Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 513, Issue 2, Pages 2884-2892Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac711
Keywords
pulsars: general; ISM: magnetic fields; X-rays: ISM
Categories
Funding
- National Key R&D Program of China [2018YFA0404203]
- NSFC [12121003, 11625312, U2031105]
- Russian Space Agency (Roskosmos)
- Deutsches Zentrum fur Luft- und Raumfahrt (DLR)
- DLR
- Max Planck Society
- European Research Council (ERC) under the European Union [865637]
- European Research Council (ERC) [865637] Funding Source: European Research Council (ERC)
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It has been discovered that halo-like structures may be common around middle-aged pulsars. By observing the gamma-ray and X-ray emissions from these halo regions, the magnetic field and diffusion coefficient in the pulsars can be inferred. Using the eROSITA telescope, most of the X-ray haloes can be detected in a specific energy range, allowing for detailed measurements of their surface brightness profiles.
The detection of extended TeV gamma-ray emission (dubbed 'TeV haloes') around Geminga and Monogem pulsars by High Altitude Water Cherenkov collaboration implies that the halo-like morphologies around middle-aged pulsars may be common. The gamma-ray emission above 10 TeV is thought to arise from inverse Compton scattering of relativistic electrons/positrons in the pulsar haloes off cosmic microwave background photons. In the meanwhile, these electrons and positrons can produce X-ray synchrotron emission in the interstellar magnetic field, resulting in a diffuse emission in the X-ray band (namely X-ray haloes). Here, we study the prospect of detecting X-ray haloes with extended Roentgen Survey with an Imaging Telescope Array (eROSITA) from 10 middle-aged pulsars with characteristic age tau(c) larger than tens of thousands of years in the Australia Telescope National Facility pulsar catalogue. Assuming a benchmark value (i.e. B = 3 mu G) for the magnetic field, most of the X-ray haloes are found to be bright enough to be detected by eROSITA in the energy range of 0.5-2 keV with a 20 ks targeted survey. Among these pulsar haloes, four are detectable in the ongoing 4-yr eROSITA all-sky survey. Thanks to the large grasp in the soft X-ray band, eROSITA is expected to be able to measure the surface brightness profiles of the X-ray haloes from sub-pc up to tens of pc scales, which can be used to constrain the magnetic field and the diffusion coefficient in the pulsar haloes.
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