分类： 天文学 >> 天文学 提交时间： 2023-02-19
Leonid I. Gurvits
Sándor Frey
Máté Krezinger
Oleg Titov
Tao An
Yingkang Zhang
Alexander G. Polnarev
Krisztina É. Gabányi
Krisztina Perger
Alexey Melnikov
摘要： We present and briefly discuss results of several studies of the source J2102+6015 with tentatively defined redshift z=4:575 which demonstrates unusual properties in imaging and astrometric VLBI observations. Its properties might be considered as indications on the supermassive black hole binary which can be considered as a so far rare example of a high-redshift source of known electromagnetic and, possibly, predictable gravitational wave emissions.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Yingkang Zhang
Tao An
Sándor Frey
Xiaolong Yang
Máté Krezinger
Oleg Titov
Alexey Melnikov
Pablo de Vicente
Fengchun Shu
Ailing Wang
摘要： Jets of high-redshift active galactic nuclei (AGNs) can be used to directly probe the activity of the black holes in the early Universe. Radio sources with jets misaligned with respect to the line of sight are expected to dominate the high-redshift AGN population. In this paper, we present the high-resolution imaging results of a z=4.57 AGN J2102+6015 by analyzing its multi-epoch dual-frequency very long baseline interferometry (VLBI) data. The 8.4-GHz VLBI images reveal two major features along the east-west direction separated by $\sim$ 10 milli-arcsec (mas). From the spectral index map, both features show flat/inverted spectra. The separation between the two features remains almost unchanged over an observation period of $\sim$ 13 years, placing an upper limit of the separation speed as about 0.04 mas year$^{-1}$. Previous studies have classified the source as a GHz-peaked spectrum quasar. Our results indicate that J2102+6015 is most likely a young, compact symmetric object rather than a blazar-type core-jet source.
点击量
待评议
点击量
下载量
评论
