A dataset provided by the European Space Agency

Proposal ID 0740009
Obs ID 07400090007
Title INTEGRAL TOO observations of a Seyfert 2 galaxy during a period of high flux
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0740009
DOI https://doi.org/10.57780/esa-oavmvwl
Author Williams
Abstract There have been few dedicated observations of Seyfert 2 galaxies by INTEGRAL. However, it is at hard X-ray energies that absorption becomes less important and observations can potentially reveal the emission from the close environment of the central black hole. Unfortunately there are few Seyfert 2 galaxies persistently bright enough to justify the long INTEGRAL observations required. We request therefore an INTEGRAL TOO observation of a Seyfert 2 galaxy during a period when the 10-200 keV flux is above 25 mCrab. A second observation when the source has returned to its normal state is also requested to allow the study of correlation between the various spectral components.The principle motivation of the observation is a measurement of the high energy cut-off. Curvatures at high energies can be due to either a reflection component or an exponential cut-off. Comparisons with other Seyfert 2 observations show that 25 mCrab in the 15-50 keV band is bright enough to allow a measurment of the cut-off up to ~150 keV in 200 ksec. A cut-off energy in a Seyfert 2 has been found at energies as low as 50 keV (Circinus) using INTEGRAL data, although in the Seyfert 2 best studied by INTEGRAL (NGC 4388), the cut-off was either absent or at enegies above 200 keV. Measurement of a Seyfert 2 while it is temporarily in a high flux state gives us perhaps the best chance of measuring another cut-off energy in a Seyfert 2 galaxy with INTEGRAL.
Publications
Temporal Coverage 2010-07-19T02:02:23Z / 2010-07-21T18:38:11Z
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 2026-03-05T13:05:57Z
Keywords INTEGRAL gamma-ray data, ESA INTEGRAL mission dataset, gamma-ray astronomy observations, high-energy astrophysics data, IBIS imaging data, SPI spectrometer data, JEM-X X-ray monitoring data, OMC optical monitoring data, coded mask telescope observations, gamma-ray spectroscopy dataset, MeV astrophysics data, keV–MeV photon observations, gamma-ray burst observations dataset, black hole gamma-ray data, neutron star high-energy observations, positron annihilation 511 keV line data, Galactic Center gamma-ray emission dataset, supernova nucleosynthesis gamma-ray lines, active galactic nuclei high-energy data, transient astrophysical source monitoring, calibrated photon event lists, gamma-ray light curves, high-energy spectra data, sky maps gamma-ray, time-series astrophysical observations, long-term gamma-ray monitoring dataset
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Williams, 2026, 'INTEGRAL TOO observations of a Seyfert 2 galaxy during a period of high flux', 1.0, European Space Agency, https://doi.org/10.57780/esa-oavmvwl