Discovery of the Most X-ray Luminous Quasar SRGE J170245.3+130104 at Redshift $$\boldsymbol{z\approx 5.5}$$

Хорунжев, Г. А.; Meshcheryakov, A. V.; Медведев, П. С.; Borisov, V. D.; Burenin, R.; Krivonos, R.; Уклеин, Р. И.; Shablovinskaya, Elena; Afanasyev, V. L.; Додонов, С. Н.; Sunyaev, R.; Sazonov, S.; Gilfanov, M.

doi:10.1134/s1063773721030026

Cited by 24 publications

(13 citation statements)

References 85 publications

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“…The X-ray properties of ATLAS J025.6821-33.4627 from 2SXPS are included in the compilation of known high-redshift quasars by Vito et al (2019) but we now identify this source as a truly serendipitous detection with ExSeSS. Comparing to known X-ray detected high redshift AGN (see Khorunzhev et al 2021, and references there in), as shown in figure 2, ATLAS J025.6821-33.4627 can be Table 1. The medium-band (1-2 keV) Swift position, observed Swift X-ray flux in the soft-band (0.5-2 keV), the rest-frame 2-10 keV luminosity given by this soft-band flux and the z-band AB magnitude of the high redshift ExSeSS source.…”

Section: Identifying X-ray Luminous High Redshift Sourcesmentioning

confidence: 74%

“…With the launch of eROSITA-providing a new generation of sensitive, wide-area X-ray surveys (Predehl et al 2021)-there is the potential to discover many more of the rare, high-luminosity X-ray selected AGN at 𝑧 6 and improve our constraints on the XLF. Indeed, Khorunzhev et al (2021) and Medvedev et al (2020) have reported the discovery of highly luminous X-ray emission from quasars at 𝑧 ≈ 5.5 and 𝑧 = 6.18, respectively, in the early all-sky eROSITA scans. Wolf et al (2021) placed constraints on the XLF at 𝑧 ∼ 6 using a single X-ray detected quasar at 𝑧 = 5.81, found in the eROSITA Final Equatorial Depth Survey (eFEDS) that provides performance verification data in a ∼140 deg 2 field at the depth of the final 4-year eROSITA all-sky surveys (Brunner et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…The X-ray luminosity of our 𝑧 > 6 ExSeSS source with respect to redshift (black star). The distribution of known high redshift AGN with spectroscopic redshifts, observed in X-rays (seeKhorunzhev et al 2021, and references there in) is shown by the light blue points with the few serendipitously detected high redshift sources from the eROSITA and COSMOS surveys shown for comparison (red diamonds). Our source can be seen to be the highest redshift source identified serendipitously by X-ray surveys with a well-defined area coverage, from which an XLF can be determined.…”

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confidence: 99%

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Constraints on the X-ray Luminosity Function of AGN at z=5.7-6.4 with the Extragalactic Serendipitous Swift Survey

Barlow-Hall¹,

Delaney²,

Aird³

et al. 2022

Preprint

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X-ray luminosity functions (XLFs) of Active Galactic Nuclei (AGN) trace the growth and evolution of supermassive black hole populations across cosmic time, however, current XLF models are poorly constrained at redshifts of 𝑧 > 6. In this work we constrain the bright-end of the XLF at 𝑧 = 5.7 − 6.4 using high-redshift AGN identified within the Extragalactic Serendipitous Swift Survey (ExSeSS) catalogue. Within ExSeSS we find one serendipitously detected X-ray selected 𝑧 > 6 AGN, ATLAS J025.6821-33.4627, with an X-ray luminosity of 𝐿 X = 8.47 +3.40 −3.13 × 10 44 erg.s −1 and 𝑧 = 6.31 ± 0.03 making it the highest redshift, spectroscopically confirmed, serendipitously detected X-ray selected quasar known to date. We also calculate an upper limit on the space density at higher luminosities where no additional sources are found, enabling us to place constraints on the shape of the XLF. Our results are consistent with the rapid decline in the space densities of high-luminosity AGN toward high redshift as predicted by extrapolations of existing parametric models of the XLF. We also find that our X-ray based measurements are consistent with estimates of the bolometric quasar luminosity function based on UV measurements at 𝑧 6, although they require a large X-ray to bolometric correction factor (i.e. AGN that are relatively X-ray weak) at these high luminosities.

