ブラックホールの朝食の余韻を解釈する(Interpreting the afterglow of a black hole’s breakfast)

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2023-12-05 カーディフ大学

◆カーディフ大学の科学者による研究では、136銀河の中心にある活動的なブラックホールが、周囲の銀河物質の食欲にかかわらず、マイクロ波とX線光で同様に輝いていることが分かりました。これまでの理解から予測されていない現象であり、これらのブラックホールは食欲にかかわらず共通の特徴を持つ可能性が浮上しています。
◆研究結果は銀河の進化に新たな情報を提供し、ブラックホールの質量推定にも新たな手法を提示しています。銀河内のブラックホールは小さいが、その影響は銀河全体に及び、これに関する謎に研究者が挑戦しています。

<関連情報>

ミリメートル波長におけるブラックホール降着の基本面 A fundamental plane of black hole accretion at millimetre wavelengths

Ilaria Ruffa, Timothy A Davis, Jacob S Elford, Martin Bureau, Michele Cappellari, Jindra Gensior, Daryl Haggard, Satoru Iguchi, Federico Lelli, Fu-Heng Liang,Lijie Liu, Marc Sarzi, Thomas G Williams, Hengyue Zhang
Monthly Notices of the Royal Astronomical Society: Letters  Published::05 December 2023
DOI:https://doi.org/10.1093/mnrasl/slad167

Correlation between MBH and Lν, mm (left panel) and edge-on view of the MBH–LX, 2–10–Lν, mm correlation (right panel) for the primary sample galaxies. In both panels, filled blue circles show sources with dynamical MBH measurements, open circles sources with MBH from the MBH – σ⋆ relation of van den Bosch (2016). Error bars are plotted for all points but some are smaller than the symbol used. The best-fitting power laws are overlaid as a black solid lines, the observed scatter as black dashed lines. The correlation coefficients ρ and p-values of the performed Spearman rank analysis are reported in the top left corner of each panel.

ABSTRACT

We report the discovery of the ‘mm fundamental plane of black hole accretion’, which is a tight correlation between the nuclear 1 mm luminosity (Lν, mm), the intrinsic 2–10 keV X-ray luminosity (LX, 2–10) and the supermassive black hole (SMBH) mass (MBH) with an intrinsic scatter (σint) of 0.40 dex. The plane is found for a sample of 48 nearby galaxies, most of which are low-luminosity active galactic nuclei. Combining these sources with a sample of high-luminosity (quasar-like) nearby AGN, we show that the plane still holds. We also find that MBH correlates with Lν, mm at a highly significant level, although such correlation is less tight than the mm fundamental plane (σint = 0.51 dex). Crucially, we show that spectral energy distribution (SED) models for both advection-dominated accretion flows (ADAFs) and compact jets can explain the existence of these relations, which are not reproduced by the standard torus-thin accretion disc models usually associated to quasar-like AGN. The ADAF models reproduces the observed relations somewhat better than those for compact jets, although neither provides a perfect fit. Our findings thus suggest that radiatively inefficient accretion processes such as those in ADAFs or compact (and thus possibly young) jets may play a key role in both low- and high-luminosity AGN. This mm fundamental plane also offers a new, rapid method to (indirectly) estimate SMBH masses.

1701物理及び化学
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