A dataset provided by the European Space Agency

Proposal ID 0420008
Obs ID 04200080001, 04200080003, 04200080004
Title Massive Stars of Orion OB1 and the ISM
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0420008
DOI https://doi.org/10.57780/esa-bx99m65
Author Diehl
Abstract The Orion region hosts one of the most nearby regions of recent massive-star formation. COMPTELs measurement of 1809 keV emission from this region shows an interesting offset of the 26Al emission source from its likely sources, and appears rather extended. This suggests that radioactivity is displaced from its sources into the Eridanus cavity. If true, this opens unique possibilities to study the ISM near massive stars and the interaction of massive stars with their surroundings in a new way: Due to the proximity and location at the edge of a large cavity, we can compare locations of massive stars to the morphology of the ISM and the emission pattern of 26Al radioactivity, in order to constrain 26Al ejection in mass and velocity from massive stars. We aim to confirm and clarify the intensity and location of this nearby 26Al source with INTEGRAL. Furthermore, with these observations we can check for annihilation radiation, and for the intensity of nuclear deexcitation gamma-rays in the MeV range, both valuable diagnostics of the structure of superbubble interiors. It is important for INTEGRAL to assess the scientific potential of Orion region observations now; this will give us the option to eventually obtain unique measurements of ISM dynamics and massive stars as its driving engines within INTEGRALs lifetime there is hardly a more suitable and closeby target region.
Publications
Temporal Coverage 2006-09-27T00:56:07Z / 2008-03-09T02:18:44Z
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 2025-03-25T09:54:34Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Diehl, 2025, 'Massive Stars of Orion OB1 and the ISM', 1.0, European Space Agency, https://doi.org/10.57780/esa-bx99m65