|Title||Non-forward shock components in X-ray afterglows|
|Author||Dr Massimiliano De Pasquale|
|Description||In the Forward Shock (FS) model, the GRB afterglow is produced in the circumburst medium when the ejecta interacts with it. However, a few GRBs have an X-ray lightcurve with a very large change of decay slope, that is hard to explain by a FS, while their optical behaviour is different and more consistent with it. One proposed solution is that X-ray emission is produced within the ejecta, and ends in a few ks. We propose to test this scenario by observing at late epochs 2 GRBs with a large break in the X-ray lightcurve and detected optical afterglow with XMM-Newton. In this model, the X-ray flux at late epochs should return to a shallower decay, similar to the optical, when the emission from the FS prevails. XMM-Newton high sensitivity is required to constrain the X-ray flux at late times.|
|Publication||XMM-Newton publication statistics . Ness, J.-U., Parmar, A. N., et all. . AN . 335-210 . 2014 . 2014AN....335..210N ,
The 80 Ms follow-up of the X-ray afterglow of GRB 130427A challenges the standard forward shock model . De Pasquale, M., Page, M. J., et all. . MNRAS . 462-1111 . 2016 . 2016MNRAS.462.1111D ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Dust scattering X-ray expanding rings around gamma-ray bursts . Mereghetti, S., Tiengo, A., . NCimB . 121-1111 . 2006 . 2006NCimB.121.1111M ,
AGN spectral states from simultaneous UV and X-ray observations by XMM-Newton . Svoboda, J., Guainazzi, M., . A&A . 603-127 . 2017 . 2017A&A...603A.127S ,
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2014-07-03T00:00:00Z, 069338, 17.56_20190403_1200. https://doi.org/10.5270/esa-vh51ryu|