Search Publications
Population of persistent high-mass X-ray binaries in the Milky Way
Tsygankov, S. S.; Lutovinov, A. A.; Revnivtsev, M. G. +1 more
We present results of the study of persistent high-mass X-ray binaries (HMXBs) in the Milky Way, obtained from the deep INTEGRAL Galactic plane survey. This survey provides us a new insight into the population of HMXBs because almost half of the whole sample consists of sources discovered with INTEGRAL. It is demonstrated for the first time that t…
Hydrovolcanic tuff rings and cones as indicators for phreatomagmatic explosive eruptions on Mars
Hauber, E.; Brož, P.
is a common natural phenomenon on Earth and should be common on Mars, too, since its surface shows widespread evidence for volcanism and near-surface water. We investigate fields of pitted cones in the Nephentes/Amenthes region at the southern margin of the ancient impact basin, Utopia, which were previously interpreted as mud volcanoes. The cone …
Collisionless Damping at Electron Scales in Solar Wind Turbulence
Howes, G. G.; TenBarge, J. M.; Dorland, W.
The dissipation of turbulence in the weakly collisional solar wind plasma is governed by unknown kinetic mechanisms. Two candidates have been suggested to play an important role in the dissipation, collisionless damping via wave-particle interactions and dissipation in small-scale current sheets. High resolution spacecraft measurements of the turb…
Properties of Polycyclic Aromatic Hydrocarbons in the Northwest Photon Dominated Region of NGC 7023. I. PAH Size, Charge, Composition, and Structure Distribution
Boersma, C.; Bregman, J. D.; Allamandola, L. J.
Polycyclic aromatic hydrocarbon (PAH) emission in the Spitzer Infrared Spectrograph spectral map of the northwest photon dominated region (PDR) in NGC 7023 was analyzed exclusively using PAH spectra from the NASA Ames PAH IR Spectroscopic Database (www.astrochem.org/pahdb). The 5-15 µm spectrum at each pixel is fitted using a non-negative-le…
Quantitative Assessments of the Martian Hydrosphere
Mangold, Nicolas; Mousis, Olivier; Hauber, Ernst +6 more
In this paper, we review current estimates of the global water inventory of Mars, potential loss mechanisms, the thermophysical characteristics of the different reservoirs that water may be currently stored in, and assess how the planet's hydrosphere and cryosphere evolved with time. First, we summarize the water inventory quantified from geologic…
The importance of amplitude modulation in nonlinear interactions between electrons and large amplitude whistler waves
Li, W.; Tao, X.; Bortnik, J. +2 more
The effects of amplitude modulation on nonlinear interactions between a parallel propagating whistler wave and electrons in a dipole field are investigated in this work using a test particle code. Here we first use the test particle simulation to validate a previous single-wave nonlinear theory. Then we adopt a simple two-wave model to represent t…
ALMA Observations of the HH 46/47 Molecular Outflow
Garay, Guido; Mardones, Diego; Noriega-Crespo, Alberto +3 more
The morphology, kinematics, and entrainment mechanism of the HH 46/47 molecular outflow were studied using new ALMA Cycle 0 observations. Results show that the blue and red lobes are strikingly different. We argue that these differences are partly due to contrasting ambient densities that result in different wind components having a distinct effec…
A low-mass cut-off near the hydrogen burning limit for Salpeter-like initial mass functions in early-type galaxies
Treu, Tommaso; Czoske, Oliver; Koopmans, Léon V. E. +3 more
We conduct a detailed investigation of the properties of the stellar initial mass function (IMF) in two massive early-type lens galaxies with velocity dispersions of σ ≃ 245 and 325 km s-1, for which both Hubble Space Telescope imaging and X-Shooter spectra are available. We compare the inferences obtained from two fully independent met…
On timing and spectral characteristics of the X-ray pulsar 4U 0115+63: Evolution of the pulsation period and the cyclotron line energy
Tsygankov, S. S.; Lutovinov, A. A.; Boldin, P. A.
An overview of the results of observations for the transient X-ray pulsar 4U 0115+63, amember of a binary system with a Be star, since its discovery to the present day (∼40 years) based on data from more than dozen observatories and instruments is presented. An overall light curve and the history of change in the spin frequency of the neutron star…
Multispectral simultaneous diagnosis of Saturn's aurorae throughout a planetary rotation
Lamy, L.; Badman, S. V.; Brandt, P. C. +6 more
From 27 to 28 January 2009, the Cassini spacecraft remotely acquired combined observations of Saturn's southern aurorae at radio, ultraviolet, and infrared wavelengths, while monitoring ion injections in the middle magnetosphere from energetic neutral atoms. Simultaneous measurements included the sampling of a full planetary rotation, a relevant t…