1998A&AS..133..431H


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST16:15:02

1998A&AS..133..431H - Astron. Astrophys., Suppl. Ser., 133, 431-436 (1998/December-2)

Spatial corrections of ROSAT HRI observations.

HARRIS D.E., SILVERMAN J.D., HASINGER G. and LEHMANN I.

Abstract (from CDS):

X-ray observations with the ROSAT High Resolution Imager (HRI) often have spatial smearing on the order of 10", Morse, 1994PASP..106..675M). This degradation of the intrinsic resolution of the instrument (5") 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 ∼30% reduction of the full width half maximum (FWHM) of an X-ray observation of the radio galaxy 3C 120. Additional examples are presented.

Abstract Copyright:

Journal keyword(s): techniques: image processing - X-rays: general

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1805 2
2 V* RZ Eri RS* 04 43 45.8303098729 -10 40 56.020152460   8.530 7.88     kA5mF5+G8IVe 169 0
3 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3889 5
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5643 0
5 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6025 3
6 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2334 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-16:15:02

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