Search Publications
Two years of solar wind and pickup ion measurements at comet 67P/Churyumov-Gerasimenko
Glassmeier, K. -H.; Nilsson, H.; Eriksson, A. +8 more
The Ion and Electron Sensor (IES) as well as other members of the Rosetta Plasma Consortium (RPC) on board the Rosetta spacecraft (S/C) measured the characteristics of the solar wind almost continuously since its arrival at 67P/Churyumov-Gerasimenko (CG) in 2014 August. An important process at a comet is the so-called pickup process in which a new…
An eLIMA model for the 67 s X-ray periodicity in CAL 83
Meintjes, P. J.; Odendaal, A.
Supersoft X-ray sources (SSSs) are characterized by their low effective temperatures and high X-ray luminosities. The soft X-ray emission can be explained by hydrogen nuclear burning on the surface of a white dwarf (WD) accreting at an extremely high rate. A peculiar ∼67 s periodicity (P67) was previously discovered in the XMM-Newton li…
Changes in the Martian atmosphere induced by auroral electron precipitation
Gérard, J. -C.; Hubert, B.; Shematovich, V. I. +1 more
Typical auroral events in the Martian atmosphere, such as discrete and diffuse auroral emissions detected by UV spectrometers onboard ESA Mars Express and NASA MAVEN, are investigated. Auroral electron kinetic energy distribution functions and energy spectra of the upward and downward electron fluxes are obtained by electron transport calculations…
Strong Lensing Analysis of the Galaxy Cluster MACS J1319.9+7003 and the Discovery of a Shell Galaxy
Zitrin, Adi
We present a strong-lensing (SL) analysis of the galaxy cluster MACS J1319.9+7003 (z = 0.33, also known as Abell 1722), as part of our ongoing effort to analyze massive clusters with archival Hubble Space Telescope (HST) imaging. We spectroscopically measured with Keck/Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) two galaxies mult…
Young star clusters in circumnuclear starburst rings
Ho, Luis C.; de Grijs, Richard; Anders, Peter +2 more
We analyse the cluster luminosity functions (CLFs) of the youngest star clusters in two galaxies exhibiting prominent circumnuclear starburst rings. We focus specifically on NGC 1512 and NGC 6951, for which we have access to Hα data that allow us to unambiguously identify the youngest sample clusters. To place our results on a firm statistical foo…
Reanalysis of high-resolution XMM-Newton data of V2491 Cygni using models of collisionally ionized hot absorbers
Balman, Ş.; Gamsızkan, Ç.
Aims: We model spectral absorption features in data of the high-resolution XMM-Newton Reflection Grating Spectrometer.
Methods: We performed X-ray spectral analysis and modeling using the SRON software SPEX version 2.05.04.
Results: We present a reanalysis of data obtained with the XMM-Newton Reflection Grating Spectrometer of the c…
Validation of Spherical Born Approximation Sensitivity Functions for Measuring Deep Solar Meridional Flow
Roth, Markus; Jackiewicz, Jason; Kholikov, Shukur +1 more
Accurate measurements of deep solar meridional flow are of vital interest for understanding the solar dynamo. In this paper, we validate a recently developed method for obtaining sensitivity functions (kernels) for travel-time measurements to solar interior flows using the Born approximation in spherical geometry, which is expected to be more accu…
A study of ionopause perturbation and associated boundary wave formation at Venus
Zhang, Tielong; Collinson, Glyn A.; Chong, Ghai Siung +3 more
Magnetometer and electron spectrometer data from Venus Express (VEX) are used to investigate the occurrence of boundary wave phenomenon occurring in the vicinity of the Venusian terminator. On 26 June 2006, VEX data show the ionosphere to be unmagnetized (≈0 nT), a common observation usually expected during solar maximum. This results in the respe…
Deconstructing a galaxy: colour distributions of point sources in Messier 83
Barmby, P.; Kiar, A. K.; Hidalgo, A.
What do we see when we look at a nearby, well-resolved galaxy? Thousands of individual sources are detected in multiband imaging observations of even a fraction of a nearby galaxy, and characterizing those sources is a complex process. This work analyses a ten-band photometric catalogue of nearly 70 000 point sources in a 7.3 square arcmin region …
Supernova remnants in the Magellanic Clouds
Bozzetto, L. M.; Filipovic, M. D.
We present initial results of an ongoing study of the supernova remnants (SNRs) and candidates in the Magellanic Clouds. Some 108 objects in both Clouds are considered to be either an SNR or a reliable candidate. This represents the most complete sample of known SNRs in any galaxy. therefore, this study allows us to study SNR population properties…