Search Publications
High resolution soft X-ray spectroscopy of M 87 with the reflection grating spectrometers on XMM-Newton
Böhringer, H.; Kaastra, J. S.; Branduardi-Raymont, G. +11 more
We present high-resolution X-ray spectroscopic observations of M 87 with the Reflection Grating Spectrometers on XMM-Newton. We detect strong K-shell line emission from N, O, Ne, Mg, some emission from He-like Si, a fully resolved set of Fe L-shell emission spectra, and some emission from C. The angular intensity distributions of the strong emissi…
Solar p-modes and surface magnetic fields: Is there an acoustic emission?. MDI/SOHO observations
Haber, D.; Jain, R.
We study the effect of magnetism on the surface amplitude of p-modes by creating power maps using Doppler velocity, line-depth and continuum intensity data taken by the Michelson Doppler Interferometer (MDI) instrument on board SOHO. This analysis, using proper tracking procedures, of MDI line-depth data and its comparison with the simultaneous Do…
Evolution of very small particles in the southern part of Orion B observed by ISOCAM
Perault, M.; Olofsson, G.; Boulanger, F. +19 more
We present ISOCAM observations (5-18 mu m) of the southern part of Orion B, including the reflection nebula NGC 2023 and the Horsehead nebula illuminated by the B star HD 37903 and the O star sigma Orionis, respectively. Due to the limited radiation field, the emission in these wavelengths is due to very small particles which are heated each time …
XMM-NEWTON observation of Abell 1835: Temperature, mass and gas mass fraction profiles
Reiprich, T. H.; Majerowicz, S.; Neumann, D. M.
We present a study of the medium distant cluster of galaxies Abell 1835 based on XMM-NEWTON data. The high quality of XMM-NEWTON data enable us to perform spectro-imaging of the cluster up to large radii. We determine the gas and total mass profiles based on the hydrostatic approach using the beta-model and the temperature profile. For the determi…
XMM-Newton observations of ultraluminous X-ray sources in nearby galaxies
Cappi, M.; Piconcelli, E.; Foschini, L. +9 more
An XMM-Newton study of ultraluminous X-ray sources (ULX) has been performed in a sample of 10 nearby Seyfert galaxies. Eighteen ULX have been found with positional uncertainty of about 4''. The large collecting area of XMM-Newton makes the statistics sufficient to perform spectral fitting with simple models in 8 cases. The main results of the pres…
Carbon-rich giants in the HR diagram and their luminosity function
Bergeat, J.; Knapik, A.; Rutily, B.
The luminosity function (LF) of nearly 300 Galactic carbon giants is derived. Adding BaII giants and various related objects, about 370 objects are located in the RGB and AGB portions of the theoretical HR diagram. As intermediate steps, (1) bolometric corrections are calibrated against selected intrinsic color indices; (2) the diagram of photomet…
Supernova 1998bw - the final phases
Panagia, N.; Sollerman, J.; Lundqvist, P. +10 more
The probable association with
86 GHz SiO maser survey of late-type stars in the Inner Galaxy. I. Observational data
Menten, K. M.; Omont, A.; Habing, H. J. +2 more
We present 86 GHz (v = 1, J = 2 -> 1) SiO maser line observations with the IRAM 30-m telescope of a sample of 441 late-type stars in the Inner Galaxy ( -4 degr < l < +30 degr ). These stars were selected on the basis of their infrared magnitudes and colours from the ISOGAL and MSX catalogues. SiO maser emission was detected in 271 sources…
Deep Lyα imaging of two z = 2.04 GRB host galaxy fields
Pedersen, H.; Fynbo, J. P. U.; Gorosabel, J. +8 more
We report on the results of deep narrow-band Lyα and broad-band U and I imaging of the fields of two Gamma-Ray bursts at redshift z=2.04 (GRB 000301C and GRB 000926). We find that the host galaxy of GRB 000926 is an extended (more than 2 arcsec), strong Lyα emitter with a rest-frame equivalent width of 71+20-15 Å. The galaxy …
Evidence for chemical evolution in the spectra of high redshift galaxies
Böhm, A.; Stahl, O.; Noll, S. +13 more
Using a sample of 57 VLT FORS spectra in the redshift range 1.37<z<3.40 (selected mainly from the FORS Deep Field survey) and a comparison sample with 36 IUE spectra of local (z ~ 0) starburst galaxies we derive C IV and Si IV equivalent width values and estimate metallicities of starburst galaxies as a function of redshift. Assuming that a …