Search Publications
Differences between the impact regimes of the terrestrial planets: Implications for primordial D:H ratios
Mousis, O.; Horner, J.; Petit, J. -M. +1 more
It is often assumed that the terrestrial worlds have experienced identical impact regimes over the course of their formation and evolution, and, as a result, would have started life with identical volatile budgets. In this work, through illustrative dynamical simulations of the impact flux on Venus, the Earth, and Mars, we show that these planets …
A self-consistent empirical model atmosphere, abundance and stratification analysis of the benchmark roAp star α Circini
Shulyak, D.; Ryabchikova, T.; Kochukhov, O.
Context: Chemically peculiar (CP) stars are unique natural laboratories for the investigation of the microscopic diffusion processes of chemical elements. The element segregation under the influence of gravity and radiation pressure leads to the appearance of strong abundance gradients in the atmospheres of CP stars. Consequently, the atmospheric …
Parameters of the Magnetic Flux inside Coronal Holes
Yurchyshyn, Vasyl; Abramenko, Valentyna; Watanabe, Hiroko
The parameters of the magnetic flux distribution inside low-latitude coronal holes (CHs) were analyzed. A statistical study of 44 CHs based on Solar and Heliospheric Observatory (SOHO)/MDI full disk magnetograms and SOHO/EIT 284 Å images showed that the density of the net magnetic flux, Bnet, does not correlate with the associated solar…
The Extreme Star Formation Activity of Arp 299 Revealed by Spitzer IRS Spectral Mapping
Colina, Luis; Rieke, George H.; Alonso-Herrero, Almudena +6 more
We present Spitzer/IRS spectral mapping observations of the luminous infrared galaxy Arp 299 (IC 694 + NGC 3690) covering the central ~45'' ~ 9 kpc. The integrated mid-IR spectrum of Arp 299 is similar to that of local starbursts despite its strongly interacting nature and high-IR luminosity, L IR ~ 6 × 1011 L sun.…
A ionized reflecting skin above the accretion disk of GX 349+2
Robba, N. R.; Papitto, A.; Burderi, L. +4 more
Context: The broad emission features in the Fe-Kα region of X-ray binary spectra represent an invaluable probe to constrain the geometry and the physics of these systems. Several Low Mass X-ray binary systems (LMXBs) containing a neutron star (NS) show broad emission features between 6 and 7 keV and most of them are now interpreted as reflection f…
High energy emission and polarisation limits for the INTEGRAL burst GRB 061122
McGlynn, S.; McBreen, S.; Foley, S. +6 more
Context: GRB 061122 is one of the brightest GRBs detected within INTEGRAL's field of view to date, with a peak flux (20-200 keV) of 32 photons cm-2 s-1 and fluence of 2 × 10-5 erg cm-2. The Spectrometer aboard INTEGRAL, SPI, can measure linear polarisation in bright GRBs through the process of Compton sc…
An X-Ray Face-On View of the Sagittarius B Molecular Clouds Observed with Suzaku
Koyama, Katsuji; Nobukawa, Masayoshi; Tsuru, Takeshi Go +2 more
We present a new methodology to derive the positions of the Sagittarius (Sgr) B molecular clouds (MCs) along the line of sight, as an application study of the Galactic center diffuse X-rays (GCDX). The GCDX are composed of hot plasma emission of about 7keV and 1keV temperatures, and non-thermal continuum emission including the 6.4keV line from neu…
New X-ray detections of Herbig stars
Schmitt, J. H. M. M.; Bouvier, J.; Robrade, J. +1 more
Context: The interpretation of X-ray detections from Herbig Ae/Be stars is disputed as it is not clear whether these intermediate-mass pre-main sequence stars are able to drive a dynamo and ensuing phenomena of magnetic activity. Alternative X-ray production mechanisms, related to stellar winds, star-disk magnetospheres, or unresolved late-type T …
Is cold gas fuelling the radio galaxy NGC 315?
Capetti, A.; Morganti, R.; de Ruiter, H. R. +5 more
We present WSRT, VLA and VLBI observations of the H i absorption in the radio galaxy NGC 315. The main result is that two H i absorbing systems are detected against the central region. In addition to the known highly redshifted, very narrow component, we detect relatively broad (FWZI ~ 150 km s-1) absorption. This broad component is red…
Analysis of Reconstruction Methods for Nonlinear Force-Free Fields
Myshyakov, I. I.; Rudenko, G. V.
We focus on quantitative evaluation of several methods for the reconstruction of force-free magnetic fields in the solar corona. We have studied two topics. The first is to carry out a comparison test of two approaches to implement the optimization method: (1) using a boundary layer with a weighting function and (2) involving an optimization algor…