eSASS task: radec2xy

Scope

This document provides a description of the algorithm and instructions for the correct usage of the RADEC2XY task, which is part of eSASS (the eROSITA Science Analysis Software System).

Description

Task RADEC2XY calculates X and Y sky pixel coordinates (tangential parallel projection; pixel size: 0.05'') corresponding to the RA and DEC (J2000) event coordinates in an eROSITA event table, given an RA and DEC projection center provided on the command line.

Parameters

• file (string) REQUIRED
  • Input event table
• ra0 (real) REQUIRED
  • RA reference coordinate
• dec0 (real) REQUIRED
  • DEC reference coordinate

Input file

• EVENTS table extension of eROSITA calibrated event file

Output file

• EVENTS table extension of eROSITA calibrated event file