Search Publications
Mass and energy supply of a cool coronal loop near its apex
He, Jiansen; Peter, Hardi; Wang, Linghua +2 more
Context. Different models for the heating of solar corona assume or predict different locations of the energy input: concentrated at the footpoints, at the apex, or uniformly distributed. The brightening of a loop could be due to the increase in electron density ne, the temperature T, or a mixture of both. Aim. We investigate possible r…
Local disc model in view of Gaia DR1 and RAVE data
Steinmetz, M.; Kordopatis, G.; Grebel, E. K. +8 more
Aims: We test the performance of the semi-analytic self-consistent Just-Jahreiß disc model (JJ model) with the astrometric data from the Tycho-Gaia Astrometric Solution (TGAS) sub-catalogue of the first Gaia data release (Gaia DR1), as well as the radial velocities from the fifth data release of the Radial Velocity Experiment survey (RAVE DR5…
Chandra and HST Snapshots of Fossil System Progenitors
White, Raymond E., III; Dupke, Renato A.; Wong, Ka-Wah +2 more
The search for the progenitors to today’s fossil galaxy systems has been restricted to N-body simulations until recently, when 12 fossil progenitors were identified in the CASSOWARY catalog of strong-lensing systems. All 12 systems lie in the predicted redshift range for finding fossils that are in the process of assembling their brightest group g…
Bright compact bulges at intermediate redshifts
Sachdeva, Sonali; Saha, Kanak
Studying bright (MB < -20), intermediate-redshift (0.4 < z< 1.0), disc-dominated (nB < 2.5) galaxies from Hubble Space Telescope/Advanced Camera for Surveys and Wide Field Camera 3 in Chandra Deep Field-South, in rest-frame B and I band, we found a new class of bulges that is brighter and more compact than ellipti…
Space weather at planet Venus during the forthcoming BepiColombo flybys
Odstrcil, D.; McKenna-Lawlor, S.; Jackson, B.
The BepiColombo (BC) Mission which will be launched in 2018, will include during its Cruise Phase two flybys of Venus and five Mercury flybys. It will then enter a one Earth year orbit about Mercury (with a possible one-year extension) during which two spacecraft, one provided by ESA (MPO) and one provided by JAXA (MMO), will perform both autonomo…
Volcanic flows versus water- and ice-related outburst deposits in eastern Hellas: A comparison
Jaumann, R.; Stephan, K.; Hauber, E. +1 more
Hellas Planitia is one of the major topographic sinks on Mars for the deposition of any kind of sediments. We report on our observations of sheet deposits in the eastern part of the basin that are apparently related to the Dao Vallis outflow channel. The deposits have lobate flow fronts and a thickness of a few decameters. Despite their generally …
Periodic self-reformation of rippled perpendicular collisionless shocks in two dimensions
Umeda, Takayuki; Daicho, Yuki
Large-scale two-dimensional (2-D) full particle-in-cell (PIC) simulations are carried out for studying periodic self-reformation of a supercritical collisionless perpendicular shock with an Alfvén-Mach number MA∼6.
Previous self-consistent one-dimensional (1-D) hybrid and full PIC simulations have demonstrated that the periodic ref…Rapid Flaring in the Galactic-plane Gamma-Ray Transient Fermi J0035+6131
Kaaret, Philip; Pandel, Dirk
We investigate the gamma-ray and X-ray emission from the transient gamma-ray source Fermi J0035+6131, which was discovered with the Fermi Large Area Telescope (LAT) near the Galactic plane at b = 1.°3, and we discuss potential multi-wavelength counterparts of the gamma-ray source. Our analysis of over 9 years of Fermi LAT data revealed two flaring…
Magnetic Lasso: A New Kinematic Solar Wind Propagation Method. Magnetic Lasso Propagation
Dósa, M.; Opitz, A.; Dálya, Z. +1 more
Solar wind propagation from the point of measurement to an arbitrary target in the heliosphere is an important input for heliospheric, planetary and cometary studies. In this paper a new kinematic propagation method, the magnetic lasso method is presented. Compared to the simple ballistic approach our method is based on reconstructing the ideal Pa…
Dust Impact Monitor (SESAME-DIM) on-board Rosetta/Philae: Aerogel as comet analog material
Flandes, Alberto; Krüger, Harald; Loose, Alexander +8 more
On 12 November 2014, during the descent of the Rosetta lander Philae to the surface of comet 67P/Churyumov-Gerasimenko the Dust Impact Monitor (DIM) on board Philae recorded an impact of a cometary dust impact of a cometary dust particle at 2.4 km from the comet surface (5 km from the nucleus' barycentre). In this work, we report further experimen…