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Abstract: In this talk, I discuss recent results from a joint analysis of the high-energy neutrino emission observed from the Galactic Plane by IceCube and the diffuse ultra-high-energy gamma-ray emission measured by LHAASO. We compare this data to models that include diffuse emission from cosmic-ray interactions in the interstellar medium, unresolved TeV halos, and unresolved Galactic neutrino sources. We find that the gamma-ray emission can be explained by a combination of diffuse processes and unresolved TeV halos. The observed neutrino emission cannot be generated by cosmic-ray interactions in the interstellar medium alone, but requires contributions from one or more unresolved source populations. Across a wide range of assumptions about Galactic cosmic-ray transport, we find that Galactic neutrino sources contribute significantly to the neutrino flux observed from the Galactic Plane and are likely responsible for most of this emission.
- 21.08. Vaso Pavlidou and Kostas Tassis (University of Crete): TBA
- PASIPHAE and the Milky Way atlas it will enable. Friday 10:30
Abstract: More than just our cosmic “you are here” dot, the Milky Way is the environment that gave rise to the solar system, the Earth, and life itself, as well as the lens through which we obsere the Universe at large. The 3D structure of our Galaxy is an ever-present veil, which distorts our view of both distant galaxies and the early Universe. Combining latest and upcoming astronomical data with algorithms drawing from information field theory, our team is creating a self-consistent, uncertainty-aware 3D map of all Galactic components: the mw-atlas. Central to this reconstruction will be new data from PASIPHAE: an optopolarimetric survey aiming to measure the linear polarization from millions of stars. These, together with stellar distances from Gaia, can be combined to probe tomographically the magnetic field threading dust clouds within the Milky Way. 3D Galacic magnetic field maps enabled by PASIPHAE will provide invaluable information for future CMB B-mode experiments, for the physics of the interstellar medium and star formation, and for the propagation of cosmic rays through the Galaxy.