{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/reverberation-mapping-of-two-luminous-quasars","title":"Reverberation Mapping of Two Luminous Quasars: the Broad-line Region Structure and Black Hole Mass","arxiv_id":"2106.05655","date":"2021-06-10","proceeding":null,"authors":["Sha-Sha Li","Sen Yang","Zi-Xu Yang","Yong-Jie Chen","Yu-Yang Songsheng","He-Zhen Liu","Pu Du","Bin Luo","Zhe Yu","Chen Hu","Bo-Wei Jiang","Dong-Wei Bao","Wei-Jian Guo","Zhi-Xiang Zhang","Yan-Rong Li","Ming Xiao","Kai-Xing Lu","Luis C. Ho","Jing-Min Bai","Wei-Hao Bian","Jesús Aceituno","Takeo Minezaki","Mitsuru Kokubo","Jian-Min Wang"],"abstract":"We report the results of a multi-year spectroscopic and photometric monitoring campaign of two luminous quasars, PG~0923+201 and PG~1001+291, both located at the high-luminosity end of the broad-line region (BLR) size-luminosity relation with optical luminosities above $10^{45}~{\\rm erg~s^{-1}}$. PG~0923+201 is for the first time monitored, and PG~1001+291 was previously monitored but our campaign has a much longer temporal baseline. We detect time lags of variations of the broad H$\\beta$, H$\\gamma$, Fe {\\sc ii} lines with respect to those of the 5100~{\\AA} continuum. The velocity-resolved delay map of H$\\beta$ in PG~0923+201 indicates a complicated structure with a mix of Keplerian disk-like motion and outflow, and the map of H$\\beta$ in PG~1001+291 shows a signature of Keplerian disk-like motion. Assuming a virial factor of $f_{\\rm BLR}=1$ and FWHM line widths, we measure the black hole mass to be $118_{-16}^{+11}\\times 10^7 M_{\\odot}$ for PG~0923+201 and $3.33_{-0.54}^{+0.62}\\times 10^7 M_{\\odot}$ for PG~1001+291. Their respective accretion rates are estimated to be $0.21_{-0.07}^{+0.06} \\times L_{\\rm Edd}\\,c^{-2}$ and $679_{-227}^{+259}\\times L_{\\rm Edd}\\,c^{-2}$, indicating that PG~0923+201 is a sub-Eddington accretor and PG~1001+291 is a super-Eddington accretor. While the H$\\beta$ time lag of PG~0923+201 agrees with the size-luminosity relation, the time lag of PG~1001+291 shows a significant deviation, confirming that in high-luminosity AGN the BLR size depends on both luminosity and Eddington ratio. Black hole mass estimates from single AGN spectra will be over-estimated at high luminosities and redshifts if this effect is not taken into account.","url_abs":"https://arxiv.org/abs/2106.05655v1","url_pdf":"https://arxiv.org/pdf/2106.05655v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"reverberation-mapping-of-two-luminous-quasars","repo_url":"https://github.com/PuDu-Astro/DASpec","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}