Determining the nature of faint X-ray sources from the ASCA Galactic center survey

Lutovinov, A.; Revnivtsev, M.; Karasev, D. I.; Shimansky, V. V.; Burenin, R.; Bikmaev, I.; Воробьев, В. С.; Tsygankov, Sergey S.; Pavlinsky, M.

doi:10.1134/s1063773715050060

Cited by 4 publications

(3 citation statements)

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“…SBS X34 (Swift J174023.9-285647) matches AX J1740.4-2856, which was identified with the nearby (56 pc), spectrally normal M dwarf 2MASS J17402384-2856527 by Lutovinov et al (2015). Optical flares up to V = 9 (from quiescent V = 13) were seen from 2MASS J17402384-2856527 in INTEGRAL Optical Monitor data.…”

Section: X-rays From Stellar Chromospheric Activitymentioning

confidence: 83%

The Swift bulge survey: motivation, strategy, and first X-ray results

Bahramian

Heinke

Kennea

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Very faint X-ray transients (VFXTs) are X-ray transients with peak X-ray luminosities (LX) of L$_X \lesssim 10^{36}$ erg s−1, which are not well understood. We carried out a survey of 16 deg2 of the Galactic Bulge with the Swift Observatory, using short (60 s) exposures, and returning every 2 weeks for 19 epochs in 2017–18 (with a gap from 2017 November to 2018 February, when the Bulge was in sun-constraint). Our main goal was to detect and study VFXT behaviour in the Galactic Bulge across various classes of X-ray sources. In this work, we explain the observing strategy of the survey, compare our results with the expected number of source detections per class, and discuss the constraints from our survey on the Galactic VFXT population. We detected 91 X-ray sources, 25 of which have clearly varied by a factor of at least 10. In total, 45 of these X-ray sources have known counterparts: 17 chromospherically active stars, 12 X-ray binaries, 5 cataclysmic variables (and 4 candidates), 3 symbiotic systems, 2 radio pulsars, 1 active galactic nuclei, and a young star cluster. The other 46 are of previously undetermined nature. We utilize X-ray hardness ratios, searches for optical/infrared counterparts in published catalogues, and flux ratios from quiescence to outburst to constrain the nature of the unknown sources. Of these 46, 7 are newly discovered hard transients, which are likely VFXT X-ray binaries. Furthermore, we find strong new evidence for a symbiotic nature of four sources in our full sample, and new evidence for accretion power in six X-ray sources with optical counterparts. Our findings indicate that a large subset of VXFTs is likely made up of symbiotic systems.

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Section: X-rays From Stellar Chromospheric Activitymentioning

confidence: 83%

The Swift bulge survey: motivation, strategy, and first X-ray results

Bahramian

Heinke

Kennea

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…In the previous paper (Krivonos et al 2012), we pre- Lutovinov et al 2013b, for details). A number of multi-wavelength follow-up observations were initiated to unveil the nature of these unclassified objects (Karasev et al 2012;Masetti et al 2013;Revnivtsev et al 2013;Zolotukhin & Revnivtsev 2015;Lutovinov et al 2013aLutovinov et al , 2015Tomsick et al 2015Tomsick et al , 2016aClavel et al 2016;Burenin et al 2016;Rahoui et al 2017) which led to the classification of 11 sources (shown by solid red circles in Fig. 1), rising the total survey identification completeness from ∼92% to ∼94%.…”

Section: Introductionmentioning

confidence: 99%

New hard X-ray sources discovered in the ongoing INTEGRAL Galactic plane survey after 14 yr of observations

Krivonos

Tsygankov

Mereminskiy

et al. 2017

Monthly Notices of the Royal Astronomical Society

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The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) continues to successfully work in orbit after its launch in 2002. The mission provides the deepest ever survey of hard X-ray sources throughout the Galaxy at energies above 20 keV. We report on a catalogue of new hard X-ray source candidates based on the latest sky maps comprising 14 years of data acquired with the IBIS telescope onboard INTEGRAL in the Galactic Plane (|b| < 17.5 • ). The current catalogue includes in total 72 hard Xray sources detected at S/N > 4.7σ and not known to previous INTEGRAL surveys. Among them, 31 objects have also been detected in the on-going all-sky survey by the BAT telescope of the Swift observatory. For 26 sources on the list, we suggest possible identifications: 21 active galactic nuclei, two cataclysmic variables, two isolated pulsars or pulsar wind nebulae, and one supernova remnant; 46 sources from the catalogue remain unclassified.

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“…All but SBS X103 have soft Swift/XRT spectra. We quote some key information below, from the Two Micron All Sky Survey (2MASS, Skrutskie et al 2006) SBS X34 (Swift J174023.9−285647) matches AX J1740.4−2856, which was identified with the nearby (56 pc), spectrally normal M dwarf 2MASS J17402384−2856527 by Lutovinov et al (2015). Optical flares up to V = 9 (from quiescent V = 13) were seen from 2MASS J17402384−2856527 in INTEGRAL Optical Monitor data.…”

Section: X-rays From Stellar Chromospheric Activitymentioning

confidence: 99%

The Swift Bulge Survey: Motivation, Strategy, and First X-ray Results

Bahramian,

Heinke,

Kennea

et al. 2020

Preprint

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Very faint X-ray transients (VFXTs) are X-ray transients with peak X-ray luminosities (L X ) of L X < ∼ 10 36 erg s −1 , which are not well-understood. We carried out a survey of 16 square degrees of the Galactic Bulge with the Swift Observatory, using short (60 s) exposures, and returning every 2 weeks for 19 epochs in 2017-18 (with a gap from November 2017 to February 2018, when the Bulge was in sun-constraint). Our main goal was to detect and study VFXT behaviour in the Galactic Bulge across various classes of X-ray sources. In this work, we explain the observing strategy of the survey, compare our results with the expected number of source detections per class, and discuss the constraints from our survey on the Galactic VFXT population. We detected 91 X-ray sources, of which 45 have known counterparts: 17 chromospherically active stars, 12 X-ray binaries, 5 cataclysmic variables (and 4 candidates), 3 symbiotic systems, 2 radio pulsars, 1 AGN, and a young star cluster. The other 46 are of previously undetermined nature. We utilize X-ray hardness ratios, searches for optical/infrared counterparts in published catalogs, and flux ratios from quiescence to outburst to constrain the nature of the unknown sources. Of these 46, 7 are newly discovered hard transients, which are likely VFXT X-ray binaries. Furthermore, we find strong new evidence for a symbiotic nature of 4 sources in our full sample, and new evidence for accretion power in 6 X-ray sources with optical counterparts. Our findings indicate that a large subset of VXFTs is likely made up of symbiotic systems.

show abstract

Determining the nature of faint X-ray sources from the ASCA Galactic center survey

Cited by 4 publications

References 45 publications

The Swift bulge survey: motivation, strategy, and first X-ray results

The Swift bulge survey: motivation, strategy, and first X-ray results

New hard X-ray sources discovered in the ongoing INTEGRAL Galactic plane survey after 14 yr of observations

The Swift Bulge Survey: Motivation, Strategy, and First X-ray Results

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