BeppoSAX Low-Energy Concentrator Spectrometer background subtraction techniques

Details BeppoSAX Low-Energy Concentrator Spectrometer background subtraction techniques BeppoSAX Low-Energy Concentrator Spectrometer background subtraction techniques

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..136..407p&link_type=abstract

Astronomy and Astrophysics Supplement, v.136, p.407-418

Astronomy and Astrophysics

Astrophysics

30

Instrumentation: Detectors, Methods: Data Analysis, Diffuse Radiation, X-Rays: General

Scientific paper

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 | (deg) ) 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 3sigma confidence uncertainties of <0.9 \ 10(-3) count s(-1) (0.1-10 keV), or <1.5 \ 10(-3) count s(-1) (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 cm(-2) s(-1) for a power-law spectrum with a photon index of 2 and photoelectric absorption of 3 \ 10(20) and 3 \ 10(21) atom cm(-2) , respectively. At low galactic latitudes, or in complex regions of the X-ray sky, the uncertainties are a factor ~ 2.5 higher.

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