Issue |
A&A
Volume 690, October 2024
|
|
---|---|---|
Article Number | A142 | |
Number of page(s) | 6 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361/202451018 | |
Published online | 04 October 2024 |
Search of extended emission from HESS J1702-420 with eROSITA
1
Institut für Astronomie und Astrophysik Tübingen, Universität Tübingen, Sand 1, D-72076 Tübingen, Germany
2
School of Physical Sciences and Centre for Astrophysics & Relativity, Dublin City University, Glasnevin D09 W6Y4, Ireland
3
Dublin Institute for Advanced Studies, School of Cosmic Physics, 31 Fitzwilliam Place, Dublin 2, Ireland
4
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
5
Yerevan State University, 1 Alek Manukyan St, Yerevan 0025, Armenia
Received:
7
June
2024
Accepted:
23
July
2024
Context. HESS J1702-420 is a peculiar TeV complex with a morphology changing from a diffuse source (HESS J1702-420B) at ≲2 TeV to a point-like one (HESS J1702-420A) at ≳10 TeV energies. The morphology and spectral properties of HESS J1702-420 could be understood in terms of (diffusive) hadronic or leptonic models in which the observed TeV emission arises correpondingly from proton-proton or IC-radiation of relativistic particles present in the region.
Aims. In this work, we perform searches of the X-ray counterpart of the HESS J1702-420B source originating from the synchrotron emission of the primary or secondary relativistic electrons produced within leptonic or hadronic models. Such an emission can be extended and remain beyond the detection capabilities of narrow field-of-view instruments such as XMM-Newton.
Methods. We utilised the publicly available first-6-months eROSITA dataset (DR1) fully covering the selected analysis region of > 5°-radius around HESS J1702-420. We discuss biases connected to variable plasma temperature or neutral hydrogen column density in the region and present results based on the background modelling approach.
Results. The performed analysis does not allow us to detect the extended X-ray counterpart of HESS J1702-420 of 0.07° −3°-radii sizes. The derived upper limits are significantly higher than the expected hadronic model flux of the X-ray counterpart. For the leptonic model, the derived limits indicate the magnetic field in the region B ≲ 2 μG. We argue that further advances in the diffuse X-ray counterpart searches could be achieved with either next-generation missions or Msec-long observational campaigns using currently operating instruments.
Key words: diffusion / X-rays: individuals: HESS J1702-420
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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