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BeppoSAX LECS background subtraction techniques | | A.N. Parmar
; T. Oosterbroek
; A. Orr
; M. Guainazzi
; N. Shane
; M. J. Freyberg
; D. Ricci
; A. Malizia
; | | Date: |
4 Feb 1999 | | Subject: | astro-ph | | Affiliation: | 1,2), M. J. Freyberg , D. Ricci , A. Malizia (4,5) ( ESA/ESTEC, University of Oxford, MPE/Garching, BeppoSAX SDC, Southampton University | | Abstract: | We present 3 methods for the subtraction of non-cosmic and unresolved cosmic backgrounds observed by the Low-Energy Concentrator Spectrometer (LECS) on-board BeppoSAX. Removal of these backgrounds allows a more accurate modeling of the spectral data from point and small-scale extended sources. At high (>|25| degree) galactic latitudes, subtraction using a standard background spectrum works well. At low galactic latitudes, or in complex regions of the X-ray sky, two alternative methods are presented. The first uses counts obtained from two semi-annuli near the outside of the LECS field of view to estimate the background at the source location. The second method uses ROSAT Position Sensitive Proportional Counter (PSPC) all-sky survey data to estimate the LECS background spectrum for a given pointing position. A comparison of the results from these methods provides an estimate of the systematic uncertainties. For high galactic latitude fields, all 3 methods give 3 sigma confidence uncertainties of <0.9 10^-3 count/s (0.1-10 keV), or <1.5 10^-3 count/s (0.1-2 keV). These correspond to 0.1-2.0 keV fluxes of 0.7-1.8 and 0.5-1.1 10^-13 erg/cm2/s for a power-law spectrum with a photon index of 2 and photoelectric absorption of 3 10^20 and 3 10^21 atom/cm2, respectively. At low galactic latitudes, or in complex regions of the X-ray sky, the uncertainties are a factor ~2.5 higher. | | Source: | arXiv, astro-ph/9902075 | | Services: | Forum | Review | PDF | Favorites | |
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