Search Publications
Hard X-ray timing and spectral characteristics of the energetic pulsar PSR J0205+6449 in supernova remnant 3C 58. An RXTE PCA/HEXTE and XMM-Newton view on the 0.5-250 keV band
Kuiper, L.; Hermsen, W.; den Hartog, P. R. +3 more
Context. PSR J0205+6449 is a young rotation-powered pulsar in SNR 3C 58. It is one of only three young (<10 000 year old) pulsars that have so far been detected in the radio and the classical X-ray bands, as well as at hard X-rays above 20 keV and at high-energy (>100 MeV) γ-rays. The other two young pulsars are the Crab and PSR B1509-58.
INTEGRAL/IBIS observations of a hard X-ray outburst in high-mass X-ray binary 4U 2206+54
Wang, W.
Aims: 4U 2206+54 is a wind-fed high-mass X-ray binary with a main-sequence donor star. The nature of its compact object has been recently identified as a slow-pulsation magnetized neutron star.
Methods: INTEGRAL/IBIS observations have a long-term hard X-ray monitoring of 4U 2206+54 and detected a hard X-ray outburst around 15 December 20…
Magnetic tension of sunspot fine structures
Tiwari, Sanjiv Kumar; Venkatakrishnan, P.
Context. The equilibrium structure of sunspots depends critically on its magnetic topology and is dominated by magnetic forces. Tension force is one component of the Lorentz force, which balances the gradient of magnetic pressure in force-free configurations.
Aims: We employ the tension term of the Lorentz force to clarify the structure of su…
XMMU J100750.5+125818: a strong lensing cluster at z = 1.082
Böhringer, H.; Pratt, G. W.; Rosati, P. +12 more
We report on the discovery of the X-ray luminous cluster XMMU J100750.5+125818 at redshift 1.082 based on 19 spectroscopic members. The cluster displays several strong lensing features. SED modeling of the lensed arc features from multicolor imaging with the VLT and the LBT reveals likely redshifts ~2.7 for the most prominent of the lensed backgro…
ARCRAIDER II: Arc search in a sample of non-Abell clusters
Schwope, A.; Schindler, S.; Erben, T. +2 more
Aims: We present a search for gravitational arcs in a unique sample of X-ray luminous, medium redshift clusters of galaxies.
Methods: The sample of clusters is called ARCRAIDER, is based on the ROSAT Bright Survey (RBS) and fulfils the following criteria: (a) X-ray luminosity ≥ 0.5 × 1045 erg/s (0.5-2 keV band), (b) redshift r…
Heavy water around the L1448-mm protostar
Codella, C.; Ceccarelli, C.; Bachiller, R. +5 more
Context. L1448-mm is the prototype of a low-mass Class 0 protostar driving a high-velocity jet. Given its bright H2O spectra observed with ISO, L1448-mm is an ideal laboratory to observe heavy water (HDO) emission.
Aims: Our aim is to image the HDO emission in the protostar surroundings, the possible occurrence of HDO emission also…
Soft band X/K luminosity ratios for gas-poor early-type galaxies
Bogdán, Á.; Gilfanov, M.
Aims: We aim to place upper limits on the combined X-ray emission from the population of steady nuclear-burning white dwarfs in galaxies. In the framework of the single-degenerate scenario, these systems, known as supersoft sources, are believed to be likely progenitors of Type Ia supernovae.
Methods: From the Chandra archive, we selecte…
A variable jet model for the Hα emission of HH 444
Raga, A. C.; Riera, A.; González-Gómez, D. I.
Context. HH 444 is one of the first Herbig-Haro (HH) jets discovered within a photoionized region.
Aims: We re-analyze the Hα and red [S II] HST images of HH 444, and calculate the width of the jet as a function of distance from the source. We compare the Hα image with predictions from variable ejection velocity jet models.
Methods: The …
Scattered Hα emission from a large translucent cloud G294-24
Juvela, M.; Lehtinen, K.; Mattila, K.
Aims: We study an undocumented large translucent cloud, detected by means of its enhanced radiation in the SHASSA (Southern H-Alpha Sky Survey Atlas) survey. We consider whether its excess surface brightness can be explained by light scattered off the dust grains in the cloud, or whether emission from in situ ionized gas is required. In addit…
Angular diameter estimation of interferometric calibrators. Example of λ Gruis , calibrator for VLTI-AMBER
Cruzalèbes, P.; Jorissen, A.; Bonneau, D. +1 more
Context. Accurate long-baseline interferometric measurements require careful calibration with reference stars. Small calibrators with high angular diameter accuracy ensure the true visibility uncertainty to be dominated by the measurement errors.
Aims: We review some indirect methods for estimating angular diameter, using various types of inp…