Introduction The IceCube Collaboration revisited six previous studies investigating the nature of the astrophysical neutrino flux in a combined maximum-likelihood analysis that used up to three observables—energy, zenith angle and event topology—to derive improved constraints on the energy spectrum and the composition of neutrino flavors (νe , νμ , ντ) of the astrophysical neutrino flux. […]
Week 43 at the Pole
Come summer, station personnel eagerly await the first provisions of “freshies,” as they’re called at the Pole. Despite continuing delays last week, a couple more planes have come and gone, leaving a few new faces along with the fresh fruit and bringing the station population to over 50. […]
Search for point sources with first year of IC86 data
Introduction IceCube performed a search for point-like sources of neutrinos using four years of IceCube data, including the first year of data from the completed 86-string detector, taken between May 2011 and May 2012. The search did not identify a single source, but the sensitivity was significantly improved from both the additional year of data […]
Week 42 at the Pole
This nice sun halo (properly called a 22º halo) that appeared directly above the IceCube Lab meant that there were ice crystals in the atmosphere, one of the reasons that the skiway wasn’t seeing enough action last week. Some folks were all packed up and ready to leave, but no plane was there to take them away as the flight schedule kept being pushed back due to weather. Such is life at the South Pole. […]
Week 41 at the Pole
Last week at the Pole, the first two planes of the season arrived (and then departed again—both had short stays). They were small planes, but still, any plane landing at the Pole these days is an exciting event after the long, dark, quiet winter. […]
Week 40 at the Pole
Although the South Pole is essentially a desert, a hefty accumulation of snow occurs on and around the buildings there each winter. How is that? Well, it’s the wind. Antarctica is a windy place—even with so little precipitation, it features some extraordinary blizzards thanks to strong winds. […]
Neutrinos and gamma rays, a partnership to explore the extreme universe
IceCube’s collaborative efforts with gamma-ray, X-ray, and optical telescopes started long ago. Now, the IceCube, MAGIC and VERITAS collaborations present updates to their follow-up programs that will allow the gamma-ray community to collect data from specific sources during periods when IceCube detects a higher number of neutrinos. Details of the very high energy gamma-ray follow-up program have been submitted to the Journal of Instrumentation. […]
Week 39 at the Pole
With the sun out, you can see again—and here we see all the flags surrounding the marker at the ceremonial pole. They didn’t just appear out of the darkness, though. They were recently replaced for the summer season after being taken down for the winter. […]
Week 38 at the Pole
Flags serve an important purpose at the Pole, marking out routes between places for when visibility is poor. Here you can see the IceCube Lab (ICL) in focus behind a flag line in the foreground. […]
IceCube Collaboration wraps up in Mainz, Germany
The IceCube Collaboration fall 2016 meeting ends today at Johannes Gutenberg Universität Mainz in Germany. Professors Sebastian Böser and Lutz Köpke hosted the weeklong meeting.
“It’s been a total thrill to see how fast we as a collaboration are moving forward on so many fronts in parallel,” says Sebastian Böser. “I hope everyone has enjoyed the meeting in Mainz as much as we’ve enjoyed hosting the collaboration.” […]