A dataset provided by the European Space Agency

Proposal ID 0820004
Obs ID 08200040001, 08200040002
Title The origin of X/gamma-ray emitting particles: cosmic-rays, antimatter and radioactivity in Cassiopeia A and Tycho
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0820004
DOI https://doi.org/10.57780/esa-i2hvodc
Author Martin
Abstract We propose to observe the Cassiopeia A and Tycho in order to constrain the production of various X/gamma-ray emitting particles by supernovae (SNe) and their remnants (SNRs). In AO-7, we argued that significant advances can be made with an additional 7Ms of exposure on these objects and we were granted 1.5Ms. We now require the continuation of the effort with a further 2Ms in AO-8. SNRs are established sources of cosmic-rays. A better characterisation thanks to IBIS of the hard X-ray spectra from both Cas A and Tycho will allow a better interpretation of the non-thermal emission from these objects. These observations are of great importance to constrain the maximum energy to which electrons are accelerated and the turbulent magnetic field and diffusion regime, two key ingredients of the diffusive shock acceleration theory. SNe and SNRs are also considered as the most likely sources of the galactic positrons, through the beta-decay of some of their nucleosynthesis products. It is still unclear which fraction of these positrons can escape SNe and SNRs to flow into the interstellar medium and feed the Galactic diffuse emission at 511keV observed with INTEGRAL. Constraining the 511keV emission from Cas A and Tycho with SPI will give valuable information about the positron escape fraction and transport, which are central to a full understanding of the leptonic antimatter content of our Galaxy. Stellar explosions also produce radioactive isotopes like 44Ti that upon decay give rise to gamma-ray line emission.The nucleosynthesis of 44Ti is highly sensitive to the physical conditions of the explosion. Observations with SPI and IBIS can help to identify at what location in the exploding star the 44Ti is produced and thus be a significant contribution to the understanding of the mechanisms by which stars explode. In addition to these topics, the Cassiopeia field harbours many hard X-ray sources to the study of which IBIS can strongly contribute.
Publications
Temporal Coverage 2011-01-11T13:10:22Z / 2011-08-17T13:22:43Z
Version 1.0
Mission Description The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
Creator Contact https://www.cosmos.esa.int/web/integral/helpdesk
Date Published 2025-03-25T09:54:36Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Martin, 2025, 'The origin of X/gamma-ray emitting particles: cosmic-rays, antimatter and radioactivity in Cassiopeia A and Tycho', 1.0, European Space Agency, https://doi.org/10.57780/esa-i2hvodc