Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z$\approx5.5$

Khorunzhev, G. A.; Meshcheryakov, A. V.; Medvedev, P. S.; Borisov, V. D.; Burenin, R. A.; Krivonos, R. A.; Uklein, R. I.; Shablovinskaya, E. S.; Afanasyev, V. L.; Dodonov, S. N.; Sunyaev, R. A.; Sazonov, S. Yu.; Gilfanov, M. R.

doi:10.48550/arxiv.2104.05142

Cited by 3 publications

(4 citation statements)

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“…21 the spectrum of one of such quasars discovered by SRG/eROSITA at z = 5.5 is shown. It was obtained with the 6-meter BTA telescope in the North Caucasus (Khorunzhev et al 2021).…”

Section: X-ray Maps Obtained During the First All-sky Survey And The ...mentioning

confidence: 99%

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The SRG X-ray orbital observatory, its telescopes and first scientific results

Sunyaev,

Arefiev,

Babyshkin

et al. 2021

Preprint

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The Orbital Observatory Spektr-RG (SRG), equipped with the grazing-incidence X-ray telescopes Mikhail Pavlinsky ART-XC and eROSITA, was launched by Roscosmos to the Lagrange L2 point of the Sun-Earth system on Jule 13, 2019. The launch was carried out from the Baikonur cosmodrome by a Proton-M rocket with a DM-03 upper stage. The German telescope eROSITA was installed on SRG under an agreement between Roskosmos and the DLR German Aerospace Agency. In December 2019, the Observatory started to perform its main scientific task: scanning the celestial sphere in order to obtain maps of the entire sky in X-rays in several energy ranges (from 0.3 to 8 keV, eROSITA, and from 4 to 30 keV, ART-XC). By mid-December 2020, the second 6-month full-sky scan had been completed. Over a period of 4 years, it is planned to obtain 8 independent maps of the entire sky in each of the energy ranges. The sum of these maps will provide high sensitivity and reveal more than three million quasars and over one hundred thousand massive galaxy clusters and galaxy groups. The availability of 8 sky maps will enable monitoring of long-term variability (every six months) of a huge number of extragalactic and Galactic X-ray sources, including hundreds of thousands of stars with active coronae. In addition, the rotation of the satellite around the axis directed toward the Sun with a period of 4 hours makes it possible to track faster variability of bright X-ray sources during one day every half a year. The chosen strategy of scanning the sky leads to the formation of deep survey zones near both ecliptic poles. The paper presents sky maps obtained by the telescopes aboard SRG during the first scan of the entire sky and a number of results of deep observations performed during the flight to the L2 point in the frame of the Performance Verification program, demonstrating the capabilities of the Observatory in imaging, spectroscopy and timing of X-ray sources. It is planned that in December 2023 the Observatory will switch, for at least two years, to observations of the most interesting sources in the sky in triaxial orientation mode and deep scanning of selected celestial fields with an area of up to 150 square degrees. These modes of operation were tested during the Performance Verification phase. Every day, data from the SRG observatory are dumped onto the largest antennae of the Russian Deep Space Network in Bear Lakes and near Ussuriysk.

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“…21 the spectrum of one of such quasars discovered by SRG/eROSITA at z = 5.5 is shown. It was obtained with the 6-meter BTA telescope in the North Caucasus (Khorunzhev et al 2021).…”

Section: X-ray Maps Obtained During the First All-sky Survey And The ...mentioning

confidence: 99%

“…The vertical dashed lines show the expected positions of the peaks of the emission lines of the quasar at z = 5.466. Adapted from(Khorunzhev et al 2021).…”

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confidence: 99%

The SRG X-ray orbital observatory, its telescopes and first scientific results

Sunyaev,

Arefiev,

Babyshkin

et al. 2021

Preprint

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“…Having the maximal sky coverage possible and a relatively high sensitivity (from 4.4 × 10 −14 erg/s/cm 2 after the first scan, e-RASS:1, to 1.1 × 10 −14 erg/s/cm 2 after 8 scans, eRASS:8, in the 0.5-2 keV energy band) this mission is ideal for the detection of a large number of X-ray powerful sources at high-𝑧 (e.g. Medvedev et al 2020;Wolf et al 2021;Khorunzhev et al 2021). Following the approach outlined in section 3 for the BAT105 sample, we computed the number and properties of the blazars expected to be found by the eROSITA mission.…”

