Search Publications
The nature of the prompt X-ray and radio emission from SN 2002ap
Ray, A.; Bhatnagar, S.; Chandra, P. +1 more
We report on the combined X-ray and radio observations of the type Ic SN 2002ap, using XMM-Newton TOO observation of M 74 and the Giant Metrewave Radio Telescope (GMRT). We account for the presence of a nearby source in the pre-supernova Chandra field of view in our measurements of the X-ray flux (0.3 - 10 KeV) 5.2 days after the explosion. The X-…
XMM-Newton light curves of the low-mass X-ray binary EXO 0748-676: Dips, eclipses, and bursts
Wijnands, R.; van den Berg, M.; Homan, J.
We present an analysis of XMM-Newton light curves of the dipping, bursting, and eclipsing low-mass X-ray binary EXO 0748-676, focusing on the variability on time scales of seconds to hours. The observed variability can be roughly divided in three types: dips, eclipses and bursts. We find that the appearance of the latter two, depends strongly on t…
Explanatory supplement of the ISOGAL-DENIS Point Source Catalogue
Alard, C.; Blommaert, J. A. D. L.; Ganesh, S. +10 more
We present version 1.0 of the ISOGAL-DENIS Point Source Catalogue (PSC), containing more than 100 000 point sources detected at 7 and/or 15 mu m in the ISOGAL survey of the inner Galaxy with the ISOCAM instrument on board the Infrared Space Observatory (ISO). These sources are cross-identified, wherever possible, with near-infrared (0.8-2.2 mu m) …
XMM-Newton observation of the ULIRG NGC 6240. The physical nature of the complex Fe K line emission
Costantini, E.; Hasinger, G.; Boller, Th. +5 more
We report on an XMM-Newton observation of the ultraluminous infrared galaxy NGC 6240. The 0.3-10 keV spectrum can be successfully modelled with: (i) three collisionally ionized plasma components with temperatures of about 0.7, 1.4, and 5.5 keV; (ii) a highly absorbed direct power-law component; and (iii) a neutral Fe Kalpha and Kbeta line. We dete…
A simple analytical expression for the power spectrum of cascading Alfvén waves in the solar wind
Laitinen, T.; Fichtner, H.; Vainio, R.
Alfvén wave transport in the solar wind, including non-linear spectral energy transfer, is studied. We present numerical solutions of wave transport using a diffusive flux function previously introduced for spectral energy transfer, and compare it with the analytical solution obtained for a convective flux function. The two models of cascading pro…
Plasma properties above coronal active regions inferred from SOHO/UVCS and radio spectrograph observations
Raymond, J. C.; Wu, R.; Kohl, J. +3 more
Information on coronal plasma was inferred from the joint analysis of type {II} radio bursts and SOHO UltraViolet Coronagraph Spectrometer (UVCS) observations. The data sample comprises 37 metric type {II} radio bursts observed by ground-based radio spectrographs in 1999, during the rising phase of the solar cycle. The coronal electron densities n…
Hipparcos red stars in the HpVT2 and VIC systems
Makarov, V. V.; Berdnikov, L. N.; Lebzelter, T. +6 more
For Hipparcos M, S, and C spectral type stars, we provide calibrated instantaneous (epoch) Cousins V - I color indices using newly derived HpVT2 photometry. Three new sets of ground-based Cousins VI data have been obtained for more than 170 carbon and red M giants. These datasets in combination with the published sources of V…
Near-IR spectra of ISOGAL sources in the inner Galactic Bulge
Omont, A.; Schultheis, M.; Ojha, D. K. +2 more
We present near-IR spectra (HK-band) of a sample of 107 sources with mid-IR excesses at 7 and 15;mu m detected during the ISOGAL survey. Making use of the DENIS interstellar extinction map from Schultheis et al. (1999) we derive luminosities and find that the Mbol vs. 12CO and M_bol vs. H2O diagrams are powerful to…
On the link between rotation, chromospheric activity and Li abundance in subgiant stars
De Medeiros, J. R.; Canto Martins, B. L.; Melo, C. H. F. +2 more
The connection rotation-CaII emission flux-lithium abundance is analyzed for a sample of bona fide subgiant stars, with evolutionary status determined from HIPPARCOS trigonometric parallax measurements and from the Toulouse-Geneva code. The distribution of rotation and CaII emission flux as a function of effective temperature shows a discontinuity…
INTEGRAL observations of the black hole candidate H 1743-322 in outburst
Parmar, A. N.; Kuulkers, E.; Oosterbroek, T. +5 more
INTEGRAL made 3 observations in 2003 April of the black hole candidate H 1743-322 during the rising part, and close to the maximum, of an outburst. H 1743-322 was previously observed in outburst in 1977-1978. The source is located in a crowded region of the sky (l = 357o, b = -2o) and at least 18 sources are clearly detected …