Search Publications
Nonlinear propagation of kinetic Alfvén wave and turbulent spectrum in reconnection region of magnetotail
Sharma, R. P.; Yadav, Nitin; Sharma, Prachi +2 more
Kinetic Alfvén waves (KAWs) are known to play an important role in magnetic reconnection as well as in turbulence. In the present work, we have derived the dynamical equation of KAWs propagating through Harris sheet. It is assumed that background density gets modified due to nonlinearity and background field gets modified due to the presence of Ha…
Interferometry imaging technique for accurate deep-space probe positioning
Zhang, Juan; Shu, Fengchun; Liu, Lei +2 more
Very long baseline interferometry (VLBI) is a radio astronomy tool with very high spatial resolution. It uses two or more radio telescopes to track the faraway object and gets its visibility. The intensity distribution image of radio source can be obtained by the inverse Fourier transformation of the visibilities sampled on UV plane perpendicular …
ASCA and XMM-Newton Observations of the Galactic Supernova Remnant G311.5-0.3
Filipović, M. D.; Maxted, N.; Wong, G. F. +4 more
We present an analysis of X-ray observations made with ASCA and XMM-Newton of the Galactic supernova remnant (SNR) G311.5-0.3. Prior infrared and radio observations of this SNR have revealed a shell-like morphology at both wavelengths. The spectral index of the radio emission is consistent with synchrotron emission, while the infrared colors are c…
A Jet Source of Event Horizon Telescope Correlated Flux in M87
Punsly, Brian
Event Horizon Telescope (EHT) observations at 230 GHz are combined with Very Long Baseline Interferometry (VLBI) observations at 86 GHz and high-resolution Hubble Space Telescope optical observations in order to constrain the broadband spectrum of the emission from the base of the jet in M87. The recent VLBI observations of Hada et al. provide muc…
Spatial distribution of impact craters on Deimos
Hirata, Naoyuki
Deimos, one of the Martian moons, has numerous impact craters. However, it is unclear whether crater saturation has been reached on this satellite. To address this issue, we apply a statistical test known as nearest-neighbor analysis to analyze the crater distribution of Deimos. When a planetary surface such as the Moon is saturated with impact cr…
XMM-Newton imaging of V1818 Orionis: a young stellar group on the eastern edge of the κ Ori ring
Megeath, S. T.; Pillitteri, I.; Wolk, S. J.
We present the results of a 40 ks XMM-Newton observation centered on the variable star V1818 Ori. Using a combination of the XMM-Newton and AllWISE catalog data, we identify a group of about 31 young stellar objects (YSOs) around V1818 Ori. This group is coincident with the eastern edge of the dust ring surrounding κ Ori. Previously, we concluded …
Science with hot astrophysical plasmas
Urdampilleta, I.; Kaastra, J. S.; Mernier, F. +5 more
We present some recent highlights and prospects for the study of hot astrophysical plasmas. Hot plasmas can be studied primarily through their X-ray emission and absorption. Most astrophysical objects, from solar system objects to the largest scale structures of the Universe, contain hot gas. In general we can distinguish collisionally ionised gas…
Strong Gravitational Lenses and Multi-Wavelength Galaxy Surveys with Akari, Herschel, SPICA and EUCLID
Serjeant, Stephen
Submillimetre and millimetre-wave surveys with Herschel and the South Pole Telescope have revolutionised the discovery of strong gravitational lenses. Their follow-ups have been greatly facilitated by the multi-wavelength supplementary data in the survey fields. The forthcoming Euclid optical/near-infrared space telescope will also detect strong g…
Double-peaked core field of flux ropes during magnetic reconnection
Feng, Xueshang; Nakamura, Rumi; Wang, Rongsheng +2 more
A flux rope event observed in the magnetotail exhibits a double-peaked core field feature. The generation of such double-peaked feature within the flux rope is explored with Hall-MHD simulations and theoretical analysis based on multiple X line reconnection. Simulations with a guide field produce flux ropes bounded by two active X lines in the thi…
How Particles in the Martian Atmosphere Influence the Thermal Protection Structure of the Descent Module EXOMARS-2
Golomazov, M. M.; Ivankov, A. A.
Methods for calculating heat and erosion impact caused by particles in the Martian atmosphere on the heat protection of the descent module EXOMARS-2 during descent in the atmosphere are presented. Atmosphere models corresponding to climatic conditions when landing on the Martian surface are investigated for the landing site Oxita Planum.