Search Publications
The 17-22 October (1999) solar-interplanetary-geomagnetic event: Very intense geomagnetic storm associated with a pressure balance between interplanetary coronal mass ejection and a high-speed stream
Balmaceda, Laura A.; Dal Lago, Alisson; Gonzalez, Walter D. +9 more
Using observations from the Advanced Composition Explorer (ACE) magnetic field and plasma experiments, we investigate the magnetic, thermal, and dynamic pressure balance in the border of a high-speed stream (HSS) and an average-speed interplanetary coronal mass ejection (ICME) observed on 21-22 October (1999). We believe that the HSS compressed th…
[TiII] and [NiII] emission from the strontium filament of η Carinae
Gull, T. R.; Smith, N.; Bautista, M. A. +2 more
We study the nature of the [TiII] and [NiII] emission from the so-called strontium filament found in the ejecta of η Carinae. To this purpose, we employ multilevel models of the TiII and NiII systems, which are used to investigate the physical condition of the filament and the excitation mechanisms of the observed lines. For the TiII ion, for whic…
A short hard X-ray flare from the blazar NRAO 530 observed by INTEGRAL
Maraschi, L.; Ghisellini, G.; Pian, E. +6 more
We report about a short flare from the blazar NRAO 530 occurred on 17 February 2004 and detected serendipitously by the IBIS/ISGRI detector on board INTEGRAL. In the 20-40 keV energy range, the source, that is otherwise below the detection limit, is detected at a level of ≈2 × 10-10 erg cm-2 s-1 during a time inter…
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 …