Free Access

Fig. 4


Fitted MOS1 (black), MOS2 (red), and pn (green) spectra for the NPS pointing 17 along with the RASS spectrum (blue) for a region with a diameter of one degree centered on the pointing. For each of the EPIC spectra three curves show the fitted broken power law that represents the soft proton background (lower for all), the fitted cosmic spectrum plus fluorescent background lines (middle for all), and the sum of the two representing the best fit to the data. The MOS fluorescent lines are the Al K alpha and Si K alpha at 1.49 and 1.74 keV, respectively. The pn fluorescent lines are the Al K alpha and a variety of Cu, Ni, and Zn lines around 8 keV.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.