Search Publications
Analysis of Cassini magnetic field observations over the poles of Rhea
Dougherty, Michele K.; Saur, Joachim; Kriegel, Hendrik +5 more
We analyze Cassini magnetic field observations from the only two polar flybys of Saturn's largest icy satellite Rhea (R2 on 02 March 2010 and R3 on 11 January 2011) which are scheduled between Saturn Orbit Insertion and the end of the mission in 2017. For the interpretation of these data, we apply estimations from simple analytical models as well …
Initiation and Development of the White-light and Radio Coronal Mass Ejection on 2001 April 15
Pick, M.; Démoulin, P.; Vourlidas, A. +1 more
The 2001 April 15 event was one of the largest of the last solar cycle. A former study established that this event was associated with a coronal mass ejection (CME) observed both at white light and radio frequencies. This radio CME is illuminated by synchrotron emission from relativistic electrons. In this paper, we investigate the relation of the…
The Faint End of the Cluster-galaxy Luminosity Function at High Redshift
Wright, Edward L.; Eisenhardt, Peter R. M.; Gonzalez, Anthony H. +7 more
We measure the faint-end slope of the galaxy luminosity function (LF) for cluster galaxies at 1 < z < 1.5 using Spitzer IRAC data. We investigate whether this slope, α, differs from that of the field LF at these redshifts, and with the cluster LF at low redshifts. The latter is of particular interest as low-luminosity galaxies are expected t…
A mid-IR study of the circumstellar environment of Herbig Be stars
Waters, L. B. F. M.; Pantin, E.; van Boekel, R. +7 more
Context. The study of the formation of massive stars is complicated because of the short times scales, large distances, and obscuring natal clouds. There are observational and theoretical indications that the circumstellar environment of Herbig Be (HBe) stars is substantially different from that of their lower mass counterparts, the T Tauri and He…
A Significant Problem with Using the Amati Relation for Cosmological Purposes
Collazzi, Andrew C.; Schaefer, Bradley E.; Goldstein, Adam +1 more
We consider the distribution of many samples of gamma-ray bursts when plotted in a diagram with their bolometric fluence (S bolo) versus the observed photon energy of peak spectral flux (E peak, obs). In this diagram, all bursts that obey the Amati relation (a luminosity relation where the total burst energy has a power-law r…
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…