Flux-density measurements of the high-redshift blazar PSO J047.4478+27.2992 at 4.7 and 8.2 GHz with RATAN-600

Муфахаров, Т. В.; Михайлов, А. Г.; Sotnikova, Yu. V.; Мингалиев, М. Г.; Stolyarov, V.; Erkenov, A. K.; Nizhelskij, N. A.; Цыбулев, П. Г.

doi:10.1093/mnras/staa3688

Cited by 8 publications

(5 citation statements)

References 43 publications

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“…The radio spectrum of J0309+2717 is flat with a spectral index α = −0.53 ± 0.02 at frequencies from 0.147 GHz to 8.2 GHz (see Fig. 2, Ighina et al 2022;Mufakharov et al 2021). J0309+2717 has the brightest 250 GHz continuum emission in our sample (F cont = 4.39 ± 0.15 mJy) and the second brightest [CII] line emission (F [CII] = 2.6 ± 0.2 Jy km s −1 ).…”

Section: Resultsmentioning

confidence: 98%

The [CII] and FIR properties of z > 6 radio-loud quasars

Khusanova

Bañados

Mazzucchelli

et al. 2022

A&A

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There are only five radio-loud quasars currently known within 1 Gyr from the Big Bang (z > 6) and the properties of their host galaxies have not been explored in detail. We present a NOrthern Extended Millimeter Array (NOEMA) survey of [CII] (158 μm) and underlying continuum emission of four z > 6 radio-loud quasars, revealing their diverse properties. J0309+2717 (z = 6.10) has a bright [CII] line and underlying continuum, implying that the host galaxy is a starburst with a star-formation rate SFR = 340–1200 M⊙ yr−1. J1429+5447 (z = 6.18) has a SFR = 520 − 870 M⊙ yr−1 and its [CII] profile is consistent with two Gaussians, which could be interpreted as a galaxy merger. J1427+3312 (z = 6.12) has a moderate SFR = 30–90 M⊙ yr−1. Notably, this is a broad absorption line quasar and we searched for the presence of high-velocity outflows in the host galaxy. Although the NOEMA data tentatively reveal a broad component of the [CII] line as wide as ∼1400 km s−1, the sensitivity of our current data are not sufficient to confirm it. Finally, P172+18 (z = 6.82) is undetected in both [CII] and the continuum, implying a SFR < 22–40 M⊙ yr−1. The broad range of SFRs is similar to what is observed in radio-quiet quasars at similar redshifts. If radio jets do not significantly contribute to both [CII] and IR luminosities, this suggests there is no feedback from the jet on the star formation in the host galaxy.

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Section: Resultsmentioning

confidence: 98%

The [CII] and FIR properties of z > 6 radio-loud quasars

Khusanova

Bañados

Mazzucchelli

et al. 2022

A&A

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“…Therefore, PSO J191+86 could be a GPS object with the young relativistic jets oriented toward our line of sight. This is not uncommon at high-z, because the blazar Q0906+6930 (Romani et al 2004) at z=5.47 shows a clearly peaked radio spectrum (e.g., Coppejans et al 2017;Mufakharov et al 2021) with a turnover frequency of 6.4 GHz (observed frame), but, at the same time, Very Long Baseline Interferometry (VLBI) data found evidence of Doppler boosting (e.g., An et al 2020). These results suggest that J0906+6930 is a GPS source likely oriented toward the observer.…”

Section: Discussionmentioning

confidence: 99%

A powerful (and likely young) radio-loud quasar at z = 5.3

Belladitta

Moretti

Caccianiga

et al. 2023

A&A

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We present the discovery of PSO J191.05696+86.43172 (hereafter PSO J191+86), a new powerful radio-loud quasar (QSO) in the early Universe (z = 5.32). We discovered it by cross-matching the NRAO VLA Sky Survey (NVSS) radio catalog at 1.4 GHz with the first data release of the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS PS1) in the optical. With a NVSS flux density of 74.2 mJy, PSO J191+86 is one of the brightest radio QSO discovered at z∼5. The intensity of its radio emission is also confirmed by the very high value of radio loudness (R>300). The observed radio spectrum of PSO J191+86 shows a possible turnover around ∼1 GHz (i.e., ∼6 GHz in the rest frame), making it a Gigahertz-Peaked Spectrum (GPS) source. However, variability could affect the real shape of the radio spectrum, because the data in hand were taken ∼25 years apart. By assuming a peak in the observed radio spectrum between 1 and 2 GHz (i.e., ∼ 6 and 13 GHz in the rest-frame) we find a linear size of the source of ∼10-30 pc and a corresponding kinetic age of 150-460 yr. This would make PSO J191+86 a newly born radio source. However, the large X-ray luminosity (5.3×10 45 erg s −1 ), the flat X-ray photon index (Γ X =1.32), and the optical-X-ray spectral index ( αox =1.329) are typical of blazars. This could indicate that the nonthermal emission of PSO J191+86 is Doppler boosted. Further radio observations (both on arcsec and parsec scales) are necessary to better investigate the nature of this powerful radio QSO.

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“…We observed two comparison samples of quasars at z 3 (S1.4 GHz 100 mJy) and z 4 (S1.4 GHz 20 mJy) in 2017-2021 and revealed that the peaked spectrum is a common feature for them, almost half of the objects had the observed maximum in their radio spectra at the GHz frequencies (Sotnikova et al 2021). Using the RATAN measurements (Mufakharov et al 2021), we defined the newly discovered most distant blazar PSO J047.4478+27.2992 at z = 6.1 Belladitta et al (2020) as an MPS candidate. Comparison with the other distant blazars at z > 5 (J1026+25, J0906+69, and J1648+46) revealed the PS for three out of four of them.…”

Section: Ps Sources At High Redshiftsmentioning

confidence: 92%

Multifrequency study of gigahertz-peaked spectrum sources with RATAN-600

Sotnikova,

Mufakharov,

Mingaliev

et al. 2021

Preprint

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We report the radio continuum properties for several samples of peaked spectrum (PS) radio sources. Broadband spectra of the objects were analysed using the RATAN-600 six-frequency (1.2-22 GHz) observations and available literature data, obtained on a time scale of 20-30 years. We discuss statistical differences in radio properties for several AGN types with peaked spectra and focus on PS quasars at high redshifts (z > 3). We confirm that a relatively small fraction (1-2%) of bright PS sources can be considered as genuine GPSs when they have been monitored densely and for a long time. The contamination of GPS source samples by blazars is getting stronger as the redshift increases, and we confirm that it is underestimated due to lack of systematic multifrequency observations.

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Flux-density measurements of the high-redshift blazar PSO J047.4478+27.2992 at 4.7 and 8.2 GHz with RATAN-600

Cited by 8 publications

References 43 publications

The [CII] and FIR properties of z > 6 radio-loud quasars

The [CII] and FIR properties of z > 6 radio-loud quasars

A powerful (and likely young) radio-loud quasar at z = 5.3

Multifrequency study of gigahertz-peaked spectrum sources with RATAN-600

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