2013A&A...555A..52B


Query : 2013A&A...555A..52B

2013A&A...555A..52B - Astronomy and Astrophysics, volume 555A, 52-52 (2013/7-1)

INTEGRAL/SPI data segmentation to retrieve source intensity variations.

BOUCHET L., AMESTOY P.R., BUTTARI A., ROUET F.-H. and CHAUVIN M.

Abstract (from CDS):

The INTEGRAL/SPI, X/γ-ray spectrometer (20 keV-8 MeV) is an instrument for which recovering source intensity variations is not straightforward and can constitute a difficulty for data analysis. In most cases, determining the source intensity changes between exposures is largely based on a priori information. We propose techniques that help to overcome the difficulty related to source intensity variations, which make this step more rational. In addition, the constructed ``synthetic'' light curves should permit us to obtain a sky model that describes the data better and optimizes the source signal-to-noise ratios. For this purpose, the time intensity variation of each source was modeled as a combination of piecewise segments of time during which a given source exhibits a constant intensity. To optimize the signal-to-noise ratios, the number of segments was minimized. We present a first method that takes advantage of previous time series that can be obtained from another instrument on-board the INTEGRAL observatory. A data segmentation algorithm was then used to synthesize the time series into segments. The second method no longer needs external light curves, but solely SPI raw data. For this, we developed a specific algorithm that involves the SPI transfer function. The time segmentation algorithms that were developed solve a difficulty inherent to the SPI instrument, which is the intensity variations of sources between exposures, and it allows us to obtain more information about the sources' behavior.

Abstract Copyright:

Journal keyword(s): methods: data analysis - methods: numerical - techniques: miscellaneous - techniques: imaging spectroscopy - methods: statistical - gamma rays: general

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* BQ Cam HXB 03 34 59.9116110096 +53 10 23.296879776   17.16 15.42 14.26 13.04 O8.5Ve 461 1
2 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 2024 0
3 HD 153919 HXB 17 03 56.7725629224 -37 50 38.913331452 6.06 6.78 6.51 6.08 5.90 O6Iafcp 800 1
4 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 810 1
5 V* V2116 Oph Sy* 17 32 02.1532435416 -24 44 44.129169096   20.78 18.4     M6IIIe 683 1
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13893 0
7 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 717 0
8 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 385 1
9 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 337 0
10 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2559 0
11 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4268 0

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2023.09.26-01:19:20

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