Lunch talk on Jun. 8, 2020

A 10-yr RM observation of 3C 273  

Speaker: Zhixiang Zhang (XMU)

Venue: Video conference

Time: 12:30 PM, Monday, Jun. 8, 2020

Abstract: 

We report a reverberation mapping campaign of 3C 273 carried out from 2008 November to 2018 March. The long-term and high SNR light curves allow us to measure the time lags between emission lines and the variable continuum in high precision. The time lag of variations in Hβ relative to those of the 5100 Å continuum is 146.8_{-12.1}^{+8.3} days in the rest frame. The time lag of the Hγ emission line is found to be nearly the same as that for Hβ. The lag of the Fe II emission is 322.0_{-57.9}^{+55.5} days, longer by a factor of ∼2 than that of the Balmer lines. The velocity-resolved lag measurements of the Hβ line show a complex structure that can be possibly explained by a rotation-dominated disk with some inflowing radial velocity in the Hβ-emitting region. A long trend was found between the continuum light-curve and emission-line light-curves, which can be explained as the contribution of Jet. The time lags of Balmer emission lines in this campaign agree very well with the Paschen-α region measured by the GRAVITY at The Very Large Telescope Interferometer, which is a good mutual verification of RM and GRAVITY results.

Report PPT:  SWIFAR_Zhixiang Zhang.pdf