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Relativistic Fe line emission and highly photoionized absorption in GRO J1655-40
Díaz Trigo, M.; Miller, J. M.; Kuulkers, E. +1 more
We report on two XMM-Newton and simultaneous INTEGRAL observations of the microquasar GRO J1655-40 during its 2005 outburst. The source was most probably in its high-soft state during both observations. There is evidence for the presence of both a relativistically broadened Fe line providing strong support for the existence of a spinning black hol…
Host galaxy evolution in radio-loud AGN
Urry, C. Megan; O'Dowd, Matt
We investigate the luminosity evolution of the host galaxies of radio-loud AGN through Hubble Space Telescope imaging of 72 BL Lac objects. This sample has enabled us to avoid the biases implicit in quasar studies. We find that the host galaxies of BL Lacs evolve strongly, consistent with that observed in the hosts of other radio-loud AGN, and inc…
Magnetars' Giant Flares: the Case of SGR 1806 20
Mereghetti, Sandro; Turolla, Roberto; Tiengo, Andrea +4 more
We report on the properties of the SGR 1806 20's Giant Flare occurred on 2004 December 27th, with particular interest on the pre and post flare intensity/hardness correlated variability. We show that these findings are consistent with the picture of a twisted internal magnetic field which stresses the star solid crust, until the latter is not able…
Precessional correction and the proper-motion systems of FK5 and Hipparcos
Zhu, Z.
Comparing proper motions of the FK5 and Hipparcos, several authors declared that the two proper-motion systems are inconsistent with the value of the precessional correction obtained from VLBI and LLR observations. Based on the proper-motion data from the PPM and ACRS catalogues which are constructed on the FK5 system, the discrepant values of the…
Introduction to the Venus Express special issue
Taylor, Fredric W.
Cluster observations of a magnetic field cavity in the plasma sheet
Davies, J. A.; Wild, J. A.; Fazakerley, A. N. +6 more
During the recovery phase of a substorm occurring on 1 September 2002 the four Cluster spacecraft crossed from the northern tail lobe into the plasma sheet. While the spacecraft were located in the plasma sheet boundary layer, the magnetic field data from the four spacecraft detected a cavity of close to zero magnetic field. The plasma in this cav…
Search for Dark Matter with GLAST
Morselli, Aldo
The detection of gamma-rays, antiprotons and positrons due to pair annihilation of dark matter particles in the Milky Way halo is a viable techniques to search for supersymmetric dark matter candidates. In particular the EGRET team has seen a convincing signal for a strong excess of emission from the Galactic center that has no simple explanation …
XMM-Newton monitoring observations of Mrk 3
Nandra, K.; Georgantopoulos, I.; Akylas, A.
We present monitoring analysis of 8 XMM-Newton observations of the Seyfert 2 galaxy Mrk 3, spanning a period of ∼19 months. The continuum flux in the 3-12 keV band remains constant during this observing period. The X-ray spectrum is well described, in agreement with previous works, by a highly absorbed (N_H>1024 cm-2) powe…
Search for the periodicity in brightness and radial velocity variations of the runaway star HD 218915
Barannikov, A. A.
An analysis of the variations in the brightness and radial velocity of the high-velocity (runaway) star HD 218915 based on the author's ground-based Crimean observations and from Hipparcos data is presented. The analysis leads to the conclusion that there is a periodic component in the brightness and radial velocity variations of HD 218915. The pe…
``The ESA XMM-Newton Science Operations Centre: Making Basic Space Science Available to the Whole Scientific World''
Metcalfe, Leo; Guainazzi, Matteo; Gabriel, Carlos
XMM-Newton is a major X-ray observatory of the European Space Agency (ESA). Its observing time is open to astronomers from the whole scientific community on a peer reviewed competitive basis. The Science Operations Centre, located at ESA's premises in Villafranca del Castillo, Spain, is responsible for the instrument operations, as well as for all…