wind density, temperature, and flow speed
Hayashi, Keiji; Tokumaru, Munetoshi; Fujiki, Ken'ichi
The solar wind properties near the Sun are a decisive factor of properties in the rest of heliosphere. As such, determining realistic plasma density and temperature near the Sun is very important in models for solar wind, specifically magnetohydrodynamics (MHD) models. We had developed a tomographic analysis to reconstruct three-dimensional solar …
XMMSL1J063045.9-603110: a tidal disruption event fallen into the back burner
Campana, Sergio; Mainetti, Deborah; Colpi, Monica
Black holes at the centre of quiescent galaxies can be switched on when they accrete gas that is gained from stellar tidal disruptions. A star approaching a black hole on a low angular momentum orbit may be ripped apart by tidal forces, which triggers raining down of a fraction of stellar debris onto the compact object through an accretion disc an…
A dispersive wave pattern on Jupiter's fastest retrograde jet at 20°S
Fletcher, L. N.; Orton, G. S.; Rogers, J. H. +3 more
A compact wave pattern has been identified on Jupiter's fastest retrograding jet at 20°S (the SEBs) on the southern edge of the South Equatorial Belt. The wave has been identified in both reflected sunlight from amateur observations between 2010 and 2015, thermal infrared imaging from the Very Large Telescope and near infrared imaging from the Inf…
Relationship between Distribution of Magnetic Decay Index and Filament Eruptions
Liu, Y.; Li, H.; Elmhamdi, A. +1 more
The decay index n of a horizontal magnetic field is considered to be an important parameter in judging the stability of a flux rope. However, the spatial distribution of this parameter has not been extensively explored so far. In this paper, we present a delineative study of the three-dimensional maps of n for two eruptive events, in which filamen…
Triple-ionized carbon associated with the low-density neutral hydrogen gas at 1.7 < z < 3.3: the integrated N H I-N C IV relation
Cristiani, S.; Carswell, R. F.; Kim, T. -S. +4 more
From the Voigt profile fitting analysis of 183 intervening {C IV} systems at 1.7 < z < 3.3 in 23 high-quality UVES/VLT and HIRES/Keck QSO spectra, we find that a majority of {C IV} systems (∼75 per cent) display a well-characterized scaling relation between integrated column densities of {H I} and {C IV} with a negligible redshift evolution,…