205 citations · 713 across the 18 of their papers we have counts for
18 papers
Probing magnetars magnetosphere through X-ray polarization measurements
Roberto Taverna, Fabio Muleri, Roberto Turolla +3
The study of magnetars is of particular relevance since these objects are the only laboratories where the physics in ultra-strong magnetic fields can be directly tested. Until now,…
A variable absorption feature in the X-ray spectrum of a magnetar
Andrea Tiengo, Paolo Esposito, Sandro Mereghetti +9
Soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are slowly rotating, isolated neutron stars that sporadically undergo episodes of long-term flux enhancement (out…
Pulse profiles from thermally emitting neutron stars
R. Turolla, L. Nobili
The problem of computing the pulse profiles from thermally emitting spots on the surface of a neutron star in general relativity is reconsidered. We show that it is possible to ext…
Modelling lightcurves and spectra of transient Anomalous X-ray Pulsars
S. Zane, A. Albano, R. Turolla +3
We present the first detailed joint modelling of both the timing and spectral properties during the outburst decay of transient anomalous X-ray pulsars. We consider the two sources…
The magnetar emission in the IR band: the role of magnetospheric currents
Silvia Zane, Luciano Nobili, Roberto Turolla
There is a general consensus about the fact that the magnetar scenario provides a convincing explanation for several of the observed properties of the Anomalous X-ray Pulsars and t…
Modeling the broadband persistent emission of magnetars
Silvia Zane, Roberto Turolla, Luciano Nobili +1
In this paper, we discuss our first attempts to model the broadband persistent emission of magnetars within a self consistent, physical scenario. We present the predictions of a sy…
An unified timing and spectral model for the Anomalous X-ray Pulsars XTE J1810-197 and CXOU J164710.2-455216
A. Albano, R. Turolla, G. L. Israel +3
Anomalous X-ray pulsars (AXPs) and soft gamma repeaters (SGRs) are two small classes of X-ray sources strongly suspected to host a magnetar, i.e. an ultra-magnetized neutron star w…
X-ray spectra from magnetar candidates - III. Fitting SGRs/AXPs soft X-ray emission with non-relativistic Monte Carlo models
S. Zane, N. Rea, R. Turolla +1
Within the magnetar scenario, the "twisted magnetosphere" model appears very promising in explaining the persistent X-ray emission from the Soft Gamma Repeaters and the Anomalous X…
Topology of magnetars external field. I. Axially symmetric fields
L. Pavan, R. Turolla, S. Zane +1
There is an increasing theoretical and observational evidence that the external magnetic field of magnetars may contain a toroidal component, likely of the same order of the poloid…
X-ray spectra from magnetar candidates. II Resonant cross sections for electron-photon scattering in the relativistic regime
L. Nobili, R. Turolla, S. Zane
Recent models of spectral formation in magnetars called renewed attention on electron-photon scattering in the presence of ultra-strong magnetic fields. Investigations presented so…
A Disk--Jet interaction model for the X--Ray Variability in Microquasars
Luciano Nobili
We propose a simple dynamical model that may account for the observed spectral and temporal properties of GRS 1915+105 and XTE J1550-5634. The model is based on the assumption that…
A Comptonization Model for Phase Lag Variability in GRS 1915+105
L. Nobili, R. Turolla, L. Zampieri +1
In this Letter we propose a simple thermal comptonization model to account for the observed properties of the phase lags associated to the ``plateau'' intervals of GRS 1915+105. By…
Dynamical Comptonization in spherical flows: black hole accretion and stellar winds
R. Turolla, S. Zane, L. Zampieri +1
The transport of photons in steady, spherical, scattering flows is investigated. The moment equations are solved analytically for accretion onto a Schwarzschild black hole, taking…
General relativistic radiative transfer in hot astrophysical plasmas: a characteristic approach
Silvia Zane, Roberto Turolla, Luciano Nobili +1
In this paper we present a characteristic method for solving the transfer equation in differentially moving media in a curved spacetime. The method is completely general, but its c…
On the Mathematical Character of the Relativistic Transfer Moment Equations
R. Turolla, L. Zampieri, L. Nobili
General--relativistic, frequency--dependent radiative transfer in spherical, differentially--moving media is considered. In particular we investigate the character of the different…
On the Nature of Photospheric Oscillations in Strong X--Ray Bursts
Iosif Lapidus, Luciano Nobili, Roberto Turolla
A possible sound origin for the photospheric oscillations in the X--ray bursting sources 1608-522 and 2127+119 is suggested. It is shown that standing sound waves in an expanding s…
Accretion Rates in X--Ray Bursting Sources
Iosif Lapidus, Luciano Nobili, Roberto Turolla
We present estimates for the accretion rates in 13 X--ray bursting sources which exhibit photospheric expansion, basing on theoretical models of stationary, radiatively driven wind…
Winds from Neutron Stars and Strong Type I X--Ray Bursts
Luciano Nobili, Roberto Turolla, Iosif Lapidus
A model for stationary, radiatively driven winds from X--ray bursting neutron stars is presented. General relativistic hydrodynamical and radiative transfer equations are integrate…