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Article overview
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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 | Abstract: | Binary 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 | Services: | Forum | Review | PDF | Favorites |
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