Outputs (4)

The effect of pulsar geometry on the observed gamma-ray spectrum of millisecond pulsars (2024)
Journal Article
Lloyd, S. J., Chadwick, P. M., & Brown, A. M. (2024). The effect of pulsar geometry on the observed gamma-ray spectrum of millisecond pulsars. Monthly Notices of the Royal Astronomical Society, 530(4), 3552-3569. https://doi.org/10.1093/mnras/stae1058

We analyse 13 yr of Fermi Large Area Telescope Pass 8 events from 127 gamma-ray emitting millisecond pulsars (MSPs) in the energy range 0.1–100 GeV and significantly detect 118 MSPs. We fit the stacked emission with a log parabola (LP) spectral model... Read More about The effect of pulsar geometry on the observed gamma-ray spectrum of millisecond pulsars.

Axion constraints from quiescent soft gamma-ray emission from magnetars (2021)
Journal Article
Lloyd, S. J., Chadwick, P. M., Brown, A. M., Guo, H.-K., & Sinha, K. (2021). Axion constraints from quiescent soft gamma-ray emission from magnetars. Physical Review D, 103(2), Article 023010. https://doi.org/10.1103/physrevd.103.023010

Axion-like-particles (ALPs) emitted from the core of a magnetar can convert to photons in its magnetosphere. The resulting photon flux is sensitive to the product of (i) the ALP-nucleon coupling Gan which controls the production cross section in the... Read More about Axion constraints from quiescent soft gamma-ray emission from magnetars.

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?”’.

Understanding the γ-ray emission from the globular cluster 47 Tuc: Evidence for dark matter? (2018)
Journal Article
Brown, A. M., Lacroix, T., Lloyd, S., Bœhm, C., & Chadwick, P. (2018). Understanding the γ-ray emission from the globular cluster 47 Tuc: Evidence for dark matter?. Physical Review D, 98(4), Article 041301(R). https://doi.org/10.1103/physrevd.98.041301

47 Tuc was the first globular cluster observed to be γ -ray bright, with the γ rays being attributed to a population of unresolved millisecond pulsars (MSPs). Recent kinematic data combined with detailed simulations appear to be consistent with the p... Read More about Understanding the γ-ray emission from the globular cluster 47 Tuc: Evidence for dark matter?.