2010A&A...524A..83F


Query : 2010A&A...524A..83F

2010A&A...524A..83F - Astronomy and Astrophysics, volume 524, A83-83 (2010/12-1)

High-resolution images of five radio quasars at early cosmological epochs.

FREY S., PARAGI Z., GURVITS L.I., CSEH D. and GABANYI K.E.

Abstract (from CDS):

Until now, there have only been seven quasars at z>4.5 whose the high-resolution radio structure had been studied in detail with Very Long Baseline Interferometry (VLBI) imaging. We almost double the number of VLBI-imaged quasars at these high redshifts with the aim of studying their redshift-dependent structural and physical properties in a larger sample. We observed five radio quasars (J0813+3508, J1146+4037, J1242+5422, J1611+0844, and J1659+2101) at 4.5<z<5 with the European VLBI Network (EVN) at 1.6GHz on 29 October 2008 and at 5GHz on 22 October 2008. The angular resolution achieved ranges from 1.5 to 25 milli-arcsec (mas), depending on the observing frequency, the position angle in the sky, and the source's celestial position. The sources are all somewhat extended on mas scales, but compact enough to be detected at both frequencies. With one exception of a flat-spectrum source (J1611+0844), their compact emission is characterised by a steep radio spectrum. We found no evidence of Doppler-boosted radio emission in the quasars in our sample. The radio structure of one of them (J0813+3508) is extended to ∼7'', which corresponds to 43kpc projected linear size. Many of the highest redshift compact radio sources are likely to be young, evolving objects, far-away cousins of the powerful gigahertz peaked-spectrum (GPS) and compact steep-spectrum (CSS) sources that populate the Universe at lower redshifts.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - quasars: general - techniques: interferometric

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 7C 055201.39+394824.00 QSO 05 55 30.8055972888 +39 48 49.166341920     18.0 17.5   ~ 487 2
2 QSO J0813+3508 QSO 08 13 33.3272185776 +35 08 10.787201808   24.72 22.54     ~ 39 0
3 7C 081210.80+364430.00 QSO 08 15 25.9449061056 +36 35 15.152473068   18.5 18.78 18.7   ~ 126 1
4 SDSS J083643.85+005453.3 QSO 08 36 43.8598536120 +00 54 53.233681320   26.19 24.17     ~ 135 0
5 QSO J0906+6930 QSO 09 06 30.7556 +69 30 30.829       21.65   ~ 74 1
6 QSO J0913+5919 QSO 09 13 16.551 +59 19 21.68   24.96 23.32 24.948   ~ 56 0
7 ICRF J092703.0+390220 Sy1 09 27 03.0138528936 +39 02 20.850343332   17.17 17.00 16.486   ~ 961 1
8 SDSS J114657.79+403708.6 QSO 11 46 57.7910518704 +40 37 08.602166820   24.80 22.78     ~ 51 0
9 6C 114419+401458 QSO 11 46 58.2981358992 +39 58 34.306186476   18.80 18.45 18.58   ~ 201 1
10 Ton 599 QSO 11 59 31.8338889192 +29 14 43.826803116   14.80 14.41 17.652 13.39 ~ 855 1
11 QSO B1202-074 QSO 12 05 23.1360370080 -07 42 32.759842896     17.5     ~ 365 5
12 QSO J1235-0003 QSO 12 35 03.0467575584 -00 03 31.746486564   23.96 22.46     ~ 44 0
13 QSO J1242+5422 QSO 12 42 30.5903382528 +54 22 57.471407076   24.87 22.63     ~ 33 0
14 6C 125058+531749 BLL 12 53 11.9204702472 +53 01 11.737422696   18.07 17.51 16.4   ~ 107 1
15 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4095 2
16 QSO J1427+3312 QSO 14 27 38.5412 +33 12 41.713         22.09 ~ 45 0
17 7C 1428+4218 QSO 14 30 23.7396678288 +42 04 36.534225756   24.43 22.04 20.2   ~ 133 1
18 [VV2006] J145147.1-151220 QSO 14 51 47.0510334120 -15 12 20.230974720     19.14     ~ 20 0
19 4C 10.45 QSO 16 08 46.2032041032 +10 29 07.779419592   18.5 18.0 18.03   ~ 355 1
20 QSO J1611+0844 QSO 16 11 05.6501762616 +08 44 35.484046080   22.20 20.88     ~ 34 0
21 [VV2006] J165634.0+182626 QSO 16 56 34.0887678552 +18 26 26.343331728   20.57 20.40 19.89   ~ 42 1
22 QSO J1659+2101 QSO 16 59 13.2291680880 +21 01 15.797607960   24.97 23.17     ~ 33 0

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2022.08.12-08:23:16

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