On the high-energy emissions of compact objects observed with INTEGRAL SPI: Event selection impact on source spectra and scientific results for the bright sources Crab Nebula, GS2023+338 and MAXI J1820+070

Abstract

The INTEGRAL SPI instrument observes the hard X-ray sky from 20 keV up to a few MeV since more than 15 years. In this energy domain, the main emitters are compact objects for which SPI provides spectral information of prime interest. Recently, two transient sources reached very unusual flux levels and have been detected up to a few hundreds of keV with a high significance level. A drastic reduction of the systematic errors is thus required to obtain reliable spectra. This objective is achieved through an analysis including a detailed understanding of the instrument behavior. This paper presents both aspects of the data analysis: we first give a basic description of the instrumental issues, then we present the solution to be implemented in the SPI data analysis (at the event selection stage) and illustrate with a few examples the reliability of the SPI results in the high-energy domain when the data analysis is performed properly. We take benefit from this refined analysis procedure to propose an updated model of the hard X-ray spectral shape of the Crab Nebula. We revisit the high-energy emission observed in GS2023+338 spectra during its 2015 outburst and present the first results from the SPI observations dedicated to the recently discovered transient MAXI J1820+070.

References in corpus (2)

• When A Standard Candle Flickers
• Living on a Flare: Relativistic Reflection in V404 Cyg Observed by NuSTAR During its Summer 2015 Outburst

Cited by in corpus (18)

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• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• The INTEGRAL view on Black Hole X-ray Binaries
• Hybrid Comptonization and Electron-Positron Pair Production in the Black-Hole X-Ray Binary MAXI J1820+070
• Insight-HXMT, NuSTAR and INTEGRAL Data Show Disk Truncation in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• Potential origin of the state-dependent high-energy tail in the black hole microquasar Cygnus X-1 as seen with INTEGRAL
• Chasing the break: Tracing the full evolution of a black hole X-ray binary jet with multi-wavelength spectral modeling
• Detection of Small Flares from the Crab Nebula with Fermi-LAT
• A broadband view on microquasar MAXI J1820+070 during the 2018 outburst
• Black holes: Timing and spectral properties and evolution
• 2003-2018 Monitoring of the Crab Nebula Polarization in hard X-rays with INTEGRAL SPI
• Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst
• 2003-2019 Monitoring of the Crab emission through INTEGRAL SPI, or vice versa
• Gamma-ray observations of MAXI J1820+070 during the 2018 outburst
• Telescope Concepts in Gamma-Ray Astronomy
• MAXI J1535-571 2017 outburst Seen by INTEGRAL/SPI and Investigating the Origin of Its Hard Tail
• Improving INTEGRAL/SPI data analysis of GRBs
• In-flight calibration of the INTEGRAL/IBIS Compton mode: Application to the Crab Nebula polarization