Spatial Corrections of ROSAT HRI Observations

Details Spatial Corrections of ROSAT HRI Observations Spatial Corrections of ROSAT HRI Observations

1998-11-08

arxiv.org/abs/astro-ph/9811121v1

Astronomy and Astrophysics

Astrophysics

AandA latex (6 pages with 7 embedded postscript figures). Scheduled for publication in the 1 Dec issue of Astron. Astrophys. S

Scientific paper

10.1051/aas:1998333

X-ray observations with the ROSAT High Resolution Imager (HRI) often have spatial smearing on the order of 10 arcsec (Morse 1994). This degradation of the intrinsic resolution of the instrument (5 arcsec) can be attributed to errors in the aspect solution associated with the wobble of the space craft or with the reacquisition of the guide stars. We have developed a set of IRAF/PROS and MIDAS/EXSAS routines to minimize these effects. Our procedure attempts to isolate aspect errors that are repeated through each cycle of the wobble. The method assigns a 'wobble phase' to each event based on the 402 second period of the ROSAT wobble. The observation is grouped into a number of phase bins and a centroid is calculated for each sub-image. The corrected HRI event list is reconstructed by adding the sub-images which have been shifted to a common source position. This method has shown approx. 30% reduction of the full width half maximum (FWHM) of an X-ray observation of the radio galaxy 3C 120. Additional examples are presented.

Affiliated with

Also associated with

No associations

Rating

Spatial Corrections of ROSAT HRI Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spatial Corrections of ROSAT HRI Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spatial Corrections of ROSAT HRI Observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-711454