2022A&A...663A.147S


Query : 2022A&A...663A.147S

2022A&A...663A.147S - Astronomy and Astrophysics, volume 663A, 147-147 (2022/7-1)

Blazar nature of high-z radio-loud quasars.

SBARRATO T., GHISELLINI G., TAGLIAFERRI G., TAVECCHIO F., GHIRLANDA G. and COSTAMANTE L.

Abstract (from CDS):

We report on the Swift/XRT observation and classification of eleven blazar candidates at z > 4. These sources were selected as part of a sample of extremely radio-loud quasars, with a focus on quasars with jets oriented roughly close to our line of sight. Deriving their viewing angles and their jets' bulk Lorentz factors was crucial for a strict blazar classification, which was made possible only thanks to X-ray observations. Out of eleven sources, five show strong and hard X-ray fluxes that set the foundation for their blazar classification, while two are uncertain and three host relativistic jets that we observe just outside their beaming cone (i.e. are not strictly blazars), while one went undetected by Swift/XRT. Following this approach, we were able to trace the > 109 M active super-massive black hole (SMBH) population hosted in jetted active galactic nuclei (AGN). At z ≳ 4, the massive jetted sources are likely predominant in the overall quasar population: this calls for a deep review of our understanding of the first SMBH formations and evolution. Jets are indeed key actors in fast accretion and must be searched for across the whole high-redshift quasar population. A note of caution must be added: radio-loudness and, in general, radio features at high redshifts seem do not seem to perfectly reflect high-energy properties. A strong effect attributed to the interaction with cosmic microwave background (CMB) radiation is surely at work, which quenches the radio emission with respect to the X-rays; however, in addition, more frequent occasions for the jet to be bent seem to play a relevant role in this regard. Thus, classifications and population studies must be carefully performed, so as to avoid interference resulting from these inconsistencies.

Abstract Copyright: © T. Sbarrato et al. 2022

Journal keyword(s): galaxies: jets - quasars: general - galaxies: active - X-rays: general

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 SDSS J030437.21+004653.7 QSO 03 04 37.213 +00 46 53.70   22.72 21.48     ~ 23 0
2 PSO J047.4478+27.2992 Bla 03 09 47.44 +27 17 57.6           ~ 34 0
3 QSO J0813+3508 QSO 08 13 33.3272185776 +35 08 10.787201808   24.72 22.54     ~ 46 1
4 SDSS J085111.59+142337.7 QSO 08 51 11.5985268456 +14 23 37.714007112   22.80 21.59     ~ 20 0
5 SDSS J103717.72+182303.0 QSO 10 37 17.7301065552 +18 23 03.089060844   22.25 21.04     ~ 15 0
6 QSO B1050-0000 QSO 10 53 20.4267162840 -00 16 49.652922360   22.49 20.77     ~ 65 0
7 SDSS J123142.17+381658.9 QSO 12 31 42.1733201928 +38 16 59.050272720   22.18 21.20     ~ 30 0
8 QSO J1235-0003 QSO 12 35 03.0467575584 -00 03 31.746486564   23.96 22.46     ~ 48 0
9 QSO J1242+5422 QSO 12 42 30.5903382528 +54 22 57.471407076   24.87 22.63     ~ 38 0
10 SDSS J141209.96+062406.8 QSO 14 12 09.9691953864 +06 24 06.868135080   22.56 21.35     ~ 40 0
11 QSO J1659+2101 QSO 16 59 13.2291680880 +21 01 15.797607960   24.97 23.17     ~ 37 0
12 [VV2006] J231448.7+020151 QSO 23 14 48.7159854264 +02 01 51.111292944     19.87     ~ 21 1

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