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Broad line region echo from highly accreting intermediate-mass black hole candidate SDSS J144850.08+160803.1. First probe of intra-night variability and reverberation mappingстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Demianenko Mariia, Afanasiev Anton V., Rubtsov Evgenii, Toptun Victoria, Pott Jörg-Uwe, Belinski Alexandr, Bauer Franz E., Chilingarian Igor V., Grishin Kirill A., Burlak Marina, Ikonnikova Natalia
- Журнал: Astronomy and Astrophysics
- Том: 702
- Год издания: 2025
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Номер статьи: A202
- DOI: 10.1051/0004-6361/202555139
- Аннотация: Context. Elusive intermediate-mass black holes (IMBHs) can act as ``time-squeezing'' machines, enabling studies of AGN geometry through reverberation mapping (RM) on much shorter timescales than their supermassive siblings. Aims. The broad line region (BLR) radius constraints for IMBH candidates with different Eddington ratios probe the unexplored faint end of radius--luminosity relations and allow us to build a robust estimator. This study aims to (a) confirm a rapidly accreting IMBH candidate; (b) demonstrate the feasibility of the first photometric BLR reverberation mapping (RM) campaign for this class of objects. Methods. The IMBH candidate J1448+16 was identified in the broad H -selected spectroscopic sample from SDSS. We carried out narrow-band H and broad-band SDSS~g\'~monitoring to check small-scale variability and extract the time lag between the BLR and accretion disk (AD) continuum during 5 months (March--July 2024) using a 60-cm telescope at the Caucasus Mountain Observatory. Results. We confirmed the candidate as an active IMBH using XMM-Newton as a bright X-ray point source with the photon index , suggesting the high accretion rate. From a combination of SDSS optical spectra and XMM-Newton observations, we estimate the black hole mass in the range and the Eddington rate from . We report high-amplitude intra-night ( ~h) H variability in this highly accreting IMBH. In addition, we extracted a tentative measurement of a BLR RM radius . Conclusions. This work is a proof of concept for further IMBH variability studies and BLR RM campaigns, which will be essential for the calibration of the relation at the faint end.
- Добавил в систему: Белинский Александр Александрович
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