Search Publications
The Creation of Outflowing Plasma in the Corona at Emerging Flux Regions: Comparing Observations and Simulations
van Driel-Gesztelyi, L.; Harra, L. K.; Hood, A. W. +3 more
In this paper we analyse the flux emergence that occurred in the following polarity area of an active region on 1 - 2 December 2006. Observations have revealed the existence of fast outflows at the edge of the emerging flux region. We have performed 3-D numerical simulations to study the mechanisms responsible for these flows. The results indicate…
One Thousand and One Clusters: Measuring the Bulk Flow with the Planck ESZ and X-Ray-selected Galaxy Cluster Catalogs
Hajian, Amir; Mody, Krishnan
We present our measurement of the "bulk flow" using the kinetic Sunyaev-Zel'dovich (kSZ) effect in the Wilkinson Microwave Anisotropy Probe (WMAP) seven-year data. As the tracer of peculiar velocities, we use Planck Early Sunyaev-Zel'dovich Detected Cluster Catalog and a compilation of X-ray-detected galaxy cluster catalogs based on ROSAT All-Sky …
Star Formation and Young Population of the H II Complex Sh2-294
Samal, M. R.; Ojha, D. K.; Pandey, A. K. +3 more
The Sh2-294 H II region ionized by a single B0V star features several infrared excess sources, a photodissociation region, and also a group of reddened stars at its border. The star formation scenario in this region seems to be quite complex. In this paper, we present follow-up results of Sh2-294 H II region at 3.6, 4.5, 5.8, and 8.0 µm obse…
A Companion as the Cause of Latitude-dependent Effects in the Wind of Eta Carinae
Madura, T. I.; Hillier, D. J.; Weigelt, G. +2 more
We analyze spatially resolved spectroscopic observations of the Eta Carinae binary system obtained with the Hubble Space Telescope/STIS. Eta Car is enshrouded by the dusty Homunculus nebula, which scatters light emitted by the central binary and provides a unique opportunity to study a massive binary system from different vantage points. We invest…
A case study of proton precipitation at Mars: Mars Express observations and hybrid simulations
Kallio, E.; Fedorov, A.; Barabash, S. +8 more
Using the data from the Analyzer of Space Plasma and Energetic Atoms (ASPERA-3) experiment on board Mars Express and hybrid simulations, we have investigated the entry of protons into the Martian induced magnetosphere. We discuss one orbit on the dayside with observations of significant proton fluxes at altitudes down to 260 km on 27 February 2004…
Sunlight refraction in the mesosphere of Venus during the transit on June 8th, 2004
Rondi, S.; Sütterlin, P.; Tanga, P. +6 more
Many observers in the past gave detailed descriptions of the telescopic aspect of Venus during its extremely rare transits across the Solar disk. In particular, at the ingress and egress, the portion of the planet’s disk outside the Solar photosphere has been repeatedly perceived as outlined by a thin, bright arc (“aureole”). Those historical visu…
XMM-Newton view of the N 206 superbubble in the Large Magellanic Cloud
Kavanagh, P. J.; Sasaki, M.; Points, S. D.
Aims: We perform an analysis of the X-ray superbubble in the N 206 H ii region in the Large Magellanic Cloud using current generation facilities to gain a better understanding of the physical processes at work in the superbubble and to improve our knowledge of superbubble evolution.
Methods: We used XMM-Newton observations of the N 206 r…
Multi-frequency observations of SNR J0453-6829 in the LMC. A composite supernova remnant with a pulsar wind nebula
Pietsch, W.; Haberl, F.; Filipović, M. D. +7 more
Context. The Large Magellanic Cloud (LMC) is rich in supernova remnants (SNRs), which can be investigated in detail with radio, optical, and X-ray observations. SNR J0453-6829 is an X-ray and radio-bright remnant in the LMC, within which previous studies revealed the presence of a pulsar wind nebula (PWN), making it one of the most interesting SNR…
The O2 nightglow in the martian atmosphere by SPICAM onboard of Mars-Express
Gondet, B.; Reberac, A.; Montmessin, F. +5 more
We present observations of the O2(a1Δg) nightglow at 1.27 µm on Mars using the SPICAM IR spectrometer onboard of the Mars Express orbiter. In contrast to the O2(a1Δg) dayglow that results from the ozone photodissociation, the O2(a1Δg) nightglow…
Overview of Lutetia's surface composition
Sierks, H.; Barucci, M. A.; Fornasier, S. +10 more
All available data regarding compositionally diagnostic measurements of asteroid (21) Lutetia are assembled. We review ground-based observations together with recent spacecraft mission (Rosetta, Herschel and Spitzer) measurements. The aim of this paper is to gather all the pieces of the Lutetia puzzle, in order to derive the most probable surface …