Talk detail

Participant	Esposito, Paolo
Institution	INAF-IASF Milano - via E. Bassini 15 - Milano - Lombardy - Italy

Session	SF1	Accepted	Yes	Order	1	Time	30'
Talk	Oral abstract	Title	Recent results on magnetars
Co-authors
Abstract	Anomalous X-ray pulsars and soft gamma-ray repeaters have a number of common properties, including long spin periods, large spin-down rates, relatively bright and variable X-ray luminosities, and the emission of powerful bursts. All these sources are now generally regarded as manifestations of ultra-magnetised neutron stars and for this reason are often collectively referred to as magnetars. The intense observational effort that has been devoted to magnetars in recent years is unveiling many unpredicted and surprising properties of these sources. This wealth of observational data challenges the theoretical models and impacts our view of the isolated neutron stars in general. I will review the most recent results.

Session	SO3	Accepted	No	Order		Time
Talk	Poster abstract	Title	Swift monitoring of the candidate supergiant fast X-ray transient IGR J16418 −4532
Co-authors	P. Romano (INAF-IASF Palermo), L. Ducci (U. Tubingen), V. Mangano (INAF-IASF Palermo), S. Vercellone (INAF-IASF Palermo)
Abstract	Supergiant Fast X-ray Transients (SFXTs) are a class of HMXBs with OB supergiant companions. The hallmark of SFXTs is the occurrence of short (a few hours) outbursts during which the luminosity can increase by 3-5 orders of magnitude, up to about 1E37 erg/s. Either clumps in the inflowing wind or a gating mechanism have been suggested to be responsible for the outbursts. After its discovery in 2003, IGR J16418-4532 -for which both the orbital (3.7d) and spin (1.2ks) periods are known- has been tentatively classified as a SFXT. In 2011 Swift observed IGR J16418 several times, covering three orbital periods. The data of this monitoring allowed us to confirm SFXT nature of the source. Moreover, we show that the X-ray emission from IGR J16418 can be explained in terms of the accretion from a spherically symmetric clumpy wind, with clumps of masses from 1E16 to 1E21 g.

Session	SO3	Accepted	No	Order		Time
Talk	Poster abstract	Title	Numerical Solution of the Radiative Transfer Problem for Accreting Matter onto Magnetized Compact Objects: Application to Supergiant Fast X-ray Transients
Co-authors	C. Ceccobello (INFN Ferrara), R. Farinelli (U. Ferrara), P. Romano (INAF-IASF Palermo), L. Titarchuk (U. Ferrara), V. Mangano (INAF-IASF Palermo)
Abstract	We have developed an algorithm based on relaxation techniques aimed at solving radiative transfer equations in Fokker-Planck (diffusion) approximation when both thermal and bulk Comptonization contribute to the spectral formation process. In particular, we applied the algorithm to the case of a cylindrical accretion column of matter falling onto the polar caps of a magnetised compact object. The algorithm is going to be implemented in the XSPEC package for X-ray spectral fitting as the contributed model COMPMAG. We show the results of the first application of this model to the two SFXT prototypes, XTE J1739-302 and IGR J17544-2619, which triggered the Swift/BAT on 2011 February 22 and March 24, respectively. We fitted the broad-band spectrum of those exceptionally bright outbursts comparing several phenomenological and physical models, including COMPMAG.

Session	SO5	Accepted	Yes	Order	99	Time
Talk	Poster abstract	Title	LOFT - the Large Observatory For X-ray Timing
Co-authors	Enrico Bozzo (ISDC/University of Geneva), Patrizia Romano (INAF-IASF Pa)
Abstract	LOFT (the Large Observatory for X-ray Timing) is one of the four candidate ESA M3 missions competing for a launch opportunity at the start of the 2020s. It is specifically designed to perform fast X-ray timing and probe the status of the matter near black holes and neutron stars. The LOFT scientific payload is composed of a Large Area Detector (LAD) and a Wide Field Monitor (WFM). The LAD is a pointed instrument operating in the energy range 2-80 keV and characterized by an effective area reaching ~10 m2 at 8 keV, an energy resolution of ~260 eV at 6 keV and a time resolution <10 ms. The WFM has the main scope of catching good triggering sources to be pointed with the LAD. The brightest events will trigger the on-board LOFT Burst Alert System (LBAS), able to broadcast the event position and trigger time within ~30 seconds to the ground. The corresponding WFM fine spectral (~300 eV) and high timing resolution (~10 microsec) data will be made available on the ground within a few hours from the discovery.