Abstract and subjects
We report recent progress on the on-going NuSTAR observational campaign of 8
TeV-detected pulsar wind nebulae (PWNe). This campaign constitutes a major part
of our NuSTAR study of some of the most energetic TeV sources in our Galaxy
detected by VERITAS and HAWC. NuSTAR is the first focusing X-ray telescope
operating above 10 keV in space with sub-arcminute angular resolution.
Broad-band X-ray imaging and spectroscopy data, obtained by NuSTAR, allow us to
probe sub-PeV electron populations through detecting synchrotron X-ray
radiation. Our targets include PeVatron candidates detected by HAWC, the
Boomerang nebula, PWNe crushed by supernova remnant shocks (or relic PWNe) and
G0.9+0.1 in the Galactic Center. Using Fermi-LAT data and available TeV data,
we aim to provide a complete, multi-wavelength view of a diverse class of
middle-aged (~10-100 kyrs old) PWNe. Our NuSTAR analysis detected hard X-ray
emission from the Eel and Boomerang PWNe and characterized their broad-band
X-ray spectra most accurately. We plan to apply both time-evolution and
multi-zone PWN models to multi-wavelength spectral energy distribution (SED)
data over the radio, X-ray, GeV and TeV bands. In this proceeding, we will
review our observational campaign and discuss the preliminary results for some
PWNe.