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Global MHD simulation of flux transfer events at the high-latitude magnetopause observed by the Cluster spacecraft and the SuperDARN radar system
Daum, P.; Wild, J. A.; Penz, T. +5 more
A global magnetohydrodynamic numerical simulation is used to study the large-scale structure and formation location of flux transfer events (FTEs) in synergy with in situ spacecraft and ground-based observations. During the main period of interest on the 14 February 2001 from 0930 to 1100 UT the Cluster spacecraft were approaching the Northern Hem…
The Deep Lamp Project: An Investigation of the Precision and Accuracy of the Echelle Wavelength Scales of Space Telescope Imaging Spectrograph
Ayres, Thomas R.
The precision and absolute accuracy of the echelle mode wavelength scales of Space Telescope Imaging Spectrograph (STIS) are investigated. The method is to measure deep exposures of the onboard Pt/Cr-Ne hollow cathode calibration lamp. The standard deviation of emission spots from their laboratory wavelengths in a single image is a measure of the …
XMM-Newton observations of the Small Magellanic Cloud: RX J0105.9-7203, a 726 s Be/X-ray binary pulsar
Haberl, F.; Eger, P.
Aims: To investigate the Be/X-ray binary candidate RX J0105.9-7203 in the Small Magellanic Cloud (SMC), we analysed twenty-two archival XMM-Newton observations around the calibration target 1E 0102.2-7218.
Methods: We performed spectral and temporal analyses on the EPIC data of fifteen observations. We disregarded the data of one observation d…
A new search strategy for microquasar candidates using NVSS/2MASS and XMM-Newton data
Combi, J. A.; Martí, J.; Albacete-Colombo, J. F.
Aims:Microquasars are ideal natural laboratories for understanding accretion/ejection processes, studying the physics of relativistic jets, and testing gravitational phenomena. Nevertheless, these objects are difficult to find in our Galaxy. The main goal of this work is to increase the number of known systems of this kind, which should allow bett…
Locating the solar source of 13 April 2006 magnetic cloud
van Driel-Gesztelyi, L.; Owen, C. J.; Démoulin, P. +5 more
Using Advanced Composition Explorer (ACE) in situ data we identify and describe an interplanetary magnetic cloud (MC) observed near Earth on 13 April 2006. We also use multi-instrument and multi-wavelength observations from the Solar and Heliospheric Observatory (SOHO), the Transition Region and Coronal Explorer (TRACE) and ground-based solar obse…
The properties of the putative pulsar associated with IGR J18135-1751/HESS J1813-178
Hill, A. B.; Dean, A. J.
Context: We investigate the possible theoretical properties of the putative pulsar associated with the pulsar wind nebula IGR J18135-1751/HESS J1813-178 based upon recent γ-ray observations and archival multi-wavelength observations.
Aims: We show that when using the standard equations for magnetic dipole radiation with recent soft γ-ray obser…
A multi-coloured survey of NGC 253 with XMM-Newton: testing the methods used for creating luminosity functions from low-count data
Kolb, U.; Barnard, R.; Greening, L. Shaw
NGC 253 is a local, starbursting spiral galaxy with strong X-ray emission from hot gas, as well as many point sources. We have conducted a spectral survey of the X-ray population of NGC 253 using a deep XMM-Newton observation. NGC 253 only accounts for ~20 per cent of the XMM-Newton EPIC field of view, allowing us to identify ~100 X-ray sources th…
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…