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Estimating the capture and loss of cold plasma from ionospheric outflow
Nilsson, H.; André, M.; Eriksson, A. +9 more
An important source of magnetospheric plasma is cold plasma from the terrestrial ionosphere. Low energy ions travel along the magnetic field lines and enter the magnetospheric lobes where they are convected toward the tail plasma sheet. Recent observations indicate that the field aligned ion outflow velocity is sometimes much higher than the conve…
XMM-Newton observations of GX 13 + 1: correlation between photoionised absorption and broad line emission
Díaz Trigo, M.; Parmar, A. N.; Boirin, L. +1 more
We analysed data from five XMM-Newton observations of GX 13 + 1 to investigate the variability of the photo-ionised absorber in this source. We fitted EPIC and RGS spectra obtained from the "least-variable" intervals with a model consisting of disc-blackbody and blackbody components together with a Gaussian emission feature at ~6.55-6.7 keV modifi…
Investigating the spectroscopic, magnetic and circumstellar variability of the O9 subgiant star HD 57682
Kaper, L.; Rivinius, Th.; Ribeiro, J. +12 more
The O9IV star HD 57682, discovered to be magnetic within the context of the Magnetism in Massive Stars (MiMeS) survey in 2009, is one of only eight convincingly detected magnetic O-type stars. Among this select group, it stands out due to its sharp-lined photospheric spectrum. Since its discovery, the MiMeS Collaboration has continued to obtain sp…
On the Role of the Accretion Disk in Black Hole Disk-Jet Connections
Fabian, A. C.; Miller, J. M.; Nowak, M. A. +5 more
Models of jet production in black hole systems suggest that the properties of the accretion disk—such as its mass accretion rate, inner radius, and emergent magnetic field—should drive and modulate the production of relativistic jets. Stellar-mass black holes in the "low/hard" state are an excellent laboratory in which to study disk-jet connection…
Galaxy cluster outskirts: a universal entropy profile for relaxed clusters?
Fabian, A. C.; Sanders, J. S.; Walker, S. A. +1 more
We fit a functional form for a universal intracluster medium entropy profile to the scaled entropy profiles of a catalogue of X-ray galaxy cluster outskirts results, which are all relaxed cool core clusters at redshift below 0.25. We also investigate the functional form suggested by Lapi et al. and Cavaliere et al. for the behaviour of the entropy…
Early-type Galaxies at z ~ 1.3. IV. Scaling Relations in Different Environments
Demarco, R.; Tanaka, M.; Rosati, P. +15 more
We present the Kormendy and mass-size relations (MSR) for early-type galaxies (ETGs) as a function of environment at z ~ 1.3. Our sample includes 76 visually classified ETGs with masses 1010 < M/M ⊙ < 1011.5, selected in the Lynx supercluster and in the Great Observatories Origins Deep Survey/Chandra Deep Fie…
Magnetotail dipolarization front and associated ion reflection: Particle-in-cell simulations
Shay, M. A.; Wu, P.
For the Earth magnetotail, the Svenes et al. (2008) statistical study infers the lobe density to be highly variable, in the range of 0.007-0.092 cm-3. Such lobe density variation modifies reconnection diffusion region physical processes and reconnection rate drastically. This letter addresses observable reconnection signatures in the vi…
The structure of Titan’s atmosphere from Cassini radio occultations: Occultations from the Prime and Equinox missions
French, Richard G.; Flasar, F. Michael; Marouf, Essam A. +7 more
We present the results of six soundings of the atmosphere of Titan by the radio occultation technique using the Cassini spacecraft currently in orbit around Saturn. These occultations occurred during four separate targeted Titan encounters in both the Prime and Equinox missions of Cassini over 3 years. They cover a wide range of latitude from 75°S…
An independent distance estimate to CW Leonis
Blommaert, J. A. D. L.; Olofsson, G.; Gomez, H. L. +13 more
CW Leo has been observed six times between October 2009 and June 2012 with the SPIRE instrument on board the Herschel satellite. Variability has been detected in the flux emitted by the central star with a period of 639 ± 4 days, in good agreement with determinations in the literature. Variability is also detected in the bow shock around CW Leo th…
The XMM deep survey in the CDF-S. II. A 9-20 keV selection of heavily obscured active galaxies at z > 1.7
Brandt, W. N.; Vignali, C.; Gilli, R. +10 more
We present results on a search of heavily obscured active galaxies z > 1.7 using the rest-frame 9-20 keV excess for X-ray sources detected in the deep XMM-CDFS survey. Out of 176 sources selected with the conservative detection criteria (>8σ) in the first source catalogue of Ranalli et al. (in prep.), 46 objects lie in the redshift range of …