Search Publications
The aperiodic broad-band X-ray variability of Cygnus X-3
Axelsson, Magnus; Larsson, Stefan; Hjalmarsdotter, Linnea
We study the soft X-ray variability of Cygnus X-3. By combining data from the All-Sky Monitor and Proportional Counter Array instruments on the RXTE satellite with EXOSAT/Medium Energy (ME) detector observations, we are able to analyse the power density spectrum (PDS) of the source from 10-9 to 0.1 Hz, thus covering time-scales from sec…
Binary Stars with Components of Solar Type: 25 Orbits and System Masses
Docobo, J. A.; Ling, J. F.
Revised orbits and system masses are presented for the following 25 visual double stars: WDS 00593-0040 (A 1902), WDS 00596-0111 (A 1903 AB), WDS 01023+0552 (A 2003), WDS 01049+3649 (A 1515), WDS 01234+5809 (STF 115 AB), WDS 02399+0009 (A 1928), WDS 03310+2937 (A 983), WDS 06573-3530 (I 65), WDS 07043-0303 (A 519), WDS 08267+2432 (A 1746 BC), WDS …
An X-ray spectral survey of the disc of M 31 with XMM-Newton
Kolb, U.; Osborne, J. P.; Barnard, R. +2 more
Aims: We present the results of a complete spectral survey of the X-ray point sources detected in five XMM-Newton observations along the major axis of M 31 but avoiding the central bulge, aimed at establishing the population characteristics of X-ray sources in this galaxy.
Methods: We obtained background subtracted spectra and lightcurves for …
Organizing some very tenuous things: Resonant structures in Saturn's faint rings
Hedman, M. M.; Burns, J. A.; Porco, C. C. +1 more
Images of the dusty rings obtained by the Cassini spacecraft in late 2006 and early 2007 reveal unusual structures composed of alternating canted bright and dark streaks in the outer G ring (∼170,000 km from Saturn center), the inner Roche Division (∼138,000 km) and the middle D ring (70,000-73,000 km). The morphology, locations and pattern speeds…
IGR J16351-5806: another close by Compton-thick AGN
de Rosa, A.; Bird, A. J.; Malizia, A. +2 more
IGR J16351-5806 has been associated with the Seyfert 2 galaxy ESO 137-G34, having been first reported as a high energy emitter in the third INTEGRAL/Imager on Board the INTEGRAL Satellite survey. Using a new diagnostic tool based on X-ray column density measurements versus softness ratios (F2-10keV/F20-100keV), we have previo…
Predicted γ-ray image of SN 1006 due to inverse Compton emission
Miceli, M.; Bocchino, F.; Orlando, S. +5 more
We propose a method to synthesize the inverse Compton (IC) γ-ray image of a supernova remnant starting from the radio (or hard X-ray) map and using results of the spatially resolved X-ray spectral analysis. The method is successfully applied to SN 1006. We found that synthesized IC γ-ray images of SN 1006 show morphology in nice agreement with tha…
Line-of-Sight Shell Structure of the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +3 more
We conducted a comprehensive study on the shell structure of the Cygnus Loop using 41 observation data obtained by the Suzaku and the XMM-Newton satellites. To investigate the detailed plasma structure of the Cygnus Loop, we divided our fields of view into 1042 box regions. From the spectral analysis, the spectra obtained from the limb of the Loop…
Chandra's Close Encounter with the Disintegrating Comets 73P/2006 (Schwassmann-Wachmann 3) Fragment B and C/1999 S4 (LINEAR)
Bodewits, D.; Christian, D. J.; Dennerl, K. +2 more
On 2006 May 23, we used the ACIS-S instrument on Chandra to study the X-ray emission from the B fragment of comet 73P/2006 (Schwassmann-Wachmann 3) (73P/B). We obtained a total of 20 ks of Chandra observation time of Fragment B, and also investigated contemporaneous Advanced Composition Explorer and Solar and Heliospheric Observatory solar wind ph…
A magnetospheric generator driving ion and electron acceleration and electric currents in a discrete auroral arc observed by Cluster and DMSP
Roth, M.; De Keyser, J.; Maggiolo, R. +1 more
Simultaneous observations on April 28, 2001 by Cluster and DMSP-F14 reveal a stable discrete auroral arc and fluxes of field-aligned accelerated electrons and ions coincident with a magnetospheric plasma interface at an altitude of 4.5 RE in the dusk sector. We compare satellite data with a quasi-stationary magnetosphere-ionosphere coup…
Cross-scale: multi-scale coupling in space plasmas
Sahraoui, Fouad; Horbury, Timothy; Sauvaud, Jean-André +17 more
Most of the visible universe is in the highly ionised plasma state, and most of that plasma is collision-free. Three physical phenomena are responsible for nearly all of the processes that accelerate particles, transport material and energy, and mediate flows in systems as diverse as radio galaxy jets and supernovae explosions through to solar fla…