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Large-scale horizontal flows in the solar photosphere. I. Method and tests on synthetic data
Švanda, M.; Sobotka, M.; Klvaňa, M.
We propose a useful method for mapping large-scale velocity fields in the solar photosphere. It is based on the local
correlation tracking algorithm when tracing supergranules in full-disc dopplergrams. The method was developed using synthetic data. The data are transformed during the data processing into a suitable coordinate system, th…A ROSAT Survey of Contact Binary Stars
McKay, T. A.; Geske, M. T.; Gettel, S. J.
Contact binary stars are common variable stars that are all believed to emit relatively large fluxes of X-rays. In this work we combine a large new sample of contact binary stars derived from the ROTSE-I telescope with X-ray data from the ROSAT All Sky Survey (RASS) to estimate the X-ray volume emissivity of contact binary stars in the Galaxy. We …
XMM-Newton Observes Cl J0152.7-1357: A Massive Galaxy Cluster Forming at Merger Crossroads at z=0.83
Priedhorsky, W.; Córdova, F. A.; Maughan, B. J. +3 more
We present an analysis of a 50 ks XMM-Newton observation of the merging galaxy cluster Cl J0152.7-1357 at z=0.83. In addition to the two main subclusters and an infalling group detected in an earlier Chandra observation of the system, XMM-Newton detects another group of galaxies possibly associated with the cluster. This group may be connected to …
Energetic Hydrogen and Oxygen Atoms Observed on the Nightside of Mars
Fedorov, A.; Barabash, S.; Lundin, R. +5 more
We present measurements of energetic hydrogen and oxygen atoms (ENAs) on the nightside of Mars detected by the neutral particle detector (NPD) of ASPERA-3 on Mars Express. We focus on the observations for which the field-of-view of NPD was directed at the nightside of Mars or at the region around the limb, thus monitoring the flow of ENAs towards …
Mining for normal galaxies in the first XMM-Newton Serendipitous Source Catalog
Georgantopoulos, I.; Chavushyan, V.; Plionis, M. +4 more
This paper uses the first XMM-Newton Serendipitous Source Catalog compiled by the XMM-Newton Science Centre to identify low-z X-ray selected normal galaxy candidates. Our sample covers a total area of ~6deg2 to the 0.5-2keV limit ~10-15ergs-1cm-2. A total of 23 sources are selected on the basis of low X-…
New radio halos and relics in clusters of galaxies
Govoni, F.; Giovannini, G.; Pizzo, R. +2 more
We present here new images of relics and halo sources in rich cluster of galaxies and the correlation between the halo radio surface brightness versus the cluster bolometric X-ray luminosity.
XMM-Newton Observations of the Bipolar Planetary Nebulae NGC 2346 and NGC 7026
Guerrero, Martín A.; Chu, You-Hua; Gruendl, Robert A. +1 more
We have obtained X-ray observations of the bipolar planetary nebulae (PNe) NGC 2346 and NGC 7026 with XMM-Newton. These observations detected diffuse X-ray emission from NGC 7026 but not from NGC 2346. The X-ray emission from NGC 7026 appears to be confined within the bipolar lobes of the PN and has spectral properties suggesting a thermal plasma …
Enigma of a Flare Involving Multiple-Loop Interactions: Emerging, Colliding Loops or Magnetic Breakout?
Holman, Gordon D.; Dennis, Brian R.; Sui, Linhui
We present observations of a C9.4 flare on 2002 June 2 in EUV (TRACE), X-rays (RHESSI), and Hα (Meudon and Ondrejov) showing evidence for multiple-loop interactions as the cause of the flare. The multiwavelength data reveal some striking phenomena that can be used to test different models for solar eruptive events: (1) involvement of a quadrupolar…
Tests of stellar model atmospheres by optical interferometry. III. NPOI and VINCI interferometry of the M0 giant γ Sagittae covering 0.5-2.2 µm
Wittkowski, M.; Hummel, C. A.; Roccatagliata, V. +1 more
Context: .Optical interferometry allows a measurement of the intensity profile across a stellar disc, leading to a direct test and calibration of theoretical model atmospheres as well as to a precise determination of fundamental stellar parameters.
Aims: .We present a comparison of the visual and near-infrared intensity profile of the M0 giant…
The XMM-Newton view of Plaskett's star and its surroundings
Rauw, G.; Pollock, A. M. T.; Stevens, I. R. +1 more
XMM-Newton data of Plaskett's star (HD 47129) are used in order to analyse its X-ray spectrum and variability and hence to derive further constraints on the wind interaction in this early-type binary (O6 I + O7.5 I) system.
Conventional models fail to provide a consistent fit of the European Photon Imaging Camera (EPIC) and Reflexion Grating …