Search Publications

Mode identification of terrestrial ULF waves observed by Cluster: A case study

Nilsson, H.; Walker, S. N.; Dunlop, M. +4 more

Using multipoint measurements from the Cluster mission wave identification techniques are applied to observations of ULF waves made in the terrestrial foreshock with the aim of identifying the modes and properties of the waves taking into account the effects of a high beta plasma. The wave properties in the spacecraft and plasma rest frames are ex…

INTEGRAL serendipitous detection of the gamma-ray microquasar LS 5039

Goldoni, P.; Di Salvo, T.; Rupen, M. +3 more

LS 5039 is the only X-ray binary persistently detected at TeV energies by the Cherenkov HESS telescope. It is moreover a γ-ray emitter in the GeV and possibly MeV energy ranges. To understand important aspects of jet physics, like the magnetic field content or particle acceleration, and emission processes, such as synchrotron and inverse Compton (…

Measuring the stress state of the Saturnian magnetosphere

Russell, C. T.; Dougherty, M. K.; Khurana, K. K. +1 more

The dynamics of a planetary magnetosphere can be quantified by subtracting the system's ``ground'' state from the observed state and tracking their difference. When a magnetosphere is stressed, by external and internal forces, the magnetic field lines become stretched or compressed. In this paper, we construct an index of the stress state of the S…

The baryon density at z = 0.9-1.9. Tracing the warm-hot intergalactic medium with broad Lyman α absorption

Reimers, D.; Janknecht, E.; Prause, N. +1 more

Aims:We present an analysis of the Lyman α forests of five quasar spectra in the near UV. Properties of the intergalactic medium (IGM) at an intermediate redshift interval (0.9≤ z≤1.9) are studied. The amount of baryons in the diffuse photoionised IGM and the warm-hot intergalactic medium (WHIM) are traced to get constraints on the redshift evolut…

High energy activity of the super-massive black hole at the Galactic Center

Goldwurm, Andrea

The center of our galaxy hosts the nearest super-massive black hole to the solar system, identified with the compact radio source Sgr A ^*. High energy experiments have tried in the past to detect the X/gamma-ray emission expected from the accretion of the surrounding material into this super-massive black hole. Only recently, however, t…

Examining the wake structure in Saturn's rings from microwave observations over varying ring opening angles and wavelengths

de Pater, Imke; Molnar, Lawrence A.; Dunn, David E.

Over the last 15 to 20 years several high quality, high resolution data have been taken with the very large array (VLA). These data exhibit a wide range of ring opening angles ( |B|=0 to 26°) and wavelengths ( λ=0.7 to 20 cm). At these wavelengths the primary flux from the rings is scattered saturnian thermal emission, with a small contribution co…

Theoretical planetary mass spectra - a prediction for COROT

Broeg, C.

The satellite COROT will search for close-in exoplanets around a few thousand stars using the transit search method. The COROT mission holds the promise of detecting numerous exoplanets. Together with radial velocity follow-up observations, the masses of the detected planets will be known.

We have devised a method for predicting the expected …

Evidence for the Evolution of Young Early-Type Galaxies in the GOODS/CDF-S Field

Mobasher, Bahram; Goudfrooij, Paul; Puzia, Thomas H.

We have developed an efficient photometric technique for identifying young early-type galaxy candidates using a combination of photometric redshifts, spectral-type classification, and optical/near-infrared colors. Applying our technique to the GOODS HST ACS and VLT ISAAC data, we have selected a complete and homogeneous sample of young elliptical …

Towards self-consistent models of isolated neutron stars: The case of the X-ray pulsar RX J0720-3125

Miniutti, G.; Pons, J. A.; Pérez-Azorín, J. F. +1 more

We propose a self–consistent model to explain all observational properties reported so far on the isolated neutron star (INS) RX J0720-3125 with the aim of giving a step forward towards our understanding of INSs. For a given magnetic field structure, which is mostly confined to the crust and outer layers, we obtain theoretical models and spectra w…

A catalogue of absorption lines in eight Hubble Space Telescope/STIS E230M 1.0 < z < 1.7 quasar spectra

Misawa, T.; Charlton, J. C.; Masiero, J. R. +6 more

We have produced a catalogue of line identifications and equivalent width measurements for all absorption features in eight ultraviolet echelle quasar spectra. These spectra were selected as having the highest signal-to-noise ratio among the Hubble Space Telescope/STIS spectra obtained with the E230M grating. We identify 56 metal-line systems towa…