Search Publications
Spectral shape of the UV ionizing background and O VI absorbers at z ∼ 1.5 towards HS 0747+4259
Reimers, D.; Hagen, H. -J.; Lopez, S. +5 more
Aims.We report on high resolution spectra of the bright QSO
INTEGRAL high energy behaviour of 4U 1812-12
Götz, D.; Capitanio, F.; Bird, A. J. +5 more
The low mass X-ray binary system 4U 1812-12 was monitored with the INTEGRAL observatory in the period 2003-2004 and with BeppoSAX on April 20, 2000. We report here on the spectral and temporal analysis of both persistent and burst emission. The full data set confirms the persistent nature of this burster, and reveals the presence of emission up to…
Long observations of the BALQSO LBQS 2212-1759 with XMM-Newton
Clavel, J.; Schartel, N.; Tomas, L.
Very long (172 ks effective exposure time) observations of the BALQSO
Irradiated atmospheres of accreting magnetic white dwarfs with an application to the polar AM Herculis
Gänsicke, B. T.; Beuermann, K.; König, M.
We present a pilot study of atmospheres of accreting magnetic white dwarfs irradiated by intense fluxes at ultraviolet to infrared wavelengths. The model uses a standard LTE stellar atmosphere code which is expanded by introducing an angle-dependent external radiation source. The present results are obtained for an external source with the spectra…
The non-constant slope of the C IV Baldwin effect in NGC 4151
Wang, R.; Han, J. L.; Wu, X. -B. +2 more
Context: .The relationship between the emission-line equivalent width and the continuum luminosity, called the Baldwin effect, is important for studies of the physics of the broad-line region of AGNs. Some recent studies have revealed the non-constant slope of the intrinsic Baldwin effect for several Seyfert 1 galaxies.
Aims: .Using the archiv…
On the multiwavelength spectrum of the microquasar 1E 1740.7-2942
Bassani, L.; Bazzano, A.; Del Santo, M. +3 more
Context: .The microquasar 1E 1740.7-2942 is a source located in the direction of the Galactic Center. It has been detected at X-rays, soft gamma-rays, and in the radio band, showing an extended radio component in the form of a double-sided jet. Although no optical counterpart has been found so far for 1E 1740.7-2942, its X-ray activity strongly po…
Planetary nebula candidates in extragalactic young star clusters
Larsen, S. S.; Richtler, T.
Context: .During an analysis of optical spectra of 80 young star clusters in several nearby spiral galaxies, [O III] and [N II] emission lines were noted in some cases. Three of these emission line sources are associated with clusters older than 30 Myr, and are identified as likely planetary nebula (PN) candidates.
Aims: .These objects may re…
Properties and nature of Be stars. 24. Better data and model for the Be+F binary V360 Lacertae
Wolf, M.; Harmanec, P.; Yang, S. +10 more
Aims.We include existing photometric and spectroscopic material with new observations in a detailed study of the Be+F binary
Methods: .We used the programs FOTEL and KOREL to derive an improved linear ephemeris and to disentangle the line profiles of both binary components and telluric lines. The BINSYN software su…
Recent star formation in the inner Galactic Bulge seen by ISOGAL. I. Classification of bright mid-IR sources in a test field
Price, S. D.; Glass, I. S.; Omont, A. +3 more
Context.The stellar populations in the central region of the Galaxy are poorly known because of the high visual extinction and very great source density in this direction.
Aims.To use recent infrared surveys for studying the dusty stellar objects in this region.
Methods.We analyse the content of a ∼20×20 arcmin2 field centred at (…
XMM-Newton and ESO observations of the two unidentified γ-ray sources 3EG J0616-3310 and 3EG J1249-8330
Bignami, G. F.; Schirmer, M.; Hatziminaoglou, E. +3 more
The limited angular resolution of γ-ray telescopes prevents a direct identification of the majority of sources detected so far. This is particularly true for the low latitude, probably galactic, ones only 10% of which has been identified. Most counterparts of the identified low-latitude γ-ray sources are Isolated Neutron Stars (INS), both radio-lo…