Search Publications
Large-scale quasi-two-dimensional turbulence and a inverse spectral flux of energy in the atmosphere of Venus
Izakov, M. N.
The comparison of the theoretical inferences and the experimental data on large-scale turbulence in the atmospheres of the Earth and Venus, including those acquired with the Venus Express spacecraft, allows us to conclude that there is a inverse spectral flux of energy in the atmosphere of Venus, as in the terrestrial atmosphere, which participate…
Observations and Orbital Analysis of the High-Amplitude Delta Scuti Star SZLyncis: The Unusual Orbital Precession
Li, Lin-Jia; Qian, Sheng-Bang
We determined forty-two new times of light maximum from our photometry observations and WASP project, and collected all times of light maximum observed between 1961 and 2013 in order to calculate the orbital elements of the SZ Lyncis system and the secular change of the pulsation period with the classical O - C method. We confirmed the decrease of…
Radio Sources Embedded in the Dense Core B59, the ``Mouthpiece'' of the Pipe Nebula
Loinard, L.; Rodríguez, L. F.; Dzib, S. A. +1 more
We present Very Large Array continuum observations made at 8.3 GHz toward the dense core B59, in the Pipe Nebula. We detect six compact sources, of which five are associated with the five most luminous sources at 70 µm in the region, while the remaining one is probably a background source. We propose that the radio emission is free-free from…
Variation of Emission Line Width in Mid- and High-Latitude Corona
Banerjee, D.; Krishna Prasad, S.; Singh, Jagdev
Spectroscopic studies of the solar corona, using the high spatial and spectral resolution 25-cm coronagraph at the Norikura Solar Observatory for equatorial off-limb observations, indicated that the variation of radiance and line width with height is different for different temperature lines. The line width of the forbidden red emission line [Fe x…
Comet 67P/CG: Influence of the sublimation coefficient on the temperature and outgassing
Markiewicz, Wojciech J.; Kossacki, Konrad J.
The sublimation rate of ice is commonly calculated using simple Hertz-Knudsen formula. This formula is derived from the kinetic theory of gases and ignores microphysical processes determining the actual sublimation rate. The microphysical processes can be accounted for by including in the Herz-Knudsen equation a temperature dependent sublimation c…
Second outburst of the black hole candidate MAXI J1836-194 from SWIFT and INTEGRAL observations
Sunyaev, R. A.; Grebenev, S. A.; Prosvetov, A. V.
Details of the observations of a new (second) outburst of the X-ray transientMAXI J1836-194 discovered late in August 2011, a suspected black hole in a low-mass binary system, with the instruments of the SWIFT and INTEGRAL orbiting observatories are presented. The outburst was weaker than the first one; the source had a power-law spectrum in a wid…
Electric Current Equilibrium in the Corona
Filippov, Boris
A hyperbolic flux-tube configuration containing a null point below the flux rope is considered as a pre-eruptive state of coronal mass ejections that start simultaneously with flares. We demonstrate that this configuration is unstable and cannot exist for a long time in the solar corona. The inference follows from general equilibrium conditions an…
Herschel and IRAM-30 m observations of comet C/2012 S1 (ISON) at 4.5 AU from the Sun
Altieri, B.; Jorda, L.; Küppers, M. +9 more
Context. The sungrazer comet C/2012 S1 (ISON) (perihelion at rh = 0.0125 AU from the Sun) was bright and active when discovered in September 2012 at 6.3 AU from the Sun.
Aims: Our goal was to characterize the distant gaseous and dust activity of this comet, inbound, from observations of H2O, CO and the dust coma in the f…
Do gravitational lens galaxies have an excess of luminous substructure?
Treu, T.; Nierenberg, A. M.; Oldenburg, D.
Strong gravitational lensing can be used to directly measure the mass function of their satellites, thus testing one of the fundamental predictions of cold dark matter cosmological models. Given the importance of this test, it is essential to ensure that galaxies acting as strong lenses have dark and luminous satellites which are representative of…
X-ray observations of the merging cluster CIZA J2242.8+5301
Simionescu, A.; Croston, J. H.; van Weeren, R. J. +4 more
Multiwavelength studies of radio relics at merger shocks set powerful constraints on the relics origin and formation mechanism. However, for X-ray observations, a main difficulty is represented by the low X-ray surface brightness far out in the cluster outskirts, where relics are typically found. Here, we present XMM-Newton results from a 130-ks o…