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Section: Identifying X-ray Luminous High Redshift Sourcesmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Constraints on the X-ray Luminosity Function of AGN at z=5.7-6.4 with the Extragalactic Serendipitous Swift Survey

Barlow-Hall¹,

Delaney²,

Aird³

et al. 2022

Preprint

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“…the Visible and Infrared Survey Telescope for Astronomy (VISTA) Kilo-degree Infrared Galaxy survey (VIKINGs), (Edge et al 2013); the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) surveys, (Chambers et al 2016)); and Xray bands (e.g. the extended ROentgen Survey with an Imaging Telescope Array (eROSITA), Medvedev et al 2020;Khorunzhev et al 2021). These observations are advancing the understanding of the co-evolution of the first-generation black holes in the Universe and their host galaxies.…”

Section: Introductionmentioning

confidence: 99%

VLBI observations of VIK J2318−3113, a quasar atz = 6.44

Zhang

Wang

et al. 2022

A&A

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Context. The nature of jets in active galactic nuclei (AGNs) in the early Universe and their feedback to the host galaxy remains a highly topical question. Observations of the radio structure of high-redshift AGNs enabled by very long baseline interferometry (VLBI) provide indispensable input into studies of their properties and role in the galaxies’ evolution. To date, only five AGNs at redshift z > 6 have been studied with the VLBI technique. Aims. VIK J2318−3113 is a recently discovered quasar at z = 6.44 that had not been imaged with VLBI before the current work. Here we present the first VLBI imaging results of this high-redshift quasar, with the aim of corroborating its high-resolution appearance with the physical model of the object. Methods. We carried out VLBI phase-referencing observations of VIK J2318−3113 using the Very Long Baseline Array at two frequencies, 1.6 and 4.7 GHz, and obtained the first view at the radio structure on the milliarcsecond scale. Results. The source was clearly detected at 1.6 GHz. We found that almost all of its radio emission comes from the parsec-scale core region. Our dual-frequency observations constrain the spectral index and brightness temperature of the radio core. Its properties are similar to those of other known high-redshift radio-loud AGNs.

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“…sity (e.g., Kellermann et al 1989). Conversely, the most X-ray luminous quasars in the z > 3 universe tend to be radio-loud quasars or blazars (e.g., Khorunzhev et al 2021). As such, this source presents a unique opportunity to study the radio-quiet z > 3 quasar population in detail.…”

Section: Gral J0659+1629mentioning

confidence: 99%

Gaia GraL: Gaia DR2 Gravitational Lens Systems. VII. XMM-Newton Observations of Lensed Quasars

Connor,

Stern,

Krone-Martins

et al. 2021

Preprint

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We present XMM-Newton X-ray observations of nine confirmed lensed quasars at 1 z 3 identified by the Gaia Gravitational Lens program. Eight systems are strongly detected, with 0.3-8.0 keV fluxes F 0.3−8.0 5 × 10 −14 erg cm −2 s −1 . Modeling the X-ray spectra with an absorbed power law, we derive power law photon indices and 2-10 keV luminosities for the eight detected quasars. In addition to presenting sample properties for larger quasar population studies and for use in planning for future caustic crossing events, we also identify three quasars of interest: a quasar that shows evidence of flux variability from previous ROSAT observations, the most closely-separated individual lensed sources resolved by XMM-Newton, and one of the X-ray brightest quasars known at z > 3. These sources represent the tip of discovery that will be enabled by SRG/eROSITA. Unified Astronomy Thesaurus concepts: Quasars (1319); Strong gravitational lensing (1643); X-ray astronomy (1810); X-ray quasars (1821); Scaling relations (2031)

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Discovery of the Most X-ray Luminous Quasar SRGE J170245.3+130104 at Redshift $$\boldsymbol{z\approx 5.5}$$

Cited by 24 publications

References 85 publications

Constraints on the X-ray Luminosity Function of AGN at z=5.7-6.4 with the Extragalactic Serendipitous Swift Survey

Constraints on the X-ray Luminosity Function of AGN at z=5.7-6.4 with the Extragalactic Serendipitous Swift Survey

VLBI observations of VIK J2318−3113, a quasar atz = 6.44

Gaia GraL: Gaia DR2 Gravitational Lens Systems. VII. XMM-Newton Observations of Lensed Quasars

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