Search Publications
A finite difference time domain model for the Titan ionosphere Schumann resonances
Navarro, E. A.; Soriano, A.; Morente, J. A. +1 more
This paper presents a numerical approach to model the electrical properties of Titan's atmosphere. The finite difference time domain technique is applied to model the atmosphere of Saturn's satellite in order to determine Schumann resonant frequencies and electromagnetic field distributions at the extremely low frequency range. Spherical coordinat…
The latitudinal distributions of sunspot areas and magnetic fields and their correlation with the background solar magnetic field in the cycle 23
Zharkova, V. V.; Zharkov, S. I.; Gavryuseva, E. V.
The quasi 3D latitudinal distributions (butterfly diagrams) of sunspot areas and magnetic fields obtained within the whole µ-hemispheres in longitudes from the Solar Feature Catalogues for 9 years (1996-2005) of the cycle 23 are correlated with those of the low-resolution solar magnetic fields (SMF) obtained from Wilcox Solar Observatory. Du…
A Possible Dearth of Hot Gas in Galaxy Groups at Intermediate Redshift
Paerels, Frits; Spiegel, David S.; Scharf, Caleb A.
We examine the X-ray luminosity of galaxy groups in the CNOC2 survey at redshifts 0.1<z<0.6. Previous work examining the gravitational lensing signal of the CNOC2 groups has shown that they are likely to be genuine, gravitationally bound objects. Of the 21 groups in the field of view of the EPIC pn camera on XMM-Newton, not one was visible i…
Cosmic GRB 060428C detected in the field of view of the IBIS and SPI telescopes onboard the INTEGRAL observatory and its early afterglow
Grebenev, S. A.; Chelovekov, I. V.
While analyzing the archival data of the INTEGRAL observatory, we detected and localized a cosmic gamma-ray burst recorded on April 28, 2006, by the IBIS/ISGRI and SPI telescopes in their fields of view. Since the burst was not revealed by the INTEGRAL burst alert system (IBAS), information about its coordinates was not distributed in time and no …
Chandra X-ray counterpart of KS 1741-293
Pérez-Ramírez, D.; Combi, J. A.; Martí, J. +4 more
Aims:We aim to investigate the nature of the high energy source KS 1741-293 by revisiting the radio and infrared associations proposed in the early 1990s.
Methods: Our work is mostly based on the analysis of modern survey and archive data, including the NRAO, MSX, 2MASS and Chandra archives, and catalogues. We also have obtained deep CCD optic…
Influence of aerosol multiple scattering of ultraviolet radiation on martian atmospheric sensing
Zorzano, M. -P.; Córdoba-Jabonero, C.
The ultraviolet (UV) radiative transfer problem in the martian atmosphere is dominated by multiple scattering of photons with the micron-sized aerosols that are suspended in the thin atmosphere. By implementing a multiple stream, vertical fine layering description of the radiative transfer equation that is able to cope with the strong vertical var…
The black-hole candidate XTE J1817-330 as seen by XMM-Newton and INTEGRAL
Haberl, Frank; Greiner, Jochen; Sala, Gloria +1 more
The new black hole candidate XTE J1817-330, discovered on 26 January 2006 with RXTE, was observed with XMM-Newton and INTEGRAL in February and March 2006, respectively. The X-ray spectrum is dominated by the thermal emission of the accretion disk in the soft band, with a low absorption column density (NH=1.77(±0.01)×1021 cm
The luminous infrared composite Seyfert 2 galaxy NGC 7679 through the [O III] λ 5007 emission line
Jockers, K.; Yankulova, I. M.; Golev, V. K.
Context:
OI line emission in cool stars: calculations using partial redistribution
Jordan, C.; Koncewicz, R.
Radiative transfer calculations have been performed for five cool stars: α Tau, β Gem, Procyon, ɛ Eri and the Sun, for the purpose of investigating the behaviour of the OI emission over a wide range of stellar types, and its dependence on coherent photon scattering. These stars span a range of spectral types from F5 IV-V to K5 III and surface grav…
Constraining Electron Acceleration at a Standing Shock with HXR and Radio Observations
Mann, G.; Aurass, H.; Warmuth, A.
The acceleration of electrons to non-thermal energies in solar flares is one of the main unsolved questions in solar physics. One possibility for the production of these energetic electrons is acceleration at the reconnection outflow termination shock (TS). We use radio observations to constrain the characteristics of the TS, and hard X-ray and γ-…