Search for High-energy Neutrinos from Ultraluminous Infrared Galaxies with IceCube

• Other Authors: Japaridze, George, Clark Atlanta University (Author), IceCube collaboration (Author)
• Format: Text
• Language: English
• Subjects: Clark Atlanta University; South Pole; South pole
• Online Access: https://hdl.handle.net/20.500.12322/cau.ir:2021_japaridze_george_abbasi_etal_2; https://radar.auctr.edu/islandora/object/cau.ir%3A2021_japaridze_george_abbasi_etal_2/datastream/TN/view/Search%20for%20High-energy%20Neutrinos%20from%20Ultraluminous%20Infrared%20Galaxies%20with%20IceCube.jpg

Ultraluminous infrared galaxies (ULIRGs) have infrared luminosities LIR � 1012Le, making them the most luminous objects in the infrared sky. These dusty objects are generally powered by starbursts with star formation rates that exceed 100 Me yr?1 , possibly combined with a contribution from an active galactic nucleus. Such environments make ULIRGs plausible sources of astrophysical high-energy neutrinos, which can be observed by the IceCube Neutrino Observatory at the South Pole. We present a stacking search for high-energy neutrinos from a representative sample of 75 ULIRGs with redshift z � 0.13 using 7.5 yr of IceCube data. The results are consistent with a background-only observation, yielding upper limits on the neutrino flux from these 75 ULIRGs. For an unbroken E?2.5 power-law spectrum, we report an upper limit on the stacked flux ( ) � 3.24 10 TeV cm s 10 TeV E F= � 90% 14 1 2 1 2.5 n n + - - -- - m m at 90% confidence level. In addition, we constrain the contribution of the ULIRG source population to the observed diffuse astrophysical neutrino flux as well as model predictions.