Probing the origin of the two-component structure of broad-line region by reverberation mapping of an extremely variable quasar

Nagoshi, Shumpei; Iwamuro, Fumihide; Yamada, Satoshi; Ueda, Yoshihiro; Oikawa, Yuto; Otsuka, Masaaki; Isogai, Keisuke; Mineshige, Shin

doi:10.1093/mnras/stae319

Title: Probing the origin of the two-component structure of broad-line region by reverberation mapping of an extremely variable quasar

Journal Article · 08 February 2024 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stae319 · OSTI ID:2318602

;

; Oikawa, Yuto;

;

; Mineshige, Shin

ABSTRACT The physical origins of quasar components, such as the broad-line region (BLR) and dust torus, remain under debate. To gain insights into them, we focused on changing-state quasars (CSQs) which provide a unique perspective through structural changes associated with accretion disc state transitions. We targeted SDSS J125809.31+351943.0, an extremely variable CSQ, to study its central core structure and kinematics. We conducted reverberation mapping with optical spectroscopy to explore the structure of the BLR and estimate the black hole mass. The results from Hβ reverberation mapping indicated a black hole mass of $$10^{9.64^{+0.11}_{-0.20}}\rm {M_\odot }$$. Additionally, we analysed variations in the optical to X-ray spectral indices, αox, before and after the state transition, to investigate the accretion disc. These variations in αox and the Eddington ratio (from 0.4 per cent to 2.4 per cent) exhibitied behaviour similar to state transitions observed in X-ray binary systems. Spectral analysis of Hβ revealed a predominantly double-peaked profile during dim periods, transitioning to include a single-peaked component as the quasar brightened, suggesting that Hβ contains a mixture of two components. Each of these components has its distinct characteristics: the first is a double-peaked profile that remains stable despite changes in the accretion rate, while the second is a variable single-peaked profile. Using time-lags from reverberation mapping, we estimated the spatial relationships between these BLR components, the accretion disc, and the dust torus. Our results suggest that the BLR consists of two distinct components, each differing in location and origin.

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Sponsoring Organization:: USDOE

OSTI ID:: 2318602

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 529; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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