Issue |
A&A
Volume 690, October 2024
|
|
---|---|---|
Article Number | A260 | |
Number of page(s) | 9 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361/202450791 | |
Published online | 15 October 2024 |
Unveiling the short and faint X-ray transient nature of IGR J17419–2802
1
INAF–OAS, Osservatorio di Astrofisica e Scienza dello Spazio, Area della Ricerca del CNR, Via Gobetti 101, I-40129 Bologna, Italy
2
INAF–IASF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via A. Corti 12, 20133 Milano, Italy
Received:
20
May
2024
Accepted:
27
August
2024
We report new X-ray results from the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), Swift, Chandra, and XMM–Newton observations of the hitherto poorly studied unidentified X-ray transient IGR J17419−2802. We studied in detail the temporal, spectral, and energetic properties of three hard X-ray outbursts detected above 20 keV by INTEGRAL. They are all characterized by an average X-ray luminosity of 3 × 1035 erg s−1 and a constrained duration of a few days. This marks a peculiarly short and faint X-ray transient nature for IGR J17419−2802. From archival unpublished soft X-ray observations, we found that the source spends most of the time undetected at very low X-ray fluxes (down to < 4.7 × 10−14 erg cm−2 s−1) for a dynamic range > 2000 when in outburst. We provided an accurate arcsecond-sized source error circle. Inside it, we pinpointed the best candidate near-infrared counterpart whose photometric properties are compatible with a late-type spectral nature. Based on our new findings, we suggest that IGR J17419−2802 is a new member of the very faint X-ray transients (VFXTs) class. Detailed investigations of VFXT outbursts above 20 keV are particularly rare. In this respect, our reported INTEGRAL outbursts are among the best studied to date; in particular, their constrained duration of a few days is among the shortest ever measured for a VFXT.
Key words: accretion / accretion disks / X-rays: binaries / X-rays: individuals: IGR J17419–2802
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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