Date of Award
2018
Document Type
Open Access Master's Thesis
Degree Name
Master of Science in Physics (MS)
Administrative Home Department
Department of Physics
Advisor 1
Petra Huentemeyer
Committee Member 1
Robert Nemiroff
Committee Member 2
David Nitz
Abstract
The Cygnus Cocoon is an extended source of high-energy gamma-ray emission in the Cygnus region. The gamma-ray emission has been attributed to a volume 50pc in diameter of freshly-accelerated particles near the Supernova Remnant γ Cygni which is located 1.4kpc from the solar system [Ackermann et al., 2011], [Tibaldo et al., 2013]. Since its discovery in 2011, Fermi LAT has improved their event reconstruction to allow analysis at higher energies, and recorded six additional years of data. An analysis was performed on the entire dataset to reproduce the previous results, then expand on them with higher energies and larger time spans of data. No evidence of temporal variability was found for the Cocoon. It was found that for the energy range of 1-870 GeV a logparabola spectrum is preferred over a powerlaw spectrum. Analysis is then done comparing the Cocoon spectrum measured using LAT data with a HAWC source [Hona et al., 2017] that is thought to be the Cocoon. It was found that the LAT powerlaw spectrum connects with the HAWC spectrum at 1 TeV, while the LAT powerlaw spectrum is an order of magnitude lower then the HAWC source. This means that for the combined analysis the powerlaw spectrum is prefered over the logparabola, if the HAWC source is the Cocoon.
Recommended Citation
Robare, Andrew, "STUDY OF THE CYGNUS REGION WITH FERMI AND HAWC", Open Access Master's Thesis, Michigan Technological University, 2018.