ICRC2015

Measurements of the first two moments of the depth of shower maximum over nearly three decades of energy, combining data from the standard Pierre Auger fluorescence detector and the High Elevation Fluorescence Telescopes

31 Jul 2015, 14:45

15m

World Forum Theater (World Forum)

Oral contribution CR-EX Parallel CR07 EAS mass

Speaker

Dr Alessio Porcelli (Universite de Geneve (CH))

Description

For the first time the Pierre Auger Collaboration presents $⟨X_{\max }⟩$ and $\sigma (X_{\max })$ measurements covering nearly three decades of energy. In this analysis we include new $X_{\max }$ data obtained with the Pierre Auger High Elevation Fluorescence Telescopes (HEAT) enhancement. The HEAT telescopes cover a field of view ranging from ${30}^{\circ }$ to ${60}^{\circ }$ of elevation and are located next to one of the standard fluorescence detector sites (Coihueco). The combination of the HEAT and Coihueco telescopes covers a field of view from $\sim 2^{\circ }$ up to $\sim {60}^{\circ }$ of elevation. Thus, they can sample the atmospheric longitudinal profile of nearby lower energy showers allowing us to extend the energy range down to ${10}^{17}$eV.

Presentation materials

XmaxTalk.pdf