Section: Predictions For the Erosita Missionmentioning

confidence: 99%

The Impact of the CMB on the Evolution of high-z Blazars

Ighina,

Caccianiga,

Moretti

et al. 2021

Preprint

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Different works have recently found an increase of the average X-ray-to-radio luminosity ratio with redshift in the blazar population. We evaluate here whether the inverse Compton interaction between the relativistic electrons within the jet and the photons of the Cosmic Microwave Background (IC/CMB) can explain this trend. Moreover, we test whether the IC/CMB model can also be at the origin of the different space density evolutions found in X-ray and radio selected blazar samples. By considering the best statistically complete samples of blazars selected in the radio or in the X-ray band and covering a large range of redshift (0.5 z 5.5), we evaluate the expected impact of the CMB on the observed X-ray emission on each sample and then we compare these predictions with the observations. We find that this model can satisfactorily explain both the observed trend of the X-ray-to-radio luminosity ratios with redshift and the different cosmological evolutions derived from the radio and X-ray band. Finally, we discuss how currently on-going X-ray missions, like eROSITA, could help to further constrain the observed evolution at even higher redshifts (up to z∼6-7).

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“…At higher redshifts (z 5), in small and deep fields there are only three X-ray sources: two sources in the COSMOS field (Marchesi et al 2016) with the highest one at z = 5.3 (Capak et al 2011), and one source in the Chandra Deep Field North (Barger et al 2003) at z = 5.186. In the larger and shallower XMM-XXL field, Menzel et al (2016) found a source at z = 5.011, while more recently, with the eROSITA telescope (Predehl et al 2021) on board the Spectrum-Roentgen-Gamma mission, it was possible to identify one more source at z = 5.46 (Khorunzhev et al 2021). In addition to the aforementioned studies, there are plenty of known high-z optically selected AGN matched with X-ray catalogues or follow-up X-ray observations (Vito et al 2016;Medvedev et al 2020;Wolf et al 2021).…”

Section: Introductionmentioning

confidence: 99%

XXL-HSC: An updated catalogue of high-redshift ($z\geqslant3.5$) X-ray AGN in the XMM-XXL northern field. Constraints on the bright end of the soft logN-logS

Pouliasis,

Georgantopoulos,

Ruiz

et al. 2021

Preprint

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X-rays offer a reliable method to identify Active Galactic Nuclei (AGN). However, in the high-redshift Universe X-ray AGN are poorly sampled due to their relatively low space density and the small areas covered by X-ray surveys. In addition to wide-area X-ray surveys, it is important to have deep optical data in order to locate the optical counterparts and determine their redshifts. In this work, we build a high-redshift (z 3.5) X-ray selected AGN sample in the XMM-XXL northern field using the most updated [0.5-2 keV] catalogue along with a plethora of new spectroscopic and multi-wavelength catalogues, including the deep optical Subaru Hyper Suprime-Cam (HSC) data reaching magnitude limits i∼26 mag. We select all the spectroscopically confirmed AGN and complement this sample with high-redshift candidates that are HSC g-and r-band dropouts. To confirm the dropouts, we derive their photometric redshifts using spectral energy distribution techniques. We end up with a sample of 54 high-z sources (28 with spec-z), the largest in this field so far (almost three times larger than in previous studies), and we estimate the possible contamination and completeness. We calculate the number counts (logN-logS) in different redshift bins and compare our results with previous studies and models. We provide the strongest high-redshift AGN constraints yet at bright fluxes (f 0.5−2 keV > 10 −15 erg s −1 cm −2 ). The samples of z 3.5, z 4 and z 5 are in agreement with an exponential decline model similar to that witnessed at optical wavelengths. Our work emphasizes the importance of using wide area X-ray surveys with deep optical data to uncover high redshift AGN.

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Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z$\approx5.5$

Cited by 3 publications

References 21 publications

The SRG X-ray orbital observatory, its telescopes and first scientific results

The SRG X-ray orbital observatory, its telescopes and first scientific results

The Impact of the CMB on the Evolution of high-z Blazars

XXL-HSC: An updated catalogue of high-redshift ($z\geqslant3.5$) X-ray AGN in the XMM-XXL northern field. Constraints on the bright end of the soft logN-logS

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