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 ID1058
Article CategoryArticle
AuthorsAntia, H. M., Agrawal, P. C., Katoch, Tilak, Manchanda, R. K., Mukerjee, Kallol and Shah, Parag
Journal TitleAstrophysical Journal Supplement Series
Journal Citation260 (2)
Article Number40
Number of Pages7
Year2022
PublisherIOP Publishing
Place of PublicationUnited States
ISSN0067-0049
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.

KeywordsLarge Area X-Ray Proportional Counter (LAXPC); AstroSat; Space vehicle instrument
Byline AffiliationsUniversity of Mumbai, India
Tata Institute of Fundamental Research, India
University of Southern Queensland
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