Search Publications
Quasar host galaxies in the FORS deep field
Nilsson, K.; Villforth, C.; Heidt, J.
Context: The evolution of quasar host galaxies is still hardly studied at high redshifts (z>2), although this is a very interesting redshift range as both the quasar activity and the star formation rate density have their peak at z≈ 2{-}3. This makes it especially interesting to study properties of quasar host galaxies, such as the star formati…
Weak localization of electromagnetic waves and radar polarimetry of Saturn's rings
Mishchenko, Michael I.; Dlugach, Janna M.
We use a state-of-the-art physics-based model of electromagnetic scattering to analyse average circular polarization ratios measured for the A and B rings of Saturn at a wavelength of 12.6 cm. This model is directly based on the Maxwell equations and accounts for the effects of polarization, multiple scattering, weak localization of electromagneti…
The enigmatic young object: Walker 90/V590 Monocerotis
McCollum, B.; van den Ancker, M. E.; Joner, M. D. +1 more
Aims: We assess the evolutionary status of the intriguing object Walker 90/V590 Mon, which is located about 20 arcmin northwest of the Cone Nebula near the center of the open cluster NGC 2264. This object, according to its most recent optical spectral type determination (B7), which we confirmed, is at least 3 mag too faint in V for the cluster dis…
Infrared study of infrared carbon stars based on 2MASS, IRAS and ISO SWS data
Chen, Pei-Sheng; Shan, Hong-Guang
For this paper, we collected all infrared carbon stars (IRCSs) known so far from the literature and identified the 2MASS counterparts of all IRCSs. Using 2MASS, IRAS and ISO SWS data, we investigate the infrared properties of IRCSs. We find that the infrared colors and temperatures of IRCSs—not only in the IRAS region but also in the near infrared…
Detection of X-Ray Elongated Emission from AN Ultraluminous X-Ray Source in the Interacting Pair of Galaxies NGC 5953/5954
Ghosh, Kajal K.; Rosado, Margarita; Fuentes-Carrera, Isaura
We present radio through X-ray observations of a bright (>1040 erg s-1 in the 0.5-8.0 keV band) ultraluminous X-ray source (ULX), CXOU J153434.9+151149, in the starburst, interacting pair of galaxies NGC 5953/5954. A Chandra image of this ULX shows that it is elongated. From HST/WFPC2/F606W data we have detected a counterp…
Reciprocal Vectors
Vogt, Joachim; Paschmann, Gotz; Chanteur, Gérard
Reciprocal vectors and barycentric coordinates are well-established concepts in various scientific fields, where lattices and grids are essential, e.g., in solid state physics, crystallography, in the numerical analysis of partial differential equations using finite elements, and also in computer graphics and visualisation. In preparation of the C…
XMM-Newton observations of the low-mass X-ray binary XB 1832-330 in the galactic globular cluster NGC 6652
Parmar, A. N.; Sidoli, L.; La Palombara, N. +1 more
Context: We report on two XMM-Newton observations performed in 2006 of the luminous low-mass X-ray binary XB 1832-330, which is located in the galactic globular cluster NGC 6652 and is probably an ultracompact binary (orbital period, P_orb, of <1 h).
Aims: The aim of these observations is to investigate the low-energy absorption towards XB …
Diagnostics of inhomogeneous stellar jets. Convolution effects and data reconstruction
Raga, A. C.; Del Burgo, C.; de Colle, F.
Context: In the interpretation of stellar jet observations, the physical parameters are usually determined from emission line ratios, obtained from spectroscopic observations or using the information contained in narrow band images. The basic hypothesis in the interpretation of the observations is that the emitting region is homogeneous along the …
Spatial Extension in the Ultraviolet Spectrum of VV Cephei
Bennett, Philip D.; Gull, Theodore R.; Hagen Bauer, Wendy
Two-dimensional processing of Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) echelle spectra of the eclipsing M2 Iab + B binary system, VV Cep, has revealed extended emission in all 21 epochs observed, ranging from midtotality through the first quadrature. In the ultraviolet accessible to STIS (1150- 3150 Å), essentially al…
Sunward propagating Pc5 waves observed on the post-midnight magnetospheric flank
Glassmeier, K. -H.; Blomberg, L. G.; Schaefer, S. +1 more
The overall focus on the driver of toroidal Pc5 waves has been on processes located at or acting on the dayside magnetopause and dayside flanks of the magnetosphere. These processes can generate waves that propagate tailward in the magnetosphere. However, an increasing number of studies, both theoretical and experimental, have looked at waves prop…