IceCube has not yet found neutrino sources within our galaxy, but there may be sources that are not too much farther out. To test this possibility, the IceCube Collaboration recently performed an analysis scouring the local universe for potential neutrino sources. They conducted two different searches that looked for correlations between neutrino emission and dense regions in a catalog of galaxies called the 2MASS Redshift Survey (2MRS). While they did not find significant sources, they were able to put constraints on neutrino emission from nearby galaxies, which they present in a paper recently submitted to the Journal of Cosmology and Astroparticle Physics. […]
Research
Putting neutrino masses in their place (soon!) with the IceCube Upgrade and JUNO
Neutrino mass ordering is one of the foremost problems in neutrino physics today. But two new neutrino oscillation experiments are on the horizon—the IceCube Upgrade and JUNO. So the IceCube Collaboration and the JUNO Collaboration studied the combined performance of their respective experiments, which employ very distinct and complementary routes in order to resolve the neutrino mass ordering. In a paper submitted recently to Physical Review D, they show that a combined analysis could eliminate the wrong mass ordering in as few as three years from the start of data taking. […]
What can cascade events tell us about neutrino sources?
Cascade events are more difficult to reconstruct than tracks, which are usually used in searches for astrophysical neutrino sources, but cascades have their own advantages, including providing a better measurement of neutrino energy. In a paper published in The Astrophysical Journal, the IceCube Collaboration outlined recent results from a source search that used seven years of data from cascade events. While they did not find any statistically significant sources of neutrino emissions, this work is an improvement on the previous source search with cascades. […]
New measurements of cosmic ray spectra and composition from IceCube and IceTop
In a paper recently published in Physical Review D, the IceCube Collaboration reports on measurements of the all-particle cosmic ray energy spectrum and composition in the PeV to EeV energy range using three years of data from the IceCube Neutrino Observatory. […]
IceCube and PICO set new constraints on properties of dark matter particles
Dark matter is one of the biggest mysteries in modern astronomy and physics. In a paper recently submitted to the European Physical Journal C, scientists from IceCube and PICO determined new constraints on particle physics properties of dark matter. Though these are less stringent than previous constraints, they take into consideration the latest research on the distribution of dark matter in our galaxy. […]
New all-sky search reveals potential neutrino sources
After 10 years of searching for origins of astrophysical neutrinos, a new all-sky search provides the most sensitive probe of time-integrated neutrino emission of point-like sources. The IceCube Collaboration presents the results of this scan in a paper submitted today to Physical Review Letters. […]
Testing a new technique to search for neutrino point-source populations
The IceCube Collaboration performed a search for point-source populations using a technique called the non-Poissonian template fit (NPTF) and published their findings in a paper submitted to The Astrophysical Journal. This was the first time the NPTF was used on IceCube neutrino data, and while they did not find any neutrino point-source populations, they proved the technique’s viability. […]
How to deal with “dust” in the Antarctic ice
The IceCube Neutrino Observatory is an array of over 5,000 optical sensors embedded in a cubic kilometer of ice at the South Pole. Optical impurities in the ice affect how light travels through the IceCube detector and thus how the neutrino interactions appear. In a technical paper submitted to the Journal of Cosmology and Astroparticle Physics, the IceCube Collaboration presents a new method to understand the optical properties of the ice, called the SnowStorm method. […]
IceCube looks for extremely energetic gamma rays from the Milky Way
While the IceCube Neutrino Observatory is mostly known for detecting neutrinos, it is also the experiment most sensitive to PeV-scale gamma rays in the Southern Hemisphere. In a recent paper by the IceCube Collaboration submitted to The Astrophysical Journal, they discuss the results of a recent search for PeV gamma rays. No evidence of PeV gamma rays were found, but they established the most stringent constraints on PeV gamma-ray emission to date. […]
An important step towards understanding neutrino masses
In a new paper by the IceCube Collaboration, physicists use the inner and denser DeepCore detector within IceCube to try to answer this question. A weak preference is shown for NO, a result that is complementary to and in agreement with results from other experiments. This paper has been submitted to the European Physical Journal. […]