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

Multiwavelength observations of the Galactic X-ray binaries IGR J20155+3827 and Swift J1713.4-4219
Multiwavelength observations of the Galactic X-ray binaries IGR J20155+3827 and Swift J1713.4-4219
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 multiwavelength approach, shedding light on the nature of a number of these new hard X-ray sources. However, a fraction are still of an 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 (near-infrared) 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 (high-mass X-ray binaries). 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 an LMXB (low-mass X-ray binaries) classification for this source.
X-rays: binaries, radiation mechanisms: non-thermal, stars: individual: IGR J20155+3827, Swift J1713.4-4219
0035-8711
472-483
Onori, F.
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Fiocchi, M.
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Masetti, N.
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Rojas, A.F.
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Bazzano, A.
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Bassani, L.
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Bird, Antony
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Onori, F.
6d512d7e-b474-4185-b856-439acc88f669
Fiocchi, M.
279b33d9-c949-4550-9b85-071c0d89469a
Masetti, N.
ff614e85-f185-4bf8-80d5-e60f5274eb53
Rojas, A.F.
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Bazzano, A.
6563500f-5a7f-44d7-80fd-cbba8a9d6d0a
Bassani, L.
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Bird, Antony
045ee141-4720-46fd-a412-5aa848a91b32

Onori, F., Fiocchi, M., Masetti, N., Rojas, A.F., Bazzano, A., Bassani, L. and Bird, Antony (2021) Multiwavelength observations of the Galactic X-ray binaries IGR J20155+3827 and Swift J1713.4-4219. Monthly Notices of the Royal Astronomical Society, 503 (1), 472-483. (doi:10.1093/mnras/stab315).

Record type: Article

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 multiwavelength approach, shedding light on the nature of a number of these new hard X-ray sources. However, a fraction are still of an 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 (near-infrared) 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 (high-mass X-ray binaries). 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 an LMXB (low-mass X-ray binaries) classification for this source.

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

Accepted/In Press date: 31 January 2021
e-pub ahead of print date: 5 February 2021
Additional Information: ARXIV IS AM
Keywords: X-rays: binaries, radiation mechanisms: non-thermal, stars: individual: IGR J20155+3827, Swift J1713.4-4219

Identifiers

Local EPrints ID: 449339
URI: http://eprints.soton.ac.uk/id/eprint/449339
ISSN: 0035-8711
PURE UUID: b363488d-2e40-4fb0-abbe-82ec8dba8efe
ORCID for Antony Bird: ORCID iD orcid.org/0000-0002-6888-8937

Catalogue record

Date deposited: 25 May 2021 16:32
Last modified: 26 Nov 2021 02:36

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Contributors

Author: F. Onori
Author: M. Fiocchi
Author: N. Masetti
Author: A.F. Rojas
Author: A. Bazzano
Author: L. Bassani
Author: Antony Bird ORCID iD

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