Search Publications
The soft X-ray characteristics of solar flares, both with and without associated CMEs
Culhane, J. L.; Green, L. M.; Harra, L. K. +2 more
The complex relationship between solar flares and coronal mass ejections is investigated using a comparison of flare parameters for a total of 69 ejective and non-ejective flares. In the case of solar flares which do not show mass ejection there seems to be a clear relationship between the peak intensity and duration, with higher intensity events …
INTEGRAL-RXTE observations of Cygnus X-1
Nowak, M. A.; Rodriguez, J.; Wilms, J. +11 more
We present first results from contemporaneous observations of Cygnus X-1 with INTEGRAL and RXTE, made during INTEGRAL's performance verification phase in 2002 November and December. Consistent with earlier results, the 3-250 keV data are well described by Comptonization spectra from a Compton corona with a temperature of kT ~ 50-90 keV and an opti…
A study of RV in Galactic O stars from the 2MASS catalogue
Patriarchi, P.; Perinotto, M.; Morbidelli, L.
We present new measurements of the interstellar reddening parameter RV=AV/E(B-V) towards 185 O stars, using J, H, Ks photometry from the 2MASS project. The results are combined with data from the literature of 95 stars where RV has been derived with the same technique, 22 of which in common with our pres…
XMM-Newton observations of the nitrogen-rich Wolf-Rayet star WR 1
Oskinova, L. M.; Ignace, R.; Brown, J. C.
We present XMM-Newton results for the X-ray spectrum from the N-rich Wolf-Rayet (WR) star WR 1. The EPIC instrument was used to obtain a medium-resolution spectrum. The following features characterize this spectrum: (a) significant emission ``bumps'' appear that are coincident with the wavelengths of typical strong lines, such as MgXI, SiXIII, and…
Gamma-ray bursts observed by the INTEGRAL-SPI anticoincidence shield: A study of individual pulses and temporal variability
Ryde, F.; von Kienlin, A.; Lund, N. +3 more
We study a set of 28 GRB light-curves detected between 15 December 2002 and 9 June 2003 by the anti-coincidence shield of the spectrometer (SPI) of INTEGRAL. During this period it has detected 50 bursts, that have been confirmed by other instruments, with a time resolution of 50 ms. First, we derive the basic characteristics of the bursts: various…
A spatially resolved limb flare on Algol B observed with XMM-Newton
Schmitt, J. H. M. M.; Ness, J. -U.; Franco, G.
We report XMM-Newton observations of the eclipsing binary Algol A (B8V) and B (K2III). The XMM-Newton data cover the phase interval 0.35-0.58, i.e., specifically the time of optical secondary minimum, when the X-ray dark B-type star occults a major fraction of the X-ray bright K-type star. During the eclipse a flare was observed with complete ligh…
Small-scale structure of the galactic cirrus emission
del Burgo, C.; Ábrahám, P.; Lemke, D. +4 more
We examined the Fourier power spectrum characteristics of cirrus structures in 13 sky fields with faint to bright cirrus emission observed with ISOPHOT in the 90-200 mu m wavelength range in order to study variations of the spectral index alpha . We found that alpha varies from field to field with -5.3 le alpha le -2.1. It depends on the absolute …
XMM-Newton observations of Nova LMC 2000
Greiner, J.; Schartel, N.; Orio, M.
We report on three X-ray observations of Nova LMC 2000 with XMM-Newton at 17, 51 and 294 days after the maximum, respectively. X-ray spectral fits show a concordant decrease of the absorbing column and the X-ray luminosity. No supersoft X-ray emission is detected. The mass of the ejected shell is determined to be (less than) 7.5 x 10-5 …
XMM-Newton study of the persistent X-ray source 1E 1743.1-2843 located in the Galactic Center direction
Goldoni, P.; Rodriguez, J.; Decourchelle, A. +4 more
We report the results of an XMM-Newton observation of the persistent X-ray source
A study of the unification of quiet-Sun transient-event phenomena
Harrison, R. A.; Brković, A.; Harra, L. K. +1 more
A number of small-scale, globally distributed solar transient event-types have been reported in the literature. Their potential role in fundamental processes in the solar atmosphere, such as coronal heating and wind acceleration, is under active investigation. However, the event-types, such as those known as blinkers, explosive events, EUV (extrem…