Search Publications
High-Resolution X-ray imaging and spectroscopy of N 103B
Kaastra, J. S.; Mewe, R.; Behar, E. +5 more
The X-ray emission from the young supernova remnant (SNR) N 103B is measured and analysed using the high-resolution cameras and spectrometers on board XMM-Newton and Chandra. The spectrum from the entire remnant is reproduced very well with three plasma components of kTe = 0.55, 0.65, and 3.5 keV, corresponding roughly to line emission …
The physical structure of Magellanic Cloud H II regions. I. Dataset
van der Hulst, J. M.; Vermeij, R.; Damour, F. +1 more
We present infrared and optical spectroscopic data for 11 H Ii regions and one Supernova Remnant in the Large and Small Magellanic Cloud. The infrared data have been obtained with the Short Wavelength Spectrometer and Long Wavelength Spectrometer on board the Infrared Space Observatory as part of a Guaranteed Time Program on H Ii regions in Local …
HST images of B2 radio galaxies: A link between circum-nuclear dust and radio properties?
Capetti, A.; Morganti, R.; de Ruiter, H. R. +2 more
Almost 60% of the B2 low luminosity radio galaxies have been observed with the Hubble Space Telescope. We present an analysis of the dust features, which are often present in the form of circum-nuclear disks or lanes, and show that there are correlations between radio source and dust properties. It is found that nearby radio sources in which a jet…
Hot dust in normal star-forming galaxies: JHKL' photometry of the ISO Key Project sample
Helou, G.; Hunt, L. K.; Giovanardi, C.
We present JHK and 3.8 mu m (L') photometry of 26 galaxies in the Infrared Space Observatory (ISO) Normal Galaxy Key Project (KP) sample and of seven normal ellipticals with the aim of investigating the origin of the 4 mu m emission. The majority of the KP galaxies, and all the ellipticals, have K-L<~ 1.0, consistent with stellar photospheres p…
Dynamical modeling of the stellar nucleus of M 31
Sridhar, S.; Sambhus, N.
We present stellar dynamical models of the lopsided, double-peaked nucleus of M 31, derived from Hubble Space Telescope (HST) photometry. A Schwarzschild-type method, in conjunction with Richardson-Lucy deconvolution, was employed to construct steadily rotating, hot, stellar disks. The stars orbit a massive dark object, on prograde and retrograde …
Additional TWA members?. Spectroscopic verification of kinematically selected TWA candidates
Zuckerman, B.; Bessell, M. S.; Song, I.
We present spectroscopic measurements of the 23 new candidate members of the TW Hydrae Association from \citet{MF}. Based on Hα and Li 6708 Å strengths together with location on a color-magnitude diagram for Hipparcos TWA candidates, we found only three possible new members (TYC 7760-0835-1, TYC 8238-1462-1, and TYC 8234-2856-1) in addition to the…
Phase-resolved X-ray and optical spectroscopy of the massive binary HD 93403
Gosset, E.; Rauw, G.; Vreux, J. -M. +4 more
We report the first results of a campaign aimed at the study of early-type binaries with the XMM-Newton observatory. Phase-resolved EPIC spectroscopy of the eccentric binary HD 93403 reveals a clear orbital modulation of the X-ray luminosity as a function of the orbital phase. Below 1.0 keV, the observed X-ray flux is modulated by the opacity of t…
Mid-infrared observations of the ultraluminous galaxies IRAS 14348-1447 , IRAS 19254-7245 , and IRAS 23128-5919
Le Floc'h, E.; Madden, S. C.; Sauvage, M. +6 more
We present a study of the three ultraluminous infrared galaxies IRAS 14348-1447, IRAS 19254-7245, and IRAS 23128-5919, based on mid-infrared (MIR) spectro-imaging (5-18 mu m) observations performed with ISOCAM. We find that the MIR emission from each system, which consists of a pair of interacting late type galaxies, is principally confined to the…
Extended mid-infrared emission from VV 114: Probing the birth of a ULIRG
Le Floc'h, E.; Cesarsky, C.; Sauvage, M. +5 more
We present our 5-16 mu m spectro-imaging observations of
Location of narrowband spikes in solar flares
Benz, A. O.; Vilmer, N.; Saint-Hilaire, P.
Narrowband spikes of the decimeter type have been identified in dynamic spectrograms of Phoenix-2 of ETH Zurich and located in position with the Nançay Radioheliograph at the same frequency. The spike positions have been compared with the location of hard X-ray emission and the thermal flare plasma in soft X-rays and EUV lines. The decimetric spik…