A Swift view on IGR J19149+1036

This work has been supported by ASI grant I/011/07/0. Facility : Swift. This research has made use of data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC) provided by NASA's Goddard Space Flight Center.

Abstract

IGR J19149+1036 is a high-mass X-ray binary detected by INTEGRAL in 2011 in the hard X-ray domain. We have analysed the Burst Alert Telescope (BAT) survey data of the first 103 months of the Swift mission detecting this source at a significance level of ̃30 standard deviations. The timing analysis on the long-term BAT light curve reveals the presence of a strong sinusoidal intensity modulation of 22.25 ± 0.05 d, that we interpret as the orbital period of this binary system. A broad-band (0.3-150 keV) spectral analysis was performed combining the BAT spectrum and the X-Ray Telescope (XRT) spectra from the pointed follow-up observations. The spectrum is adequately modelled with an absorbed power law with a high-energy cutoff at ̃24 keV and an absorption cyclotron feature at ̃31 keV. Correcting for the gravitational redshift, the inferred magnetic field at the neutron star surface is B_surf ̃ 3.6 × 10¹² G.

Volume

446

Issue

1

Start page

1041

File(s)

Name

2015MNRAS__446__1041C.pdf

Size

2.08 MB

Format

Adobe PDF

Checksum (MD5)

2edfba3ec7d710d5f607b67246a9d6a9

A Swift view on IGR J19149+1036

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