ESA Science & Technology - Publication Archive
- 5th Announcement of Opportunity (AO-5)
- Key Programmes in AO-5
- Science Highlights
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- The Fastest INTEGRAL TOO
- ISOC Science Data Archive Version 2.7
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http://www.rssd.esa.int/index.php?project=XEUS&page=SPIE_DocumentsThis note provides a brief overview of critical issues and some recent updates since the publication of the above papers.
The purpose of this preliminary payload resources document is to translate the typical science requirements into a payload resource budget, which is required for the first part of the system design of the Cross-scale TRS.
The document is (currently) an open document and regular updates, primarily refinements, are expected. Particularly, iterative steps with industrial study partners and the ESA TRS study manager are foreseen. Revisions will be published, as required, at the start of as well as during the system design. This document will be evolved into a straw man Payload Definition Document.
The purpose of the mission requirements document is to provide level 1 (mission) requirements for the Cross-scale TRS system design study.
- Formation and evolution of stars
- Formation of planetary systems and planet detection
- Formation and evolution of galaxies
- To assess the feasibility of a far-infrared Michelson interferometer based on a single spacecraft
- To design the mission
- To identify the critical technologies and define their development plan
- To make cost, risk and programmatics analysis for the mission and for the technology development plan
- a Phase 1 devoted to requirements review and architecture trade-of: it has led to the selection of the non planar arrangement
- a Phase 2 devoted to preliminary design: together with the consolidation of the selected arrangement, it has produced the payload and spacecraft preliminary design, including performance budgets
Aims. Only a small number of these type of events have been observed and confirmed to date. The discovery of more cases would allow a number of fundamental conclusions to be drawn about properties such as the frequency of tidal disruption events, the distribution of quiescent black hole masses and their influence in the context of galaxy/AGN formation and evolution among others.
Methods. Comparing the XMM-Newton Slew Survey Source Catalogue with the ROSAT PSPC All-Sky Survey five galaxies have been detected a factor of up to 88 brighter in XMM-Newton with respect to ROSAT PSPC upper limits and presenting a soft X-ray colour. X-ray luminosities of these sources derived from slew observations have been found in the range 1041-1044 erg s-1, fully consistent with the tidal disruption model. This model predicts that during the peak of the outburst, flares reach X-ray luminosities up to 1045 erg s-1, which is close to the Eddington luminosity of the black hole, and afterwards a decay of the flux on a time scale of months to years is expected. Multi-wavelength follow-up observations have been performed on these highly variable objects in order to disentangle their nature and to investigate their dynamical evolution.
Results. Here we present sources coming from the XMM-Newton Slew Survey that could fit in the paradigm of tidal disruption events. X-ray and optical observations revealed that two of these objects are in full agreement with that scenario and three other sources that, showing signs of optical activity, need further investigation within the transient galactic nuclei phenomena.
This article is based on a multimedia presentation prepared by Rudolf von Steiger, Professor at the University of Bern and Director of the International Space Science Institute together with Thomas H. Zurbuchen, Associate Professor at the University of Michigan.