Multi-wavelength observations of the Galactic X-ray binaries IGR J20155+3827 and Swift J1713.4-4219

Abstract

In recent years, thanks to the continuous surveys performed by INTEGRAL and Swift satellites, our knowledge of the hard X-ray/soft gamma-ray sky has greatly improved. As a result it is now populated with about 2000 sources, both Galactic and extra-galactic, mainly discovered by IBIS and BAT instruments. Many different follow-up campaigns have been successfully performed by using a multi-wavelength approach, shedding light on the nature of a number of these new hard X-ray sources. However, a fraction are still of a unidentified nature. This is mainly due to the lack of lower energy observations, which usually deliver a better constrained position for the sources, and the unavailability of the key observational properties, needed to obtain a proper physical characterization. Here we report on the classification of two poorly studied Galactic X-ray transients IGR J20155+3827 and Swift J1713.4-4219, for which the combination of new and/or archival X-ray and Optical/NIR observations have allowed us to pinpoint their nature. In particular, thanks to XMM\Newton archival data together with new optical spectroscopic and archival Optical/NIR photometric observations, we have been able to classify IGR J20155+3827 as a distant HMXB. The new INTEGRAL and Swift data collected during the 2019 X-ray outburst of Swift J1713.4-4219, in combination with the archival optical/NIR observations, suggest a LMXB classification for this source.

Accepted for publication in MNRAS

References in corpus (14)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The first XMM-Newton slew survey catalogue: XMMSL1
• "Skinny Milky Way, Please", says Sagittarius
• The shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
• The Streams of the Gaping Abyss: A population of entangled stellar streams surrounding the Inner Galaxy
• Gaps in globular cluster streams: giant molecular clouds can cause them too
• The PAndAS Field of Streams: stellar structures in the Milky Way halo toward Andromeda and Triangulum
• Milky Way Mass and Potential Recovery Using Tidal Streams in a Realistic Halo
• Discovery of a cold stellar stream in the ATLAS DR1 data
• Fourteen candidate RR Lyrae star streams in the inner Galaxy
• Chandra Localizations and Spectra of INTEGRAL Sources in the Galactic Plane
• Feeling the pull, a study of natural Galactic accelerometers. II: kinematics and mass of the delicate stellar stream of the Palomar 5 globular cluster
• Accretion regimes in the X-ray pulsar 4U 1901+03
• Chandra Observations of High Energy X-ray Sources Discovered by INTEGRAL

Cited by in corpus (1)

• Investigating the true nature of three hard X-ray sources