Professor Paula Chadwick's Outputs (4)

Reply to “Comment on ‘Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?”’ (2019)
Journal Article
Brown, A. M., Lacroix, T., Lloyd, S., Bœhm, C., & Chadwick, P. (2019). Reply to “Comment on ‘Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?”’. Physical Review D, 100(6), Article 068302. https://doi.org/10.1103/physrevd.100.068302

Analyzing nine years of Fermi-LAT observations, we recently studied the spectral properties of the prominent globular cluster [Phys. Rev. 98, 041301 (2018)]. In particular, we investigated several models to explain the observed gamma-ray emission, ra... Read More about Reply to “Comment on ‘Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?”’.

Constraining Axion Mass through Gamma-ray Observations of Pulsars (2019)
Journal Article
Lloyd, S. J., Chadwick, P. M., & Brown, A. M. (2019). Constraining Axion Mass through Gamma-ray Observations of Pulsars. Physical Review D, 100(6), Article 063005. https://doi.org/10.1103/physrevd.100.063005

We analyze nine years of PASS 8 Fermi-LAT data in the 60–500 MeV range and determine flux upper limits (ULs) for 17 gamma-ray dark pulsars as a probe of axions produced by nucleon-nucleon Bremsstrahlung in the pulsar core. Using a previously publishe... Read More about Constraining Axion Mass through Gamma-ray Observations of Pulsars.

Fermi-LAT observations of extreme spectral variability in IC 310 (2019)
Journal Article
Graham, J. A., Brown, A. M., & Chadwick, P. M. (2019). Fermi-LAT observations of extreme spectral variability in IC 310. Monthly Notices of the Royal Astronomical Society, 485(3), 3277-3287. https://doi.org/10.1093/mnras/stz588

We investigate the physical mechanisms of high-energy gamma-ray emission from the TeV-emitting misaligned active galactic nucleus IC 310. 8 yr of data from the Fermi Large Area Telescope (Fermi-LAT) between 100 MeV and 500 GeV are reduced and analyse... Read More about Fermi-LAT observations of extreme spectral variability in IC 310.

Gamma-rays from SS433: evidence for periodicity (2019)
Journal Article
Rasul, K., Chadwick, P. M., Graham, J. A., & Brown, A. M. (2019). Gamma-rays from SS433: evidence for periodicity. Monthly Notices of the Royal Astronomical Society, 485(2), 2970-2975. https://doi.org/10.1093/mnras/stz559

In this paper we present our study of the gamma-ray emission from the microquasar SS433. Integrating over 9 yr of Fermi-LAT Pass 8 data, we detect SS433 with a significance of ∼13σ in the 200 to 500 MeV photon energy range, with evidence for an exten... Read More about Gamma-rays from SS433: evidence for periodicity.