Physical parameters of a relativistic jet at very high redshift: the case of the blazar J1430+4204

Abstract

Context. The high-redshift (z = 4.72) blazar J1430+4204 produced a major radio outburst in 2005. Such outbursts are usually associated with the emergence of a new component in the inner radio jet. Aims. We searched for possible changes in the radio structure on milli-arcsecond angular scales, to determine physical parameters that characterise the relativistic jet ejected from the centre of this source. Methods. We analysed 15-GHz radio interferometric images obtained with the Very Long Baseline Array (VLBA) before and after the peak of the outburst. Results. We did not identify any significant new jet component over a period of 569 days. We estimated the Doppler factor, the Lorentz factor, and the apparent transverse speed of a putative jet component using three different methods. The likely small jet angle to the line of sight and our values of the apparent transverse speed are consistent with not detecting a new jet feature.

(6 pages, 4 figures) accepted for publication in Astronomy and Astrophysics

References in corpus (7)

• MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. VI. Kinematics Analysis of a Complete Sample of Blazar Jets
• Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
• Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei III. Kinematics of Parsec-Scale Radio Jets
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• Relativistic Beaming and the Intrinsic Properties of Extragalactic Radio Jets
• Bulk Comptonization spectra in blazars
• Radio and X-ray observations of an exceptional radio flare in the extreme z=4.72 blazar GB B1428+4217

Cited by in corpus (23)

• The first estimate of radio jet proper motion at z>5
• On the nature of bright compact radio sources at z>4.5
• Discovery of a Kiloparsec Scale X-ray/Radio Jet in the z=4.72 Quasar GB 1428+4217
• High-resolution images of five radio quasars at early cosmological epochs
• X-ray absorption towards high-redshift sources: probing the intergalactic medium with blazars
• Constraining the radio jet proper motion of the high-redshift quasar J2134-0419 at z=4.3
• Radio-loud Quasars above Redshift 4: VLBI Imaging of an Extended Sample
• Fast jet proper motion discovered in a blazar at z = 4.72
• Multi-frequency polarization properties of ten quasars on deca-parsec scales at z > 3
• $Fermi$-LAT detection of a transient $\gamma$-ray source in the direction of a distant blazar B3 1428+422 at $z=4.72$
• Radio Jet Proper-motion Analysis of Nine Distant Quasars above Redshift 3.5
• A compact symmetric radio source born at one-tenth the current age of the Universe
• On the Doppler boosting in the compact radio jet of the distant blazar J1026+2542 at z=5.3
• Astrometric Apparent Motion of High-redshift Radio Sources
• J2102+6015: a young radio source at z = 4.575
• Very long baseline interferometry observations of the high-redshift blazar candidate J0141-5427
• Very-long-baseline interferometry study of the flaring blazar TXS 1508+572 in the early Universe
• A compact radio source in the high-redshift soft gamma-ray blazar IGR J12319-0749
• Solid Identification of Extragalactic Gamma-Ray Source Using High-Resolution Radio Interferometric Observation
• Revisiting a Core-Jet Laboratory at High Redshift: Analysis of the Radio Jet in the Quasar PKS 2215+020 at z=3.572
• Superluminal Motion and Jet Parameters in the High-Redshift Blazar J1429+5406
• Radio Jet Properties of the Flaring Gamma-Ray Blazar PKS 0346-27
• The Total and Polarized Radio Emission from the Innermost Jets of a High-Redshift Quasar and a Candidate at Parsec-Scale Resolution