Gamma-ray Bursts (GRBs) are the most powerful transients in the Universe, over–shining for a few seconds all other γ-ray sky sources. Their emission is produced within narrowly collimated relativistic jets launched after the core–collapse of massive stars or the merger of compact binaries. THESEUS will open a new window for the use of GRBs as cosmological tools by securing a statistically significant sample of high-z GRBs, as well as by providing a large number of GRBs at low–intermediate redshifts extending the current samples to low luminosities. The wide energy band and unprecedented sensitivity of the Soft X-ray Imager (SXI) and X-Gamma rays Imaging Spectrometer (XGIS) instruments provide us a new route to unveil the nature of the prompt emission. For the first time, a full characterisation of the prompt emission spectrum from 0.3 keV to 10 MeV with unprecedented large count statistics will be possible revealing the signatures of synchrotron emission. SXI spectra, extending down to 0.3 keV, will constrain the local metal absorption and, for the brightest events, the progenitors’ ejecta composition. Investigation of the nature of the internal energy dissipation mechanisms will be obtained through the systematic study with XGIS of the sub-second variability unexplored so far over such a wide energy range. THESEUS will follow the spectral evolution of the prompt emission down to the soft X–ray band during the early steep decay and through the plateau phase with the unique ability of extending above 10 keV the spectral study of these early afterglow emission phases.
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排序方式： 共有13条查询结果，搜索用时 31 毫秒
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F. Frontera A. Pisa G. Loffredo D. Pellicciotta V. Carassiti F. Evangelisti K. Andersen P. Courtois L. Amati E. Caroli T. Franceschini G. Landini S. Silvestri J. Stephen 《Experimental Astronomy》2005,20(1-3):241-251
A review of the HAXTEL project devoted to the development of a Laue lens telescope for hard X-/gamma-ray observation of the continuum spectra of celestial sources is presented. Main design properties, open issues, the status of the project and an example of multi-lens configuration with sensitivity expectations are discussed. 相似文献
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Ezio Caroli Natalia Auricchio Lorenzo Amati Yuriy Bezsmolnyy Carl Budtz-JøRgensen Rui M. Curado da Silva Filippo Frontera Alessandro Pisa Stefano Del Sordo John B. Stephen Giulio Ventura 《Experimental Astronomy》2005,20(1-3):341-351
The energy range above 60 keV is important for the study of many open problems in high energy astrophysics such as the role of Inverse Compton with respect to synchrotron or thermal processes in GRBs, non thermal mechanisms in SNR, the study of the high energy cut-offs in AGN spectra, and the detection of nuclear and annihilation lines. Recently the development of high energy Laue lenses with broad energy bandpasses from 60 to 600keV have been proposed for a Hard X ray focusing Telescope (HAXTEL) in order to study the X-ray continuum of celestial sources. The required focal plane detector should have high detection efficiency over the entire operative range, a spatial resolution of about 1mm, an energy resolution of a few keV at 500keV and a sensitivity to linear polarization. We describe a possible configuration of the focal plane detector based on several CdTe/CZT pixelated layers stacked together to achieve the required detection efficiency at high energy.
Each layer can operate both as a separate position sensitive detector and polarimeter or work with other layers to increase the overall photopeak efficiency. Each layer has a hexagonal shape in order to minimize the detector surface required to cover the lens field of view. The pixels would have the same geometry so as to provide the best coupling with the lens point spread function and to increase the symmetry for polarimetric studies. 相似文献
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Ghirlanda G. Salvaterra R. Toffano M. Ronchini S. Guidorzi C. Oganesyan G. Ascenzi S. Bernardini M. G. Camisasca A. E. Mereghetti S. Nava L. Ravasio M. E. Branchesi M. Castro-Tirado A. Amati L. Blain A. Bozzo E. O’Brien P. Götz D. Le Floch E. Osborne J. P. Rosati P. Stratta G. Tanvir N. Bogomazov A. I. D’Avanzo P. Hafizi M. Mandhai S. Melandri A. Peer A. Topinka M. Vergani S. D. Zane S. 《Experimental Astronomy》2021,52(3):277-308
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Households’ links with local Government provide important support for disaster resilience and recovery on the Bangladeshi coast. Few previous studies of disaster resilience and recovery have explored how linking social networks—and in particular local government—contribute. Using household surveys, focus groups, and key informant interviews, we examine strengths and weaknesses of local government’s contribution, using two cyclone-affected coastal villages as case studies. The findings show that local government provides important support, for example relief distribution, livelihood assistance, and reconstruction of major community services. However, patronage relationships (notably favouring political supporters) and bribery play a substantial role in how those responsibilities are discharged. The equity and efficiency of these contributions to recovery are markedly diminished by corruption. Reducing corruption in UP’s contributions to disaster recovery could significantly improve resilience; however, general reform of governance in Bangladesh would needed to bring this about. 相似文献
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Tanvir N. R. Le Floc’h E. Christensen L. Caruana J. Salvaterra R. Ghirlanda G. Ciardi B. Maio U. D’Odorico V. Piedipalumbo E. Campana S. Noterdaeme P. Graziani L. Amati L. Bagoly Z. Balázs L. G. Basa S. Behar E. De Cia A. Valle M. Della De Pasquale M. Frontera F. Gomboc A. Götz D. Horvath I. Hudec R. Mereghetti S. O’Brien P. T. Osborne J. P. Paltani S. Rosati P. Sergijenko O. Stanway E. R. Szécsi D. Tot́h L. V. Urata Y. Vergani S. Zane S. 《Experimental Astronomy》2021,52(3):219-244
Experimental Astronomy - At peak, long-duration gamma-ray bursts are the most luminous sources of electromagnetic radiation known. Since their progenitors are massive stars, they provide a tracer... 相似文献
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Amati L. O’Brien P.T. Götz D. Bozzo E. Santangelo A. Tanvir N. Frontera F. Mereghetti S. Osborne J. P. Blain A. Basa S. Branchesi M. Burderi L. Caballero-García M. Castro-Tirado A. J. Christensen L. Ciolfi R. De Rosa A. Doroshenko V. Ferrara A. Ghirlanda G. Hanlon L. Heddermann P. Hutchinson I. Labanti C. Le Floch E. Lerman H. Paltani S. Reglero V. Rezzolla L. Rosati P. Salvaterra R. Stratta G. Tenzer C. 《Experimental Astronomy》2021,52(3):183-218
Experimental Astronomy - THESEUS, one of the two space mission concepts being studied by ESA as candidates for next M5 mission within its Comsic Vision programme, aims at fully exploiting Gamma-Ray... 相似文献
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