| A Peculiar Broad Line Radio Galaxy 1938-155： VLA Observation at 90 cm |
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| 引用本文： | Tao An,Xiao-Yu Hong,Wen-Xia Feng and Jun-Hui Zhao1 Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030, 2 National Astronomical Observatories,Chinese Academy of Sciences,Beijing 1000123 Harvard-Smithsonian Center for Astrophysics,60 Garden Street,MS 78,Cambridge,MA 02138. A Peculiar Broad Line Radio Galaxy 1938-155： VLA Observation at 90 cm[J]. 中国天文和天体物理学报, 2004, 4(6): 527-532 |
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| 作者姓名： | Tao An Xiao-Yu Hong Wen-Xia Feng and Jun-Hui Zhao1 Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 2 National Astronomical Observatories Chinese Academy of Sciences Beijing 1000123 Harvard-Smithsonian Center for Astrophysics 60 Garden Street MS 78 Cambridge MA 02138 |
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| 作者单位： | Tao An,Xiao-Yu Hong,Wen-Xia Feng and Jun-Hui Zhao1 Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030; 2 National Astronomical Observatories,Chinese Academy of Sciences,Beijing 1000123 Harvard-Smithsonian Center for Astrophysics,60 Garden Street,MS 78,Cambridge,MA 02138 |
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| 基金项目： | the National Natural Science Foundation of China. |
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| 摘 要： | We observed 1938-155, a broad line radio galaxy (BLRG), with the Very Large Array (VLA) at 90cm with an angular resolution of 6.8" × 4.0". The source consists of two components separated by 4 arcsec (- 20kpc, for H0 = 65km 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 (Sv ∝ v-α). The bright double components are surrounded by a low-brightness cocoon. The radio properties of the two bright components are consistent 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 30f77, 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.
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| 关 键 词： | 有线载波通信 银河系 VLA天文观测 类星体 连续统计 |
A Peculiar Broad Line Radio Galaxy 1938-155:VLA Observation at 90 cm |
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| Tao An,Xiao-Yu Hong,Wen-Xia Feng and Jun-Hui Zhao Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai , National Astronomical Observatories,Chinese Academy of Sciences,Beijing Harvard-Smithsonian Center for Astrophysics, Garden Street,MS ,Cambridge,MA. A Peculiar Broad Line Radio Galaxy 1938-155:VLA Observation at 90 cm[J]. Chinese Journal of Astronomy and Astrophysics, 2004, 4(6): 527-532 |
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| Authors: | Tao An Xiao-Yu Hong Wen-Xia Feng Jun-Hui Zhao Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai National Astronomical Observatories Chinese Academy of Sciences Beijing Harvard-Smithsonian Center for Astrophysics Garden Street MS Cambridge MA |
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| Affiliation: | Tao An,Xiao-Yu Hong,Wen-Xia Feng and Jun-Hui Zhao1 Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030, 2 National Astronomical Observatories,Chinese Academy of Sciences,Beijing 1000123 Harvard-Smithsonian Center for Astrophysics,60 Garden Street,MS 78,Cambridge,MA 02138 |
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| Abstract: | |
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| Keywords: | Galaxy: quasar: individual - radio continuum: VLA |
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