LIU Xiang1, C. Stanghellini2, D. Dallacasa3, M. Bondi4
1Urumqi Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Urumqi 830011
2Istituto di Radioastronomia del CNR, Noto, Italy
3Università di Bologna, Italy
4Istituto di Radioastronomia del CNR, Bologna, Italy
Detection of Proper Motion in OQ208?
LIU Xiang1;C. Stanghellini2;D. Dallacasa3;M. Bondi4
1Urumqi Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Urumqi 830011
2Istituto di Radioastronomia del CNR, Noto, Italy
3Università di Bologna, Italy
4Istituto di Radioastronomia del CNR, Bologna, Italy
Abstract： We report on an ongoing work aimed to detect the separation speed of the two hot-spots of the compact symmetric object OQ208. Comparing images at 8.4 GHz taken in 6 epoches between 1994 and 1997 we obtain an estimate of 0.058±0.038 mas/year as the relative motions between two components of the radio source. At the red-shift of OQ208 1 mas correspond to 1 pc, thus we obtain a projected jet speed of 0.095±0.062c. With an inclination of 45o between the jets and the line of sight, we have an actual jet velocity of 0.134±0.088c and therefore the kinematic age of the source is so young of 320±210 years.
(Active and peculiar galaxies and related systems (including BL Lacertae objects, blazars, Seyfert galaxies, Markarian galaxies, and active galactic nuclei))
引用本文:
LIU Xiang;C. Stanghellini;D. Dallacasa;M. Bondi. Detection of Proper Motion in OQ208?[J]. 中国物理快报, 2000, 17(4): 307-309.
LIU Xiang, C. Stanghellini, D. Dallacasa, M. Bondi. Detection of Proper Motion in OQ208?. Chin. Phys. Lett., 2000, 17(4): 307-309.
2000, Vol. 17 
