Optical Identification of Candidates for Active Galactic Nuclei Detected by the Mikhail Pavlinsky ART-XC Telescope Onboard the SRG Observatory during an All-Sky X-ray Survey

Zaznobin, I. A.; Uskov, G.; Sazonov, S.; Burenin, R.; Медведев, П. С.; Хорунжев, Г. А.; Lyapin, A. R.; Krivonos, R.; Filippova, E.V.; Gilfanov, M.; Sunyaev, R.; Еселевич, М.; Bikmaev, I.; Irtuganov, E.; Nikolaeva, E. A.

doi:10.1134/s1063773721020067

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…This research is a continuation of the work on optical identification of X-ray sources (Zaznobin et al 2021) found during the ART-XC all-sky survey. Three out of the planned eight SRG all-sky surveys have now been completed.…”

Section: Discussionmentioning

confidence: 83%

“…We have started a program of optical follow-up observations of the new and previously unidentified X-ray sources in the ARTSS12 catalog, which has already led to the identification of several AGN, including heavily obscured ones (Zaznobin et al 2021). In this paper, we present the results of identification of 3 more ART-XC sources, which have proved to be CVs.…”

Section: Introductionmentioning

confidence: 95%

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Identification of 3 cataclysmic variables detected by the ART-XC and eROSITA telescopes aboard SRG during the all-sky X-ray survey

Zaznobin,

Sazonov,

Burenin

et al. 2021

Preprint

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We report the discovery of three previously unknown cataclysmic variables in the data of the first year of the all-sky X-ray survey by the SRG orbital observatory. The sources were selected due to their brightness in the 4-12 keV band in the data of the Mikhail Pavlinsky ART-XC telescope. They are also detected by the eROSITA telescope, which provided accurate localizations and spectral data for broad-band spectral analysis. All three objects had been previously known as X-ray sources from the ROSAT all-sky survey and XMM-Newton slew survey, but their nature remained unknown. The X-ray spectra obtained by eROSITA and ART-XC are consistent with optically thin thermal emission with a temperature kT 15 keV for SRGA J194638.9+704552 and SRGA J225412.8+690658 and kT 5 keV for SRGA J204547.8+672642. This, together with the inferred high X-ray luminosities (2 × 10 32 -3 × 10 33 erg s −1 ), strongly suggests that all 3 sources are CVs. We have obtained optical photometry and spectroscopy for these objects using the AZT-33IK 1.6-m telescope of the Sayan Observatory. The optical properties confirm the CV nature of the objects. We conclude that SRGA J194638.9+704552 is an intermediate polar, SRGA J204547.8+672642 is most likely a polar or an intermediate polar, and SRGA J225412.8+690658 can be either a magnetic or a non-magnetic CV. We also measured an orbital period of 2.98 hours for SRGA J204547.8+672642, based on TESS data. Three out of the planned eight SRG all-sky surveys have now been completed. We expect to find plenty of new CVs during the survey and to continue our optical follow-up program.

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Section: Discussionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 95%

Identification of 3 cataclysmic variables detected by the ART-XC and eROSITA telescopes aboard SRG during the all-sky X-ray survey

Zaznobin,

Sazonov,

Burenin

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…This research is a continuation of the work of optically identifying X-ray sources (Zaznobin et al 2021) that were detected during the ART-XC all-sky survey. Three out of the planned eight SRG all-sky surveys have now been completed.…”

Section: Discussionmentioning

confidence: 85%

“…We have started a program of optical follow-up observations of the new and previously unidentified X-ray sources in the ARTSS12 catalog. This has already led to the identification of several AGN, including heavily obscured ones (Zaznobin et al 2021). In this paper, we present the results of the identification of three more ART-XC sources that have been proved to be CVs.…”

Section: Introductionmentioning

confidence: 90%

Identification of three cataclysmic variables detected by the ART-XC and eROSITA telescopes on board the SRG during the all-sky X-ray survey

Zaznobin

Sazonov

Burenin

et al. 2022

A&A

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We report the discovery of three cataclysmic variables in the data of the first year of the all-sky X-ray survey by the SRG orbital observatory. The sources were selected for their brightness in the 4-12 keV band in the data of the Mikhail Pavlinsky ART-XC telescope. They are also detected by the eROSITA telescope, which provides accurate localizations and spectral data for a broadband spectral analysis. All three objects were previously known as X-ray sources from the ROSAT all-sky survey and XMM-Newton slew survey, but their nature remained unknown. The X-ray spectra obtained by eROSITA and ART-XC are consistent with optically thin thermal emission with a temperature kT ≳ 18 keV for SRGA J194638.9+704552 and SRGA J225412.8+690658 and kT ≳ 5 keV for SRGAJ204547.8+672642. Together with the inferred high X-ray luminosities (2 × 1032-3 × 1033 erg s-1), this strongly suggests that all three sources are cataclysmic variables (CVs). We have obtained optical photometry and spectroscopy for these objects using the AZT-33IK 1.6 m telescope of the Sayan Observatory. The optical properties confirm the CV nature of the objects. We conclude that SRGA J194638.9+704552 is an intermediate polar, SRGA J204547.8+672642 is likely a polar or intermediate polar, and SRGA J225412.8+690658 is either a magnetic or nonmagnetic CV. We have also measured an orbital period of 2.98 h for SRGA J204547.8+672642 based on TESS data. Three out of the planned eight SRG all-sky surveys have now been completed. We expect to find many new CVs, in particular, magnetic systems, during the survey, and we plan to continue our optical follow-up program.

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SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first year

Pavlinsky

Sazonov

Burenin

et al. 2022

A&A

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We present a first catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope on board the SRG observatory in the 4-12 keV energy band during its ongoing all-sky survey. The catalog comprises 867 sources detected on the combined map of the first two 6-month scans of the sky (December 2019 -December 2020), ART-XC sky surveys 1 and 2, or ARTSS12. The achieved sensitivity to point sources varies between ∼ 4 × 10 −12 erg s −1 cm −2 near the ecliptic plane and ∼ 8 × 10 −13 erg s −1 cm −2 (4-12 keV) near the ecliptic poles, and the typical localization accuracy is ∼ 15 . Of the 750 sources of known or suspected origin in the catalog, 56% are extragalactic (mostly active galactic nuclei, AGN; and clusters of galaxies) and the rest are Galactic (mostly cataclysmic variables, CVs; and low-and high-mass X-ray binaries). For 114 sources, ART-XC has detected X-rays for the first time. Although the majority of these (∼ 80) are expected to be spurious (given the adopted detection threshold), there can be a significant number of newly discovered astrophysical objects. We have started a program of optical follow-up observations of the new and previously unidentified X-ray sources, which has already led to the identification of several AGN and CVs. With the SRG all-sky survey planned to continue for a total of four years, we can expect the ART-XC survey in the 4-12 keV band to significantly surpass previous surveys that were carried out in similar (medium X-ray) energy bands in terms of the combination of angular resolution, sensitivity, and sky coverage.

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Optical Identification of Candidates for Active Galactic Nuclei Detected by the Mikhail Pavlinsky ART-XC Telescope Onboard the SRG Observatory during an All-Sky X-ray Survey

Cited by 7 publications

References 19 publications

Identification of 3 cataclysmic variables detected by the ART-XC and eROSITA telescopes aboard SRG during the all-sky X-ray survey

Identification of 3 cataclysmic variables detected by the ART-XC and eROSITA telescopes aboard SRG during the all-sky X-ray survey

Identification of three cataclysmic variables detected by the ART-XC and eROSITA telescopes on board the SRG during the all-sky X-ray survey

SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first year

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