Search Publications
XMM-Newton observations of 4 luminous radio-quiet AGN, and the soft X-ray excess problem
Bianchi, S.; Jiménez-Bailón, E.; Matt, G. +1 more
Context: The nature and origin of the soft X-ray excess in radio-quiet AGN is still an open issue. The interpretation in terms of thermal disc emission has been challanged by the discovery of the constancy of the effective temperature despite the wide range of Black Hole masses of the observed sources. Alternative models are reflection from ionize…
Diameter and photospheric structures of Canopus from ;AMBER/VLTI interferometry
Millour, F.; Domiciano de Souza, A.; Bendjoya, P. +2 more
Context: Direct measurements of fundamental parameters and photospheric structures of post-main-sequence intermediate-mass stars are required for a deeper understanding of their evolution.
Aims: Based on near-IR long-baseline interferometry we aim to resolve the stellar surface of the F0 supergiant star Canopus, and to precisely measure its an…
Titan's rotational state. The effects of a forced ``free'' resonant wobble
Noyelles, Benoît
In Noyelles et al. (Astron. Astrophys. 478, 959–970 (2008)), a resonance involving the wobble of Titan is hinted at. This paper studies this scenario and its consequences. The first step is to build an accurate analytical model that would help to find the likely resonances in the rotation of every synchronous body. In this model, I take the orbita…
A Study of Solar Radio Bursts with Fine Structures during Flare/CME Events
Huang, J.; Yan, Y. H.; Liu, Y. Y.
We have selected 27 solar microwave burst events recorded by the Solar Broadband Radio Spectrometer (SBRS) of China, which were accompanied by M/X class flares and fast CMEs. A total of 70.4% of radio burst events peak at 2.84 GHz before the peaks of the related flares' soft X-ray flux with an average time difference of about 6.7 minutes. Almost a…
Multiple cusps during an extended northward IMF period with a significant By component
Winningham, J. D.; Wing, S.; Balogh, A. +11 more
On 21-22 March 2001, four cusp-like regions were observed consecutively in about five hours by all four Cluster spacecraft when the interplanetary magnetic field (IMF) was northward with a significant By component. All four cusp-like encounters were characterized by turbulent magnetic fields, high-density plasma, and plasma flow signifi…
OMCat: Catalog of Serendipitous Sources Detected with the XMM-Newton Optical Monitor
Snowden, Steven L.; Kuntz, K. D.; Mushotzky, Richard F. +2 more
The Optical Monitor Catalog of serendipitous sources (OMCat) contains entries for every source detected in the publicly available XMM-Newton Optical Monitor (OM) images taken in either the imaging or “fast” modes. Since the OM is coaligned and records data simultaneously with the X-ray telescopes on XMM-Newton, it typically produces images in one …
INTEGRAL, XMM-Newton and ESO/NTT identification of AX J1749.1-2733: an obscured and probably distant Be/X-ray binary
Chaty, S.; Zurita Heras, J. A.
Context: AX J1749.1-2733 is an unclassified transient X-ray source discovered during surveys by ASCA in 1993-1999. The transient behaviour and the short and bright flares of the source have led to the idea that it is part of the recently revealed subclass of supergiant fast X-ray transients.
Aims: A multi-wavelength study in NIR, optical, X-ra…
Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +4 more
Aims: We combined bispectrum speckle interferometry, adaptive optics (AO) imaging polarimetry, and radiative transfer modeling of polarized light to derive various physical properties of the proto-planetary nebula Frosty Leo.
Methods: We performed bispectrum K'-band speckle interferometry and H- and K-band imaging polarimetry of Frosty Leo usi…
XMM-Newton observations of the Small Magellanic Cloud: XMMU J004814.1-731003, a 25.55 s Be/X-ray binary pulsar
Pietsch, W.; Haberl, F.; Sasaki, M. +2 more
Aims: To investigate candidates for Be/X-ray binaries in the Small Magellanic Cloud (SMC), we observed a region around the emission nebula N19 with XMM-Newton in October 2006.
Methods: We analysed the EPIC data of the detected point sources to derive their spectral and temporal characteristics.
Results: We detected X-ray pulsations with a …
Asymmetric Ejecta Distribution of the Cygnus Loop Revealed with Suzaku
Miller, Eric D.; Katsuda, Satoru; Mori, Koji +4 more
We observed a linearly sliced area of the Cygnus Loop from the north-east to the south-west with Suzaku in seven pointings. After dividing the entire fields of view (FOV) into 119 cells, we extracted spectra from all of the cells and performed spectral analysis for them. We then applied both one- and two-component non-equilibrium ionization (NEI) …