Search Publications
Magnetic fields in Neutron Stars
Rea, N.; Pons, J. A.; Miralles, J. A. +1 more
Isolated neutron stars show a diversity in timing and spectral properties, which has historically led to a classification in different sub-classes. The magnetic field plays a key role in many aspects of the neutron star phenomenology: it regulates the braking torque responsible for their timing properties and, for magnetars, it provides the energy…
An XMM-Newton view of FeKα in High Mass X-rays Binaries
Eikmann, W.; Oskinova, L. M.; Torrejón, J. M. +4 more
We present a comprehensive analysis of the whole sample of available XMM-Newton observations of High Mass X-ray Binaries (HMXBs) until August, 2013, focusing on the FeKα emission line. This line is a key tool to better understand the physical properties of the material surrounding the X-ray source within a few stellar radii (the circumstellar medi…
Ice processes and organic matter in space: observations and laboratory simulations
Martín-Doménech, R.; Muñoz Caro, G. M.
The formation of ice mantles on interstellar and circumstellar dust grains is governed by the accretion and desorption processes. Thermal processing of astrophysical ices takes place in circumstellar environments, near protostars, or already formed stars (comets and other icy bodies). Temperature-programmed desorption experiments of ice composed o…
X-ray spectral variability of low ionization nuclear emission line regions (LINERs)
González-Martín, O.; Márquez, I.; Masegosa, J. +1 more
Although variability is a general property of AGN, and in LINERs variations in timescales of months/years have been found for some objects, it is not clear how these changes occur. The main purpose of this work is to investigate the X-ray variability in LINERs, including the main driver of such variations. We use the 18 LINERs in the Palomar sampl…
Discordant optical and X-ray classification of AGN
Carrera, F. J.; Wiersema, K.; Mateos, S. +1 more
To provide insight into the apparent mismatch between the optical and X-ray absorption properties observed in 10--30 % of Active Galactic Nuclei (AGN), we have conducted a detailed study of two X-ray unabsorbed AGN with a type-2 optical spectroscopic classification. In addition to high quality X-ray spectroscopic observations, that we used to dete…