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08 February 2025
 
  » arxiv » 2301.01423

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Deep search for gamma-ray emission from the accreting X-ray pulsar 1A 0535+262
X. Hou ; W. Zhang ; D. F. Torres ; L. Ji ; J. Li ;
Date 4 Jan 2023
AbstractBinary systems are a well-established subclass of gamma-ray sources. The high mass X-ray binary pulsar 1A~0535+262 has been considered to be a possible gamma-ray emitter for a long time, although former gamma-ray searches using extit{Fermi}-LAT and VERITAS data resulted in upper limits only. We aim at a deep search for gamma-ray emission and pulsations from 1A~0535+262 using more than 13 years of extit{Fermi}-LAT data. The analysis was performed for both the whole extit{Fermi}-LAT data set, as well as for the X-ray outbursts that 1A~0535+262 has experienced since the launch of extit{Fermi}. Various X-ray observations have been used to generate the ephemeris for the pulsation search. We also investigate the long-term gamma-ray flux variability and perform orbital phase-resolved analysis for the outbursts. We did not detect any steady or pulsed gamma-ray emission from 1A~0535+262 during the whole extit{Fermi}-LAT mission span or its X-ray outbursts. We thus derived the deepest gamma-ray luminosity upper limits to date at the 95\% confidence level to be around (2.3$-$4.7)$ imes 10^{32}, m erg , s^{-1}$ depending on different spectral indices assumed, which results in a ratio of $L_{ m gamma}$ to $L_{ m X}$ (2$-$150 keV) being (1.9$-$3.9)$ imes10^{-6}$.
Source arXiv, 2301.01423
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