分类： 天文学 >> 天文学 提交时间： 2023-02-19
Dong-Wei Bao
Michael S. Brotherton
Pu Du
Jacob N. McLane
T. E. Zastrocky
Kianna A. Olson
Feng-Na Fang
Shuo Zhai
Zheng-Peng Huang
Kai Wang
Bi-Xuan Zhao
Sha-Sha Li
Sen Yang
Yong-Jie Chen
Jun-Rong Liu
Zhu-Heng Yao
Yue-Chang Peng
Wei-Jian Guo
Yu-Yang Songsheng
Yan-Rong Li
摘要： In this third paper of the series reporting on the reverberation mapping (RM) campaign of active galactic nuclei with asymmetric H$\beta$ emission-line profiles, we present results for 15 Palomar-Green (PG) quasars using spectra obtained between the end of 2016 to May 2021. This campaign combines long time spans with relatively high cadence. For 8 objects, both the time lags obtained from the entire light curves and the measurements from individual observing seasons are provided. Reverberation mapping of 9 of our targets has been attempted for the first time, while the results for 6 others can be compared with previous campaigns. We measure the H$\beta$ time lags over periods of years and estimate their black hole masses. The long duration of the campaign enables us to investigate their broad line region (BLR) geometry and kinematics for different years by using velocity-resolved lags, which demonstrate signatures of diverse BLR geometry and kinematics. The BLR geometry and kinematics of individual objects are discussed. In this sample, the BLR kinematics of Keplerian/virialized motion and inflow is more common than outflow.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
摘要： We use 38 C IV quasar (QSO) reverberation-mapped (RM) observations, which span eight orders of magnitude in luminosity and the redshift range $0.001064 \leq z \leq 3.368$, to simultaneously constrain cosmological-model and QSO radius-luminosity ($R-L$) relation parameters in six cosmological models, using an improved technique that more correctly accounts for the asymmetric errors bars of the time-lag measurements. We find that $R-L$ relation parameters are independent of the cosmological models used in the analysis and so the $R-L$ relation can be used to standardize the C IV QSOs. The C IV QSO cosmological constraints are consistent with those from Mg II QSOs, allowing us to derive joint C IV + Mg II QSO cosmological constraints which are consistent with currently accelerated cosmological expansion, as well as consistent with cosmological constraints derived using better-established baryon acoustic oscillation (BAO) and Hubble parameter [$H(z)$] measurements. When jointly analyzed with $H(z)$ + BAO data, current C IV + Mg II QSO data mildly tighten current $H(z)$ + BAO data cosmological constraints.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Bo-Wei Jiang
Paola Marziani
Đorđe Savić
Elena Shablovinskaya
Luka Č. Popović
Victor L. Afanasiev
Bożena Czerny
Jian-Min Wang
Ascensión del Olmo
Mauro D'Onofrio
Marzena Śniegowska
Paola Mazzei
Swayamtrupta Panda
摘要： The quasar Main Sequence (MS) appears to be an incredibly powerful tool to organize the diversity in large samples of type-1 quasars but the most important physical parameters governing it are still unclear. Here we investigate the origin of the broadening and of a defining feature of Population B sources: a strong redward asymmetry of the Balmer emission lines. We focus on a prototypical source, Fairall 9. Spectropolarimetric data of the Fairall 9 broad H$\beta$ and H$\alpha$ profiles allowed for a view of the geometric and dynamical complexity of the line emitting regions. Measurements (1) provided evidence of rotational motion; (2) were helpful to test the presence of polar and equatorial scatterers, and their association with non-virial motions.
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