Search Publications
High-resolution absorption spectroscopy of the circumgalactic medium of the Milky Way
Richter, P.; Fox, A. J.; Bomans, D. +3 more
In this article we discuss the importance of high-resolution absorption spectroscopy for our understanding of the distribution and physical nature of the gaseous circumgalactic medium (CGM) that surrounds the Milky Way. Observational and theoretical studies indicate a high complexity of the gas kinematics and an extreme multi-phase nature of the C…
Long-slit échelle spectroscopy of galactic outflows: The case of NGC 4449
Weis, K.; Bomans, D. J.
At high redshift the ubiquity of outflows and winds in strongly star-forming galaxies has been demonstrated using rest frame UV absorption lines. In the cases with optical emission lines, the studies mostly had to rely on low and intermediate dispersion spectra. This implies that for detailed studies of galactic wind physics we have to use local o…
XMM-Newton publication statistics
Parmar, A. N.; Ness, J. -U.; Smith, R. +5 more
We assessed the scientific productivity of XMM-Newton by examining XMM-Newton publications and data usage statistics. We analyse 3272 refereed papers, published until the end of 2012, that directly use XMM-Newton data. The SAO/NASA Astrophysics Data System (ADS) was used to provide additional information on each paper including the number of citat…
Spectra of faint sources in crowded fields with FRODOSpec on the Liverpool Robotic Telescope
Goicoechea, L. J.; Shalyapin, V. N.
We check the performance of the FRODOSpec integral-field spectrograph for observations of faint sources in crowded fields. Although the standard processing pipeline L2 yields too noisy fibre spectra, we present a new processing software (L2LENS) that gives rise to accurate spectra for the two images of the gravitationally lensed quasar Q0957+561. …
The loss-limited electron energy in SN 1006: Effects of the shock velocity and of the diffusion process
Miceli, M.; Bocchino, F.; Decourchelle, A. +3 more
The spectral shape of the synchrotron X-ray emission from SN 1006 reveals the fundamental role played by radiative losses in shaping the high-energy tail of the electron spectrum. We analyze data from the XMM-Newton SN 1006 Large Program and confirm that in both nonthermal limbs the loss-limited model correctly describes the observed spectra. We s…
Observational dynamics of low-mass stellar systems
Frank, M. J.
The last fifteen years have seen the discovery of new types of low-mass stellar systems that bridge the gap between the once well-separated regimes of galaxies and of star clusters. Whether such objects are considered galaxies depends also on the definition of the term ``galaxy'', and several possible criteria are based on their internal dynamics …
Discussing the physical meaning of the absorption feature at 2.1 keV in 4U 1538-52
Torrejón, J. M.; Rodes-Roca, J. J.; Martínez-Nuñez, S. +2 more
High resolution X-ray spectroscopy is a powerful tool for studying the nature of the matter surrounding the neutron star in X-ray binaries and its interaction between the stellar wind and the compact object. In particular, absorption features in their spectra could reveal the presence of atmospheres of the neutron star or their magnetic field stre…
Inverse Compton origin of pulsar γ-ray emission and the reconnection model of Crab Nebula flares
Lyutikov, M.
There is growing evidence that the pulsar high-energy emission is generated by the inverse Compton effect. The particles producing the Crab nebula flares, and possibly most of the Crab Nebula's high-energy emission, are accelerated by reconnection events, and not by a shock according to the Fermi mechanism.
Science with Herschel: Results from the HERITAGE project
Roman-Duval, J.; Gordon, K.; Meixner, M. +2 more
The Herschel Space Observatory completed its last observation on 2013 April 29 after completing 35 000 astronomical observations resulting in numerous discoveries. In this review, we describe the capabilities and general scope of the Herschel mission. In particular, we review the science results from one of the open time key programs, the HERschel…
A phase-variable absorption feature in the X-ray spectrum of the magnetar SGR 0418+5729
Bignami, G. F.; Tiengo, A.; Götz, D. +9 more
An absorption feature, the properties of which strongly depend on the pulse phase, has been recently discovered in the X-ray spectrum of the soft gamma repeater SGR 0418+5729. If interpreted as a proton cyclotron line, its energy implies a magnetic field ranging from 2×1014 G to more than 1015 G, which confirms the magnetar i…