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Search for Nonthermal X-ray Emission in the Ophiuchus Galaxy Cluster

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Abstract

We present the results of our study of the X-ray emission from the Ophiuchus galaxy cluster based on INTEGRAL/IBIS data in the energy range 20–120 keV. Our goal is the search for a nonthermal emission component from the cluster. Using the INTEGRAL data over the period of observations 2003–2009, we have constructed the images of the Ophiuchus galaxy cluster in different energy bands from 20 to 120 keV with the extraction of spectral information. We show that in the hard X-ray energy band the source is an extended one with an angular size of \(4.9^{\prime}\pm 0.1^{\prime}\). Assuming a fixed intracluster gas temperature of 8.5 keV, a power-law component of the possible nonthermal X-ray emission is observed at a 5.5\(\sigma\) significance level, the flux from which is consistent with previous studies. However, in view of the uncertainty in constraining the thermal emission component in the X-ray spectrum at energies above 20 keV, we cannot make the assertion about a significant detection of nonthermal emission from the cluster. Based on the fact of a confident detection of the cluster up to 70 keV, we can draw the conclusion only about the possible presence of a nonthermal excess at energies above 60 keV.

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Notes

  1. Nevertheless, it should be noted that the assumption about a fixed cluster temperature is a strong one. A mixture of gas phases with temperatures from 1 to 11 keV is known to be present in the central region of the cluster (Werner et al. 2016).

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ACKNOWLEDGMENTS

I am grateful to S.Yu. Sazonov, A.A. Vikhlinin, and E.M. Churazov for the recommendations to improve the paper. This work is based on observations with the INTEGRAL gamma-ray observatory, the ESA project with the instruments and the science data center funded by the ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, and Spain) and Poland, with the participation of Russian and USA. This work was supported by the Russian Science Foundation within scientific project no. 19-12-00396.

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  1. Space Research Institute, Russian Academy of Sciences, 117997, Moscow, Russia

    R. A. Krivonos

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Translated by V. Astakhov

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Krivonos, R.A. Search for Nonthermal X-ray Emission in the Ophiuchus Galaxy Cluster. Astron. Lett. 48, 636–643 (2022). https://doi.org/10.1134/S1063773722110135

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