Emergences of C iv narrow absorption troughs in the quasar SDSS J095254.10 021932.8

作者：Chen, Zhi Fu^*; Li, Mu Sheng; Huang, Wei Rong; Pan, Cai Juan; Li, You Bing

来源：Monthly Notices of the Royal Astronomical Society, 2013, 434(4): 3275-3282.

DOI：10.1093/mnras/stt1247

• galaxies: active
• quasars: absorption lines
• quasars: individual: J095254.10 021932.8

In this paper, we report on two C iv narrow absorption systems emerging from the spectrum of the quasar SDSS J095254.10 021932.8, which are located at z(abs) = 2.0053 and z(abs) = 1.8011, respectively. These features have velocity offsets of similar to 13 800 and similar to 34 700 km s(-1) with respect to the quasar, and show obviously partial coverage to the background emission sources. The two C iv absorption systems are imprinted on the spectrum obtained by the Sloan Digital Sky Survey (SDSS) III on 2011 March 25, which cannot be observed from the spectrum obtained by SDSS-I/II on 2000 December 30. The time interval of the two SDSS observations is 1186.4 d at the quasar rest frame. Because the continuum radiation, broad emission lines and mass accretion rate are stable for the two observations, together with the time interval of observations, we believe that the observed spectral variations are less likely to be caused by the changes in the ionization states of the absorbing gas or by a new outflow, arising from the situation where there was previously no outflow at all. Instead, they probably arise from the motions of multiple streaming gas across the sightline of the quasar.

• 出版日期2013-10
• 单位百色学院; 广州大学