Optical Identification of X-ray Sources from the 14-Year INTEGRAL All-Sky Survey

Karasev, D. I.; Lutovinov, A.; Tkachenko, A.; Хорунжев, Г. А.; Krivonos, R.; Медведев, П. С.; Pavlinsky, M.; Burenin, R.; Еселевич, М.

doi:10.1134/s1063773718090037

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…The bulk (∼90%) of these identifications stemmed from the program of Masetti and collaborators which encompassed the use of at least a dozen telescopes across the globe (see Masetti et al (2013) and references therein). Further AGN identifications from other groups have also been reported in the literature like in Bikmaev et al (2006Bikmaev et al ( , 2008Zurita Heras et al (2009); Karasev et al (2018); Fortin et al (2018). It is worth noting that an overlap of detected sources is present across the INTE-GRAL and Swift/BAT (e.g.…”

Section: From First Detections To Agn Cataloguessupporting

confidence: 55%

“…Oh et al (2018)) catalogues. Therefore, several identifications of Swift hard X-ray emitters may be also accommodated in the INTEGRAL surveys (e.g., Rojas et al (2017) and references therein; Karasev et al (2018)). Thus, the total number of identifications reported above should actually be considered as a strict lower limit.…”

Section: From First Detections To Agn Cataloguesmentioning

confidence: 99%

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INTEGRAL view of AGN

Malizia,

Sazonov,

Bassani

et al. 2020

Preprint

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AGN are among the most energetic phenomena in the Universe and in the last two decades INTEGRAL's contribution in their study has had a significant impact. Thanks to the INTEGRAL extragalactic sky surveys, all classes of soft X-ray detected (in the 2-10 keV band) AGN have been observed at higher energies as well. Up to now, around 450 AGN have been catalogued and a conspicuous part of them are either objects observed at high-energies for the first time or newly discovered AGN. The high-energy domain (20-200 keV) represents an important window for spectral studies of AGN and it is also the most appropriate for AGN population studies, since it is almost unbiased against obscuration and therefore free of the limitations which affect surveys at other frequencies. Over the years, INTEGRAL data have allowed to characterise AGN spectra at high energies, to investigate their absorption properties, to test the AGN unification scheme and to perform population studies. In this review the main results are reported and INTEGRAL's contribution to AGN science is highlighted for each class of AGN. Finally, new perspectives are provided, connecting INTEGRAL's science with that at other wavelengths and in particular to the GeV/TeV regime which is still poorly explored.

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Section: From First Detections To Agn Cataloguessupporting

confidence: 55%

Section: From First Detections To Agn Cataloguesmentioning

confidence: 99%

INTEGRAL view of AGN

Malizia,

Sazonov,

Bassani

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Subsequently, optical and/or near-infrared (NIR) spectroscopy is performed on their putative lower-energy counterpart(s) with the aim to uncover their nature (see e.g. Rahoui et al 2008;Masetti et al 2013;Parisi et al 2014;Rojas et al 2017;Fortin et al 2018;Karasev et al 2018;Marchesini et al 2019, and references therein, to name a few). As a result, the nature of more than 300 INTEGRAL-discovered sources (IGRs) have been identified on a total of 560 listed in Bird et al (2016) -mainly active galactic nuclei, cataclysmic variables (CV), but also high-mass X-ray binaries (HMXB) and low-mass Xray binaries (LMXB) and a similar number is available for the new BAT transients, though the latter are dominated by extra-galactic sources.…”

Section: Introductionmentioning

confidence: 99%

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

Onori

Fiocchi

Masetti

et al. 2021

Monthly Notices of the Royal Astronomical Society

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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.

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“…This source presents an infrared excess (W 1 − W 2 = 1.245 and W 2 − W 3 = 2.407) which is also typical of AGNs (e.g. Stern et al 2012;Assef et al 2018;Karasev et al 2018).…”

Section: Nustar Resultsmentioning

confidence: 85%

NuSTAR Observations of the Unidentified INTEGRAL Sources: Constraints on the Galactic Population of HMXBs

Clavel

Tomsick

Hare

et al. 2019

ApJ

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The NuSTAR Legacy program 'Unidentified INTEGRAL sources' targeted faint hard X-ray sources revealed by INTEGRAL in the Galactic plane in order to provide conclusive identification of their nature and insights on the population of faint hard X-ray sources. The NuSTAR and Swift/XRT observations obtained in 2015-2017 contributed to the successful identification of five persistent sources. Here, we report on the spectral and variability analyses which helped to consolidate the classifications of IGR J10447-6027, IGR J16181-5407 and IGR J20569+4940 as active galactic nuclei, and IGR J17402-3656 as an intermediate polar. An optical spectrum of the blazar IGR J20569+4940 is also presented. Combining these results with successful identifications of other such faint and persistent INTEGRAL sources reported in the literature, we investigate possible implications for the population of persistent high mass X-ray binaries (HMXBs) below the identification completion limit of the INTEGRAL survey. The current trend hints at a deficit of persistent HMXBs below F 17−60keV = 10 −11 erg cm −2 s −1 , but additional efforts dedicated to classifying faint hard X-ray sources are needed before we can draw solid conclusions.

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Optical Identification of X-ray Sources from the 14-Year INTEGRAL All-Sky Survey

Cited by 8 publications

References 45 publications

INTEGRAL view of AGN

INTEGRAL view of AGN

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

NuSTAR Observations of the Unidentified INTEGRAL Sources: Constraints on the Galactic Population of HMXBs

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