Search Publications
A high coverage view of the thermodynamics and metal abundance in the outskirts of the nearby galaxy cluster Abell 2199
Walker, S. A.; Mirakhor, M. S.
We present a joint Suzaku and XMM-Newton analysis of the outskirts of the nearby galaxy cluster Abell 2199, the only nearby galaxy cluster to be observed with near complete azimuthal coverage with Suzaku. Using the XMM-Newton observations to correct for the effects of gas clumping, we find that the azimuthally averaged entropy profile in the outsk…
Evidence for periodic accretion-ejection in LS I +61°303
Migliari, S.; Readhead, A. C. S.; Kraus, A. +7 more
The stellar binary system LS I +61°303, composed of a compact object in an eccentric orbit around a B0 Ve star, emits from radio up to γ-ray energies. The orbital modulation of radio spectral index, X-ray, and GeV γ-ray data suggests the presence of two peaks. This two-peaked profile is in line with the accretion theory predicting two accretion-ej…
X-ray reverberation lags from the 1.5 Seyfert galaxy NGC 5273
McHardy, I.; Vincentelli, F. M.; Ingram, A. +2 more
We present the results of X-ray spectral-timing analysis of a 90 ks XMM-Newton observation of the nearby, broad-line, early-type AGN NGC5273. The X-ray spectrum revealed the clear presence of a reflection component at high energies, with a clear signature of a narrow iron line at 6.4 keV, consistent with distant reflection. Applying a relativistic…
Study of the departures from LTE in the unevolved stars infrared spectra
Bonifacio, P.; Caffau, E.; Oliva, E. +2 more
We present a study of departures from Local Thermodynamic Equilibrium (LTE) in the formation of infrared (IR) lines of Na I, Mg I, Al I, S I, K I, and Sr II in unevolved stars of spectral types F, G, K and metallicities around the solar metallicity. The purpose of this investigation is to identify lines of these species that can be safely treated …
Determination of the orbits of 62 moons of asteroids based on astrometric observations.
Emelyanov, N. V.; Drozdov, A. E.
Based on all published astrometric observations, we have determined the moon orbits for asteroids using a model of the fixed Keplerian orbit. We applied 5-114 observations for each moon. As a result, we have determined the orbits of 62 moons. All results, including the orbital parameters obtained, are presented in the tables that are provided as s…
Detection of a possible multiphase ultra-fast outflow in IRAS 13349+2438 with NuSTAR and XMM-Newton
Schartel, N.; Santos-Lleó, M.; Fabian, A. C. +6 more
We present joint NuSTAR and XMM-Newton observations of the bright, variable quasar IRAS 13349+2438. This combined data set shows two clear iron absorption lines at 8 and 9 keV, which are most likely associated with two layers of mildly relativistic blueshifted absorption, with velocities of ∼0.14c and ∼0.27c. We also find strong evidence for a ser…
Multiwavelength investigation of extended green object G19.88-0.53: revealing a protocluster
Tej, Anandmayee; Liu, Tie; Ishwara Chandra, C. H. +5 more
A multiwavelength analysis of star formation associated with the extended green object, G19.88-0.53 is presented in this paper. With multiple detected radio and millimetre components, G19.88-0.53 unveils as harbouring a protocluster rather than a single massive young stellar object. We detect an ionized thermal jet using the upgraded Giant Meterwa…
Hard-X-ray-selected active galactic nuclei - I. A radio view at high frequencies
McHardy, I.; Behar, E.; Tombesi, F. +5 more
A thorough study of radio emission in active galactic nuclei (AGNs) is of fundamental importance to understand the physical mechanisms responsible for the emission and the interplay between accretion and ejection processes. High-frequency radio observations can target the nuclear contribution of smaller emitting regions and are less affected by ab…
XMM-Newton observations of a gamma-ray pulsar J0633+0632: pulsations, cooling and large-scale emission
Zyuzin, D.; Danilenko, A.; Karpova, A. +2 more
We report results of XMM-Newton observations of a γ-ray pulsar J0633+0632 and its wind nebula. We reveal, for the first time, pulsations of the pulsar X-ray emission with a single sinusoidal pulse profile and a pulsed fraction of 23 ± 6 per cent in the 0.3-2 keV band. We confirm previous Chandra findings that the pulsar X-ray spectrum consists of …
Physical conditions of five O VI absorption systems towards PG 1522+101
Savage, Blair D.; Wakker, Bart P.; Charlton, Jane +4 more
We present the analysis of five O VI absorbers identified across a redshift path of z ~ (0.6-1.3) towards the background quasar PG 1522+101 with information on five consecutive ionization stages of oxygen from O II to O VI. The combined HST and Keck spectra cover UV, redshifted extreme-UV, and optical transitions from a multitude of ions spanning …