Spectral and timing analysis of BeXRB eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC). (arXiv:2208.03222v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Ghising_M/0/1/0/all/0/1">Manoj Ghising</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tobrej_M/0/1/0/all/0/1">Mohammed Tobrej</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tamang_R/0/1/0/all/0/1">Ruchi Tamang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rai_B/0/1/0/all/0/1">Binay Rai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Paul_B/0/1/0/all/0/1">Bikash Chandra Paul</a>

We have studied the Be/X-ray binary (BeXRB) pulsar eRASSU J050810.4-660653
recently discovered in the Large Magellanic Cloud (LMC). Timing and spectral
features of the source have been discussed in detail using NuSTAR & XMM-Newton
observations. Coherent pulsation of the source was detected at $sim
40.578;pm;0.001$ s using NuSTAR observation. We analyzed pulse profiles of
the source in different energy bands using NuSTAR & XMM-Newton data. The
pulse-profile evolved with time but was generally suggestive of a pencil-beam
dominated pattern, which combined with the measured luminosity, indicates that
the source may be accreting in the sub-critical regime. The pulse fraction
follows a linearly increasing trend with photon energy and is anti-correlated
with luminosity. In the 1 year interval between the XMM and NuSTAR observations
the pulse period shortened by 0.021 s which could be consistent with spin-up or
orbital Doppler effect. The average flux of the source in (3-50) keV energy
range is found to be $sim 5.56;times;10^{-11};erg;cm^{-2};s^{-1}$ and
the corresponding luminosity is $sim 1.66;times;10^{37};erg;s^{-1}$. The
variation of spectral parameters with pulse phase is studied using phase
resolved spectroscopy which reveals that the observed photon index becomes
harder with increasing flux.

We have studied the Be/X-ray binary (BeXRB) pulsar eRASSU J050810.4-660653
recently discovered in the Large Magellanic Cloud (LMC). Timing and spectral
features of the source have been discussed in detail using NuSTAR & XMM-Newton
observations. Coherent pulsation of the source was detected at $sim
40.578;pm;0.001$ s using NuSTAR observation. We analyzed pulse profiles of
the source in different energy bands using NuSTAR & XMM-Newton data. The
pulse-profile evolved with time but was generally suggestive of a pencil-beam
dominated pattern, which combined with the measured luminosity, indicates that
the source may be accreting in the sub-critical regime. The pulse fraction
follows a linearly increasing trend with photon energy and is anti-correlated
with luminosity. In the 1 year interval between the XMM and NuSTAR observations
the pulse period shortened by 0.021 s which could be consistent with spin-up or
orbital Doppler effect. The average flux of the source in (3-50) keV energy
range is found to be $sim 5.56;times;10^{-11};erg;cm^{-2};s^{-1}$ and
the corresponding luminosity is $sim 1.66;times;10^{37};erg;s^{-1}$. The
variation of spectral parameters with pulse phase is studied using phase
resolved spectroscopy which reveals that the observed photon index becomes
harder with increasing flux.

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