1999A&AS..136..407P


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.24CET10:59:27

1999A&AS..136..407P - Astron. Astrophys., Suppl. Ser., 136, 407-418 (1999/April-2)

BeppoSAX Low-Energy Concentrator Spectrometer background subtraction techniques.

PARMAR A.N., OOSTERBROEK T., ORR A., GUAINAZZI M., SHANE N., FREYBERG M.J., RICCI D. and MALIZIA A.

Abstract (from CDS):

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|°) 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 3σ confidence uncertainties of <0.9x10–3count/s (0.1-10keV), or <1.5x10–3count/s (0.1-2keV). These correspond to 0.1-2.0keV fluxes of 0.7-1.8 and 0.5-1.1x10–13erg/cm2/s for a power-law spectrum with a photon index of 2 and photoelectric absorption of 3x1020 and 3x1021atom/cm2, respectively. At low galactic latitudes, or in complex regions of the X-ray sky, the uncertainties are a factor ∼2.5 higher.

Abstract Copyright:

Journal keyword(s): instrumentation: detectors - methods: data analysis - diffuse radiation - X-rays: general

Errata: Erratum A+AS 137, p. 569.

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4037 2
2 V* VY Ari RS* 02 48 43.7283572894 +31 06 54.592580835   7.72   6.4   G9 205 0
3 SV* HV 5682 XB* 05 13 50.809 -69 51 47.30     16.566 16.606 16.62 ~ 304 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14544 1
5 2E 1550 XB* 05 43 34.1600994175 -68 22 22.189299745   15.9   17.2 16.54 ~ 305 0
6 OGLE LMC-SC20 113500 EB* 05 46 46.54 -71 08 53.9     19.163   18.886 ~ 240 0
7 HZ 43 ** 13 16 21.85329 +29 05 55.3793   12.52 12.66     DAwk+M3.5Ve 449 0
8 NAME Big Dipper LXB 16 28 05.5318316228 -49 12 40.011030945           ~ 206 0
9 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 410 0
10 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 911 0
11 V* V4134 Sgr LXB 17 58 40.0 -33 48 27   19.20 18.5     ~ 159 0
12 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15   ~ 459 1

    Equat.    Gal    SGal    Ecl

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2020.02.24-10:59:27

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