The Milliarcsecond‐Scale Jet in the Quasar J1625+4134 | Zendy

Dongrong Jiang | Zendy; J. F. Zhou | Zendy; Xiaoyu Hong | Zendy; Leonid Gurvits | Zendy; Z. Shen | Zendy; Y. J. Chen | Zendy

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The Milliarcsecond‐Scale Jet in the Quasar J1625+4134

Author(s) -

Dongrong Jiang,

J. F. Zhou,

Xiaoyu Hong,

Leonid Gurvits,

Z. Shen,

Y. J. Chen

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/342145

Subject(s) - very long baseline interferometry , physics , very long baseline array , jet (fluid) , line of sight , astrophysics , quasar , doppler effect , position angle , proper motion , spectral index , spectral line , astronomy , stars , galaxy , thermodynamics

We present Very Long Baseline Array (VLBA) observations of the radio sourceJ1625+4134 at 22 and 15 GHz and analyze them in concurrence with other existingVLBI data on this source. The high resolution images at 15 and 22 GHz show ashort and bending jet which has about $270\degr$ difference in position anglewith the northern jet detected at lower frequencies. The new high resolutiondata, combined with the data available in the literature, allow us to estimatethe spectral index of the components and identify one of the compact componentsas the VLBI core based on its flat spectrum between 5 and 22 GHz. Relative tothis core component, the jet appears to be bi-directional. The proper motionmeasurement of the component C2 and the estimate of the Doppler boosting factorsuggest that the orientation of the jet is close to the line of sight. Theprojection effect of an intrinsically sharply bending jet within a few mas fromthe core or the erratic change in the nozzle direction of the jet may accountfor the uncommon bi-directional structure of the jet in J1625+4134.Comment: accepted by Ap

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