Search Publications
Rosetta Lander—After seven years of cruise, prepared for hibernation
Ulamec, Stephan; Biele, Jens; Geurts, Koen +10 more
Rosetta is a Cornerstone Mission of the ESA Horizon 2000 programme. It is going to rendezvous with comet 67P/Churyumov-Gerasimenko after a 10 year cruise and will study both its nucleus and coma with an orbiting spacecraft and a landed platform. The latter, named Philae, has been designed to land softly on the comet nucleus and is equipped with 10…
Unusual Carbonaceous Dust Distribution in PN G095.2+00.7
Onaka, Takashi; Matsuura, Mikako; Sakon, Itsuki +5 more
We investigate the polycyclic aromatic hydrocarbon (PAH) features in the young Galactic planetary nebula PN G095.2+00.7 based on mid-infrared observations. The near- to mid-infrared spectra obtained with the AKARI/IRC and the Spitzer/IRS show the PAH features as well as the broad emission feature at 12 µm usually seen in proto-planetary nebu…
Low-frequency radio spectrum of LS 5039 during periastron and apastron passages
Bhattacharyya, Subir; Bhatt, Nilay; Choudhury, Manojendu +2 more
We have recently studied LS 5039, a gamma-ray binary, with the Giant Metrewave Radio Telescope during its periastron and apastron passage. The results presented here show that the spectra are inverted at low frequency and the flux densities do not differ significantly for two different orbital phases. Assuming that the free-free absorption of radi…
Multiwavelength Observations of Supersonic Plasma Blob Triggered by Reconnection-Generated Velocity Pulse in AR10808
Srivastava, A. K.; Murawski, K.; Erdélyi, R. +1 more
Using multi-wavelength observations of Solar and Heliospheric Observatory (SoHO)/Michelson Doppler Imager (MDI), Transition Region and Coronal Explorer (TRACE, 171 Å), and Hα from Culgoora Solar Observatory at Narrabri, Australia, we present a unique observational signature of a propagating supersonic plasma blob before an M6.2-class solar flare i…
Deformation of plasma bubbles and the associated field aligned current system during substorm recovery phase
Deng, X. H.; Huang, S. Y.; Zhou, M. +2 more
Multiple plasma bubbles have been detected by CLUSTER satellites on August 15th 2001 in midtail (∼-18 Re). Those bubbles can be classified into two types. Type-I bubbles are similar to those bubbles in previous studies [ Sergeev et al., 1996; Walsh et al., 2009]. Unlike type-I bubbles, the trailing parts/tails of type-II bubbles are much more dyna…
A relation between circumnuclear H I, dust, and optical cores in low-power radio galaxies
Morganti, R.; Oosterloo, T.; van Moorsel, G. +1 more
From new observations and literature data we investigate the presence of H I, dust, and optical cores in the central kiloparsec of low-power radio galaxies. The goal of this pilot study is to identify physical relations between these components, which can help us to study kinematics and feeding mechanisms in future samples of active galaxies. Our …
Ring-shaped velocity distribution functions in energy-dispersed structures formed at the boundaries of a proton stream injected into a transverse magnetic field: Test-kinetic results
Voitcu, Gabriel; Echim, Marius M.
In this paper, we discuss the formation of ring-shaped and gyro-phase restricted velocity distribution functions (VDFs) at the edges of a cloud of protons injected into non-uniform distributions of the electromagnetic field. The velocity distribution function is reconstructed using the forward test-kinetic method. We consider two profiles of the e…
Thermal convection in the porous methane-soaked regolith in Titan: Finite amplitude convection
Czechowski, Leszek; Kossacki, Konrad J.
Titan is the only body, beside the Earth, where liquid is present on the surface. This paper is aimed to show the properties of possible convection in a porous regolith on Titan. In our previous work (Czechowski, L., Kossacki, K.J. [2009]. Icarus 202, 599-607) we showed, that the Rayleigh number Ra can exceed its critical value Rac. Hen…
Anomalous Anisotropic Cross-correlations between WMAP CMB Maps and SDSS Galaxy Distribution and Implications on the Dark Flow Scenario
Chen, Xuelei; Zhang, Pengjie; Li, Zhigang
We search for the dark flow induced diffuse kinetic Sunyaev-Zel'dovich (kSZ) effect through CMB-galaxy cross-correlation. Such angular correlation is anisotropic, with a unique cos (θDF) angular dependence, and hence can be distinguished from other components. Here, θDF is the angle between the opposite dark flow direction an…
A critical analysis of three near-infrared photometric methods of estimating distances to cataclysmic variables
Gariety, Michael J.; Ringwald, F. A.
A critical analysis of three methods of estimating distances to cataclysmic variables (CVs) is performed. These methods, by Ak et al., Beuermann, and Knigge, all use near-infrared ( JHK or Ks) magnitudes and the Barnes-Evans relation. We compare all three methods to distances measured by trigonometric parallax by Thorstensen, with Hubbl…