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Multi-frequency study of extragalactic supernova remnants and H II regions. Sculptor group Sd galaxy NGC 300
White, G. L.; Filipović, M. D.; Payne, J. L. +4 more
We present a multi-frequency study of supernova remnants (SNRs) and H I I regions in the nearby Sculptor Group Sd galaxy NGC 300, based on new ATCA observations at the wavelengths of 13 and 20 cm, XMM-Newton observations, newly-processed ROSAT (PSPC/HRI; \citealt{read}) and VLA (20/6 cm) images of this galaxy. We have investigated the physical pro…
Tiny-scale molecular structures in the Magellanic Clouds. I. FUSE, HST and VLT observations
Le Petit, F.; Roueff, E.; André, M. K. +6 more
The objective of this series of two papers is to investigate small-scale molecular structures in the Magellanic Clouds (hereafter MCs). We report on the FUSE detections of the HD and CO molecules on the lines of sight towards three Large Magellanic stars: Sk -67D05, Sk -68D135, and Sk -69D246. HD is also detected for the first time on the lines of…
Abundance constraints and direct redshift measurement of the diffuse X-ray emission from a distant cluster of galaxies
Böhringer, H.; Barcons, X.; Fabian, A. C. +4 more
We report on the XMM-Newton (XMM) observation of RX J1053.7+5735, one of the most distant X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of a possible equal-mass cluster merger. The cluster was discovered during the ROSAT deep pointings in the direction of the Lockman Hole. All XMM Lockma…
Solar cycle dependence of the apparent radius of the Sun
Noël, F.
Visual astrometric observations of the Sun covering the second and first part of solar cycles 22 and 23 respectively, have been carried out during the last 13 years with the Danjon astrolabe of Santiago, Chile. These observations give, among other solar parameters, an absolute value of the Sun's apparent radius. We report here the results obtained…
An X-ray review of MS 1054-0321: Hot or not?
Braito, V.; Tran, K. -V.; Della Ceca, R. +3 more
XMM-Newton observations are presented for the z=0.83 cluster of galaxies MS 1054-0321, the highest redshift cluster in the Einstein Extended Medium Sensitivity Survey (EMSS). The temperature inferred by the XMM-Newton data, T=7.2+0.7-0.6 keV, is much lower than the temperature previously reported from ASCA data, T=12.3+3…
The influence of density stratification and multiple nonlinearities on solar torsional oscillations
Covas, E.; Moss, D.; Tavakol, R.
Analyses of recent helioseismic data have produced ample evidence for substantial dynamical variation of the differential rotation within the solar convection zone. Given the inevitable difficulties in resolving the precise nature of variations in deeper layers, much effort has recently gone into determining theoretically the expected modes of beh…
Temperature map computation for X-ray clusters of galaxies
Bijaoui, A.; Bourdin, H.; Slezak, E. +2 more
Recent numerical simulations have shown that the variations of the gas temperature in clusters of galaxies are indicative of the dynamical state of these clusters. Maps of the temperature variation show complex structures with different shapes at different spatial scales, such as hot compression regions, filaments, cooling flows, or large-scale te…
Origin of diffuse C II 158 micron and Si II 35 micron emission in the Carina nebula
Onaka, T.; Shibai, H.; Mizutani, M.
We present the results of mapping observations with ISO of [O I] 63 µm, 145 µm, [N II] 122 µm, [C II] 158 µm, [Si II] 35 µm, and H_2 9.66 µm line emissions for the Carina nebula, an active star-forming region in the Galactic plane. The observations were made for the central 40 arcmin × 20 arcmin area of the nebu…
On the importance of the few most massive stars: The ionizing cluster of NGC 588
Vílchez, J. M.; González Delgado, R. M.; Cerviño, M. +3 more
We present the results of a double analysis of the ionizing cluster in
Physical interpretation of the NGC 7469 UV/X-ray variability
Maraschi, L.; Nandra, K.; Petrucci, P. O. +1 more
We present a re-analysis of the simultaneous ∼30 day IUE/XTE observation of NGC 7469 done in 1996. Our main progress in this paper, in comparison to previous spectral analyses (Nandra et al. \cite{nan98,nan00}), is to adopt and fit directly to the data a detailed model of the Comptonized spectrum. This firstly allows one to fit simultaneously the …