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Microquasars within the Milky Way, like V4641 Sagittarii, have been discovered to emit photons with energy levels previously attributed only to distant quasars. This revelation from the HAWC observato...

The center of our galaxy offers a unique window into how cosmic rays are accelerated to extremely high energies. This region contains a large amount of dense gas and potential accelerators, including…

Microquasars have long been recognized as powerful particle accelerators within our galaxy. The recent breakthrough by HAWC, marking the first detection of ultra-high-energy gamma rays from a microquasar with photon energies exceeding 200 TeV, reveals that microquasars like V4641 Sgr could significantly contribute to the Galactic cosmic ray spectrum up to PeV energies. This discovery suggests that large-scale jets from microquasars may be more common and impact than previously believed, reinforcing their role as smaller analogs of active galactic nuclei (AGN). The origin of the detected gamma rays may stem from proton interactions with ambient gas or from electrons up-scattering photons, although the leptonic scenario is challenged by their rapid energy loss at high energies. Additionally, the study shows the continuous advantages of wide-field observatories like HAWC in detecting large-scale gamma-ray emissions, providing new insights into particle acceleration in extreme environments.

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Nicholas Kristof exposed systemic Israeli r-pe of Palestinian prisoners. Now, a coordinated Israeli media campaign seeks to discredit his work.

Observatory research points to extreme cosmic accelerator as source of galactic cosmic rays

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