Search Publications
Physical and kinematical properties of the X-ray absorber in the broad absorption line quasar APM 08279+5255
Ramírez, J. M.
Context: We have re-analyzed the X-ray spectra of the gravitational lensed high-redshift BAL QSO APM 08279+5255, observed with the XMM-Newton and Chandra observatories. Previous studies (Hasinger et al. 2002, ApJ, 573, L77; Chartas et al. 2002, ApJ, 579, 169) detected unusual, highly-ionized iron absorption features, but differed in their interpre…
Post-hoc derivation of SOHO Michelson doppler imager flat fields
Potts, H. E.; Diver, D. A.
Context: The SOHO satellite now offers a unique perspective on the Sun as it is the only space-based instrument that can provide large, high-resolution data sets over an entire 11-year solar cycle. This unique property enables detailed studies of long-term variations in the Sun. One significant problem when looking for such changes is determining …
The 2007 outburst of the X-ray binary XTE J1856+053
Greiner, J.; Sala, G.; Ajello, M. +1 more
Aims: On 28 February 2007 a new outburst of the previously known transient source XTE J1856+053 was detected with RXTE/ASM. We present here the results of an XMM-Newton (0.5-10.0 keV) Target of Opportunity observation performed on 14 March 2007, aimed at constraining the mass of the compact object in this X-ray binary and determining its main prop…
Meteoroid and space debris impacts in grazing-incidence telescopes
Carpenter, J. D.; Wells, A.; Abbey, A. F. +1 more
Context: Micrometeoroid or space debris impacts have been observed in the focal planes of the XMM-Newton and Swift-XRT (X-ray Telescope) X-ray observatories. These impacts have resulted in damage to, and in one case the failure of, focal-plane Charge-Coupled Device (CCDs) detectors.
Aims: We aim to quantify the future risks of focal-plane impa…
The X-ray emission of the most luminous 3CR radio sources
Salvati, M.; Risaliti, G.; Véron, P. +1 more
Context: Although many radio-loud quasars and galaxies have been observed in X-rays, systematic studies of well defined samples are rare.
Aims: We investigate the X-ray properties of the most luminous radio sources in the 3CR catalogue, in order to assess whether they are similar to the most luminous radio-quiet quasars, for instance in the X-…
The emission-line spectrum of the UV deficient quasar Ton 34: evidence of shock excitation?
Binette, L.; Krongold, Y.
Context: Emission lines in quasars are believed to originate from a photoionized plasma. There are, however, some emission features that appear to be collisionally excited, such as the Fe II multiplet bands. Shortward of Lyα, there are also a few permitted lines of species from low to intermediate ionization.
Aims: Ton 34 (z_q=1.928) exhibits …
A study of the Martian water vapor over Hellas using OMEGA and PFS aboard Mars Express
Bibring, J. -P.; Gondet, B.; Langevin, Y. +8 more
We used the OMEGA imaging spectrometer aboard Mars Express to study the evolution of the water vapor abundance over the Hellas basin, as a function of the seasonal cycle. The H2O column density is found to range from very low values (between southern fall and winter) up to more than 15 pr-µm during southern spring and summer. The general beh…
Detection of a hot intergalactic medium in the spiral-only compact group SCG0018-4854
Reeves, J.; Trinchieri, G.; Iovino, A. +4 more
Aims: Compact groups of galaxies are excellent laboratories for studying galaxy interactions and their effects on the evolution of galaxies. In particular, dynamically young systems, with a large fraction of interacting, late type galaxies, have so far escaped proper studies in the X-ray band and their hot intergalactic medium properties are virtu…
Kinematics and H{2} morphology of the multipolar post-AGB star IRAS 16594-4656
van Hoof, P. A. M.; Ueta, T.; Reyniers, M. +2 more
Context: The spectrum of IRAS 16594-4656 shows shock-excited H2 emission and collisionally excited emission lines such as [O i], [C i], and [Fe ii].
Aims: The goal is to determine the location of the H2 and [Fe ii] shock emission, to determine the shock velocities, and to constrain the physical properties in the shock.
Methods: High resolu…
XMM-Newton observations of the Small Magellanic Cloud: RX J0105.9-7203, a 726 s Be/X-ray binary pulsar
Haberl, F.; Eger, P.
Aims: To investigate the Be/X-ray binary candidate RX J0105.9-7203 in the Small Magellanic Cloud (SMC), we analysed twenty-two archival XMM-Newton observations around the calibration target 1E 0102.2-7218.
Methods: We performed spectral and temporal analyses on the EPIC data of fifteen observations. We disregarded the data of one observation d…