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The XMM-Newton slew survey in the 2-10 keV band
Read, A. M.; Warwick, R. S.; Saxton, R. D.
Context. The on-going XMM-Newton Slew Survey (XSS) provides coverage of a significant fraction of the sky in a broad X-ray bandpass. Although shallow by contemporary standards, in the "classical" 2-10 keV band of X-ray astronomy, the XSS provides significantly better sensitivity than any currently available all-sky survey.
Aims: We investigat…
Topographic, spectral and thermal inertia analysis of interior layered deposits in Iani Chaos, Mars
Teanby, N. A.; Grindrod, P. M.; Sefton-Nash, E. +2 more
We present an analysis of Interior Layered Deposits (ILDs) in Iani Chaos using visible, infrared, hyperspectral and topographic datasets acquired by instruments aboard NASA’s Mars Global Surveyor, Mars Odyssey, Mars Reconnaissance Orbiter and ESA’s Mars Express spacecraft. We focus on four main regions where ILDs outcrop in Iani Chaos. Deposits sp…
Detection and characterization of a 500 µm dust emissivity excess in the Galactic plane using Herschel/Hi-GAL observations
Bernard, J. -P.; Marshall, D. J.; Paladini, R. +7 more
Context. Past and recent observations have revealed unexpected variations in the far-infrared - millimeter (FIR-mm) dust emissivity in the interstellar medium. In the Herschel spectral range, those are often referred to as a 500 µm emission excess. Several dust emission models have been developed to interpret astrophysical data in the FIR-mm…
The environmental dependence of the structure of outer galactic discs in STAGES spiral galaxies
Bell, Eric F.; Wolf, Christian; Aragón-Salamanca, Alfonso +7 more
We present an analysis of V-band radial surface brightness profiles for spiral galaxies from the field and cluster environments using Hubble Space Telescope/Advanced Camera for Surveys imaging and data from the Space Telescope A901/2 Galaxy Evolution Survey (STAGES). We use a large sample of ∼330 face-on to intermediately inclined spiral galaxies …
Energetic charged particle weathering of Saturn's inner satellites
Krupp, N.; Roussos, E.; Hendrix, A. R. +9 more
We characterize the relative importance of energetic electrons and protons to the weathering of five of the inner satellites of Saturn. To do this, we present data from the Magnetospheric Imaging Instrument on the Cassini spacecraft, some of which is averaged over the whole mission to date. We also compute averaged proton and electron energy spect…
Profile of strong magnetic field By component in magnetotail current sheets
Petrukovich, A. A.; Zhang, T. L.; Lucek, E. +8 more
The strong magnetic field By component (in GSM coordinates) has been increasingly noticed to play an important role in the dynamics of tail current sheet (CS). The distribution profile of strong By components in the tail CS (i.e., those with guide field), however, is not well known. In the present work, by using the simultane…
Water vapor in Titan's stratosphere from Cassini CIRS far-infrared spectra
Lellouch, E.; Irwin, P. G. J.; Teanby, N. A. +12 more
Here we report the measurement of water vapor in Titan's stratosphere using the Cassini Composite Infrared Spectrometer (CIRS, Flasar, F.M. et al. [2004]. Space Sci. Rev. 115, 169-297). CIRS senses water emissions in the far infrared spectral region near 50 µm, which we have modeled using two independent radiative transfer codes (NEMESIS (Ir…
Bar pattern speed evolution over the last 7 Gyr
Aguerri, J. A. L.; Pérez, I.; Méndez-Abreu, J.
Context. The tumbling pattern of a bar is the main parameter characterising its dynamics. From numerical simulations, its evolution since bar formation is tightly linked to the dark halo in which the bar is formed through dynamical friction and angular momentum exchange. Observational measurements of the bar pattern speed with redshift can restric…
Pulsation spectrum of δ Scuti stars: the binary HD 50870 as seen with CoRoT and HARPS
Auvergne, M.; Amado, P. J.; Baudin, F. +14 more
Aims: We present the results obtained with the CoRoT satellite for HD 50870, a δ Sct star which was observed for 114.4 d. The aim of these observations was to evaluate the results obtained for HD 50844, the first δ Sct star monitored with CoRoT, on a longer time baseline.
Methods: The 307,570 CoRoT datapoints were analysed with different…
Interacting dark matter contribution to the galactic 511 keV gamma ray emission: constraining the morphology with INTEGRAL/SPI observations
Martin, Pierrick; Vincent, Aaron C.; Cline, James M.
We compare the full-sky morphology of the 511 keV gamma ray excess measured by the INTEGRAL/SPI experiment to predictions of models based on dark matter (DM) scatterings that produce low-energy positrons: either MeV-scale DM that annihilates directly into e+e- pairs, or heavy DM that inelastically scatters into an excited sta…