3HWC J1928+178 is one of the brightest Galactic gamma-ray sources detected byHAWCup to virgul56 TeV and potentially associated with one of the dozen PeVatron sourcesdiscovered by LHAASO.Given no apparent pulsar wind nebula or supernova remnant in the vicinity, theHAWC sourcestill remains unidentified. Recent X-ray and TeV observations as well as ourmulti-wavelength SED studypinned down the HAWC source to be either a PeVatron pulsar wind nebula, TeV haloor TeV gamma-ray binary. In particular, we found two X-ray counterpart candidates of the HAWC source - a variable X-ray source with a massive companion and putative diffuse X-ray emission. We propose a follow-up XMM observation of the X-ray counterpart candidates for determining the nature of this enigmatic HAWC source.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2022-09-25T23:52:27Z/2022-09-26T14:35:47Z
Version
20.08_20220509_1852
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr Kaya Mori, 2023, 'Is the HAWC source 3HWC J1928+178 a PeVatron PWN comma TeV halo or TeV binaryquestionMark', 20.08_20220509_1852, European Space Agency, https://doi.org/10.57780/esa-uufnqcg
