Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004chjaa...4..527a&link_type=abstract
Chinese Journal of Astronomy & Astrophysics, Vol. 4, p. 527-532
Astronomy and Astrophysics
Astrophysics
Galaxy: Quasar: Individual, Radio Continuum: Vla
Scientific paper
We observed 1938-155, a broad line radio galaxy (BLRG), with the Very Large Array (VLA) at 90 cm with an angular resolution of 6.8'' ×4.0''. The source consists of two components separated by 4 arcsec (˜ 20 kpc, for H0 = 65 km s-1 Mpc-1, q0=0.5) along the SE-NW direction. Both components show steep-spectra with a similar spectral index α˜ 0.83 ± 0.07 (Sν∝ν-α). The bright double components are surrounded by a low-brightness cocoon. The radio properties of the two bright components areconsistent with the hot spots produced by twin jets. An upper limit of ˜ 0.0008 for the core dominance parameter (R) is inferred, suggesting there is no prominent radio core in the source. Assuming a modest viewing angle 30 °, a jet velocity is estimated ˜ 0.07 c, based on the jet to counter-jet brightness ratio (J). The lower limit in jet speed inferred is consistent with no Doppler beaming effect on the jet. The radio galaxy 1938--155 could be an exceptional BLRG with no prominent radio core or jet.
An Tao
Feng Wen-Xia
Hong Xiao-Yu
Zhao Jun-Hui
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