# A multi-wavelength study of SXP 1062, the long period X-ray pulsar associated with a supernova remnant

## TL;DR

This study provides a comprehensive multi-wavelength analysis of SXP 1062, a long-period X-ray pulsar in a Be X-ray binary, revealing its accretion behavior, magnetic field estimates, and association with a supernova remnant.

## Contribution

It offers the first detailed multi-wavelength observational campaign of SXP 1062, proposing a new accretion scenario and magnetic field estimation without requiring an extremely strong magnetic field.

## Key findings

- X-ray and optical outbursts are coincident, indicating Type I outbursts at periastron.
- The Be star's disc is likely face-on, with the neutron star's orbit inclined.
- Magnetic field estimates do not require an extremely strong magnetic field.

## Abstract

SXP 1062 is a Be X-ray binary located in the Small Magellanic Cloud. It hosts a long-period X-ray pulsar and is likely associated with the supernova remnant MCSNR J0127-7332. In this work we present a multi-wavelength view on SXP 1062 in different luminosity regimes. We consider monitoring campaigns in optical (OGLE survey) and X-ray (SWIFT telescope). During these campaigns a tight coincidence of X-ray and optical outbursts is observed. We interpret this as typical Type I outbursts as often detected in Be X-ray binaries at periastron passage of the neutron star. To study different X-ray luminosity regimes in depth, during the source quiescence we observed it with XMM-Newton while Chandra observations followed an X-ray outburst. Nearly simultaneously with Chandra observations in X-rays, in optical the RSS/SALT telescope obtained spectra of SXP 1062. On the basis of our multi-wavelength campaign we propose a simple scenario where the disc of the Be star is observed face-on, while the orbit of the neutron star is inclined with respect to the disc. According to the model of quasi-spherical settling accretion our estimation of the magnetic field of the pulsar in SXP 1062 does not require an extremely strong magnetic field at the present time.