A Useful HESSI Software
B Web Version of the HAG
The HESSI Analysis Guide (HAG) may be viewed as a Web document on the URL's:
The HAG is available as a PostScript document; it is in two formats through the Web: for A4 paper, and for US Letter paper. Choose the one appropriate for your printer - it is designed to be printed double-sided. If you want a printed copy of the HAG, the PostScript version is recommended since the screen representation of special characters in the Hypertext version does not produce good printed output.
The HAG was prepared at the YDAC (located at the Mullard Space Science Laboratory, University College London) by Bob Bentley. The Hypertext version was translated from LaTeX using TtH, and further formatted using IDL.
This version of the HAG was prepared on: May 31, 2001
1 The word ``visibility'' was coined by radio astronomers, and has crept into the lexicon of X-ray astronomers by way of the Rotation Modulation Collimator (RMC), which is the equivalent of Earth Rotation Synthesis in radio astronomy. The bridge between radio and X-ray terminology is the modulation pattern. For an X-ray telescope, this is the two-dimensional field of probabilities that a photon coming from a certain direction will pass through the rotating collimator to the detector.