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Cross-correlation of Lyman α absorbers with gas-rich galaxies
Ryan-Weber, Emma V.
The HI Parkes all-sky survey (HIPASS) galaxy catalogue is cross-correlated with known low redshift, low column density (NHI < 1015cm-2) Lyman α (Lyα) absorbers from the literature. The redshift-space correlation is found to be similar in strength to HIPASS galaxy self-clustering (correlation length s0,ag
Variable iron-line emission near the black hole of Markarian 766
Nandra, K.; Turner, T. J.; Porquet, D. +4 more
Aims.We investigate the link between ionised Fe X-ray line emission and continuum emission in a bright nearby AGN, Mrk 766.
Methods: .A new long (433 ks) XMM-Newton observation is analysed, together with archival data from 2000 and 2001. The contribution from ionised line emission is measured and its time variations on short (5-20 ks) timesca…
Soft gamma-ray background and light dark matter annihilation
Fayet, Pierre; Cordier, Bertrand; Teyssier, Romain +4 more
The bulk of the extragalactic background between 10 keV and 10 GeV is likely to be explained by the emission of Seyfert galaxies, type Ia supernovae, and blazars. However, as revealed by the INTEGRAL satellite, the bulge of our galaxy is an intense source of a 511 keV gamma-ray line, indicating the production of a large number of positrons that an…
Cassini radio occultations of Saturn's ionosphere: Model comparisons using a constant water flux
Moore, Luke; Kliore, Arvydas J.; Mendillo, Michael +3 more
Recent radio occultations of Saturn's equatorial ionosphere by the Cassini spacecraft provide important insight into this poorly constrained region. Twelve new electron density profiles identify a clear dawn/dusk asymmetry as well as two apparently separate electron density peaks. This study uses a 3D general circulation model along with 1D water …
Orientation and motion of a plasma discontinuity from single-spacecraft measurements: Generic residue analysis of Cluster data
Balogh, A.; RèMe, H.; Dunlop, M. W. +3 more
A unified minimum-residue approach is presented to the use of classical conservation laws for determination of the orientation and motion of a plasma discontinuity, using data from a single spacecraft that traverses the discontinuity and makes measurements, not only on its two sides but also within it. The method is a generalization of the minimum…
First ENA observations at Mars: Subsolar ENA jet
Coates, A. J.; Kallio, E.; Fedorov, A. +43 more
The Neutral Particle Detector (NPD), an Energetic Neutral Atom (ENA) sensor of the Analyzer of Space Plasmas and Energetic Atoms (ASPERA-3) on board Mars Express, detected intense fluxes of ENAs emitted from the subsolar region of Mars. The typical ENA fluxes are (4-7) × 10 5 cm -2 sr -1 s -1 in the ener…
Multithermal Analysis of a SOHO/CDS Coronal Loop
Schmelz, J. T.; Martens, P. C. H.
The observations from 1998 April 20 taken with the Coronal Diagnostics Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) of a coronal loop on the limb have shown that the plasma was multithermal along each line of sight investigated, both before and after background subtraction. The latter result relied on emission measure (EM) l…
Study of a transient siphon flow in a cold loop
Doyle, J. G.; Madjarska, M. S.; Bradshaw, S. J. +2 more
Context: .The nature of loops is still a matter of debate with several explanations having been put forward. Simultaneous spectral and imaging data have the capacity to provide a new insight into mass motions, dynamics and energetics of loops.
Aims: .We report on spectral data taken with the Solar Ultraviolet Measurements of Emitted Radiation …
A Hard X-Ray View of Scorpius X-1 with INTEGRAL: Nonthermal Emission?
Frontera, F.; Goldoni, P.; Stella, L. +12 more
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1 and in particular a study of the hard X-ray emission of the source and its correlation with the position in the Z track of the X-ray color-color diagram. We find that the hard X-ray (above about 30 keV) emission of Sco X-1 is dominated by a power-law component with a photon index o…
Optical Structure and Proper-Motion Age of the Oxygen-rich Supernova Remnant 1E 0102-7219 in the Small Magellanic Cloud
Finkelstein, Steven L.; Ebbets, Dennis C.; Leitherer, Claus +12 more
We present new optical emission-line images of the young SNR 1E 0102-7219 in the SMC obtained with the ACS on HST. This object is a member of the oxygen-rich class of SNRs showing strong oxygen, neon, and other metal-line emissions in its optical and X-ray spectra, and an absence of hydrogen and helium. The progenitor of 1E 0102-7219 may have been…