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NGC 3259: A signal for an untapped population of slowly accreting intermediate-mass black holesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Grishin Kirill A., Chilingarian Igor V., Combes Francoise, Bauer Franz E., Toptun Victoria A., Katkov Ivan Yu, Fabricant Daniel, Kolganov Fedor, Graham Alister W.
- Журнал: Astronomy and Astrophysics
- Том: 702
- Год издания: 2025
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Номер статьи: A42
- DOI: 10.1051/0004-6361/202554130
- Аннотация: Low-mass active galactic nuclei (AGNs) can provide important constraints on the formation and evolution of supermassive black holes (SMBHs), a central challenge in modern cosmology. To date only small samples of intermediate-mass black holes (IMBHs, MBH<105M⊙) and 'lesser' supermassive black holes (LSMBHs, MBH<106M⊙) have been identified. Our present study of NGC 3259 at D=27 Mpc with the Binospec integral field unit spectrograph complemented with Keck Echelle Spectrograph and Imager observations demonstrates the need for and the power of the spectroscopic follow-up. NGC 3259 hosts a black hole with a mass of MBH=(1.7−4.1)×105M⊙, inferred from multi-epoch spectroscopic data, that accretes at 1% of the Eddington limit as suggested by the analysis of archival XMM-Newton observations. It is the second nearest low-mass AGN after the archetypal galaxy NGC 4395. The spectroscopic data reveals a variable broad Hα profile that is likely the result of asymmetrically distributed broad-line region (BLR) clouds or BLR outflow events. X-ray observations and the absence of an optical power-law continuum suggest partial obscuration of the accretion disk and hot corona by a dust torus. We estimate that the Sloan Digital Sky Survey could only detect similar objects to D=35 Mpc. A detailed photometric analysis of NGC 3259 using HST images provides a central spheroid stellar mass estimate 25 times lower than expected from the MBH−M∗sph relation, making this galaxy a strong outlier. This discrepancy suggests divergent growth pathways for the central black hole and spheroid, potentially influenced by the presence of a bar in the galaxy. Finally, we demonstrate that the DESI and 4MOST surveys will detect low-accretion rate IMBHs and LSMBHs and the sensitivity of future X-ray instruments (such as AXIS and Athena) will secure their classification.
- Добавил в систему: Чилингарян Игорь Владимирович