Improved Background Model for the Large Area X-Ray Proportional Counter (LAXPC) Instrument on board AstroSat

Article

Antia, H. M., Agrawal, P. C., Katoch, Tilak, Manchanda, R. K., Mukerjee, Kallol and Shah, Parag. 2022. "Improved Background Model for the Large Area X-Ray Proportional Counter (LAXPC) Instrument on board AstroSat." Astrophysical Journal Supplement Series. 260 (2). https://doi.org/10.3847/1538-4365/ac6dd0

Article Title	Improved Background Model for the Large Area X-Ray Proportional Counter (LAXPC) Instrument on board AstroSat
ERA Journal ID	1058
Article Category	Article
Authors	Antia, H. M., Agrawal, P. C., Katoch, Tilak, Manchanda, R. K., Mukerjee, Kallol and Shah, Parag
Journal Title	Astrophysical Journal Supplement Series
Journal Citation	260 (2)
Article Number	40
Number of Pages	7
Year	2022
Publisher	IOP Publishing
Place of Publication	United States
ISSN	0067-0049
	1538-4365
Digital Object Identifier (DOI)	https://doi.org/10.3847/1538-4365/ac6dd0
Web Address (URL)	https://iopscience.iop.org/article/10.3847/1538-4365/ac6dd0
Abstract	We present an improved background model for the Large Area X-ray Proportional Counter (LAXPC) detectors on board AstroSat. Because of the large collecting area and high pressure, the LAXPC instrument has a large background count rate, which varies during the orbit. Apart from the variation with latitude and longitude during the orbit there is a prominent quasi-diurnal variation which has not been previously modeled. Using over 5 yr of background observations, we determined the period of the quasi-diurnal variation to be 84,495 s and using this period it is possible to account for the variation and also identify time intervals where the fit is not good. These lead to a significant improvement in the background model. The quasi-diurnal variation can be ascribed to the changes in charged particle flux in the near-Earth orbit.
Keywords	Large Area X-Ray Proportional Counter (LAXPC); AstroSat; Space vehicle instrument
Byline Affiliations	University of Mumbai, India
	Tata Institute of Fundamental Research, India
	University of Southern Queensland

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