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著者: Izumi, Takuma
Kawakatu, Nozomu
Kohno, Kotaro
キーワード: galaxies: active
galaxies: ISM
ISM: molecules
発行日: 2016年8月10日
出版者: IOP Publishing
掲載誌情報: Takuma Izumi, Nozomu Kawakatu, and Kotaro Kohno, "Do Circumnuclear Dense Gas Disks Drive Mass Accretion onto Supermassive Black Holes?", The Astrophysical Journal Online Edition: 2016/08/10 (Japan time), doi:10.3847/0004-637X/827/1/81.
関連URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/dense-molecular-gas-disks-drive-the-growth-of-supermassive-black-holes.html
抄録: We present a positive correlation between the mass of dense molecular gas (Mdense) of ~ 100 pc scale circumnuclear disks (CNDs) and the black hole mass accretion rate (M_ BH) in total 10 Seyfert galaxies, based on data compiled from the literature and an archive (median aperture θmed = 220 pc). A typical Mdense of CNDs is 107-8 M⊙, estimated from the luminosity of the dense gas tracer, the HCN(1 -0) emission line. Because dense molecular gas is the site of star formation, this correlation is virtually equivalent to the one between nuclear star formation rate and M_ BH revealed previously. Moreover, the Mdense -M_ BH correlation was tighter for CND-scale gas than for the gas on kpc or larger scales. This indicates that CNDs likely play an important role in fueling black holes, whereas >kpc scale gas does not. To demonstrate a possible approach for studying the CND-scale accretion process with the Atacama Large Millimeter/submillimeter Array (ALMA), we used a mass accretion model where angular momentum loss due to supernova explosions is vital. Based on the model prediction, we suggest that only the partial fraction of the mass accreted from the CND (M_ acc) is consumed as M_ BH. However, M_ acc agrees well with the total nuclear mass flow rate (i.e., M_ BH + outflow rate). Although these results are still tentative with large uncertainties, they support the view that star formation in CNDs can drive mass accretion onto supermassive black holes in Seyfert galaxies.
内容記述: UTokyo Research掲載「銀河中心にある高い密度の分子ガス円盤が超巨大ブラックホールを育てる」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/dense-molecular-gas-disks-drive-the-growth-of-supermassive-black-holes.html
UTokyo Research "Dense molecular gas disks drive the growth of supermassive black holes" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/dense-molecular-gas-disks-drive-the-growth-of-supermassive-black-holes.html
URI: http://hdl.handle.net/2261/60925
出現カテゴリ:014 自然科学
1154010 学術雑誌論文


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