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Absorption Features in the X-ray Spectrum of an Ordinary Radio Pulsar
Pavlov, George G.; Kargaltsev, Oleg; Durant, Martin +1 more
The vast majority of known nonaccreting neutron stars (NSs) are rotation-powered radio and/or γ-ray pulsars. So far, their multiwavelength spectra have all been described satisfactorily by thermal and nonthermal continuum models, with no spectral lines. Spectral features have, however, been found in a handful of exotic NSs and were thought to be a…
Surface waves on Saturn's magnetopause
Coates, A. J.; Dougherty, M. K.; Jones, G. H. +3 more
Waves on the surface of a planetary magnetopause promote energy transport into the magnetosphere, representing an important aspect of solar wind-magnetosphere coupling. At Saturn's magnetopause it has been proposed that growth of the Kelvin-Helmholtz (K-H) instability produces greater wave activity on the dawn side of the surface than on the dusk …
Ground-based observations of the long-term evolution and death of Saturn's 2010 Great White Spot
Hueso, Ricardo; del Río-Gaztelurrutia, Teresa; Sánchez-Lavega, Agustín +8 more
We report on the long-term evolution of Saturn's sixth Great White Spot (GWS) event that initiated at northern mid-latitudes of the planet on December 5th, 2010 (Fletcher, L. et al. [2011]. Science 332, 1413-1417; Sánchez-Lavega, A. et al. [2011]. Nature 475, 71-74; Fischer, G. et al. [2011]. Nature 475, 75-77). We find from ground-based observati…
The Emission of Cygnus X-1: Observations with INTEGRAL SPI from 20 keV to 2 MeV
Malzac, J.; Jourdain, E.; Roques, J. P.
We report on Cyg X-1 observations performed by the SPI telescope on board the INTEGRAL mission and distributed over more than 6 years. We investigate the variability of the intensity and spectral shape of this peculiar source in the hard X-ray domain, and more particularly up to the MeV region. We first study the total averaged spectrum which pres…
Suzaku Observations of 4U 1957+11: Potentially the Most Rapidly Spinning Black Hole in (the Halo of) the Galaxy
Pottschmidt, Katja; Wilms, Jörn; Nowak, Michael A. +3 more
We present three Suzaku observations of the black hole candidate 4U 1957+11 (V1408 Aql)—a source that exhibits some of the simplest and cleanest examples of soft, disk-dominated spectra. 4U 1957+11 also presents among the highest peak temperatures found from disk-dominated spectra. Such temperatures may be associated with rapid black hole spin. Th…
Numerical Modeling of the Initiation of Coronal Mass Ejections in Active Region NOAA 9415
Poedts, S.; Zuccarello, F. P.; Meliani, Z.
Coronal mass ejections (CMEs) and solar flares are the main drivers of weather in space. Understanding how these events occur and what conditions might lead to eruptive events is of crucial importance for up to date and reliable space weather forecasting. The aim of this paper is to present a numerical magnetohydrodynamic (MHD) data-inspired model…
A statistical study of the cross-shock electric potential at low Mach number, quasi-perpendicular bow shock crossings using Cluster data
Bale, S. D.; Walker, S. N.; Balikhin, M. A. +3 more
The cross-shock electrostatic potential at the front of collision-less shocks plays a key role in the distribution of energy at the shock front. Multipoint measurements such as those provided by the Cluster II mission provide an ideal framework for the study of the cross-shock potential because of their ability to distinguish between temporal and …
Spatially resolved colours and stellar population properties in early-type galaxies at z ∼ 1.5
Longhetti, M.; Gargiulo, A.; Saracco, P. +2 more
We present F850LP - F160W colour gradients for 11 early-type galaxies (ETGs) at 1.0 < zspec < 1.9 selected from the GOODS-South field. Significant negative F850LP - F160W colour gradients (core redder than the outskirts) have been detected in ∼70 per cent of our sample within the effective radius Re, the remaining 30 pe…
Three-Dimensional Properties of Coronal Mass Ejections from STEREO/SECCHI Observations
Davies, J. A.; Bothmer, V.; Howard, R. A. +3 more
We identify 565 coronal mass ejections (CMEs) between January 2007 and December 2010 in observations from the twin STEREO/SECCHI/COR2 coronagraphs aboard the STEREO mission. Our list is in full agreement with the corresponding SOHO/LASCO CME Catalog (http://cdaw.gsfc.nasa.gov/CME_list/) for events with angular widths of 45∘ and up. The …
Study of Single-lobed Circular Polarization Profiles in the Quiet Sun
Sainz Dalda, A.; Martínez-Sykora, J.; Title, A. +1 more
The existence of asymmetries in the circular polarization (Stokes V) profiles emerging from the solar photosphere has been known since the 1970s. These profiles require the presence of a velocity gradient along the line of sight (LOS), possibly associated with gradients of magnetic field strength, inclination, and/or azimuth. We have focused our s…