Lo, Wen-Ping and Asada, Keiichi and Matsushita, Satoki and Nakamura, Masanori and Pu, Hung-Yi and Tseng, Chihyin and Akiyama, Kazunori and Algaba, Juan Carlos and Bower, Geoffrey C. and Rao, Ramprasad and Koay, Jun Yi and Koch, Patrick M. and Koyama, Shoko and Ho, Paul T. P. and Inoue, Makoto (2021) Constraints on the mass accretion rate onto the supermassive black hole of cygnus : A using the Submillimeter Array. Astrophysical Journal, 911 (1). ISSN 0004-637X, DOI https://doi.org/10.3847/1538-4357/abd17b.
Full text not available from this repository.Abstract
We present the first detailed polarimetric studies of Cygnus A at 230 GHz with the Submillimeter Array (SMA) to constrain the mass accretion rate onto its supermassive black hole. We detected the polarized emission associated with the core at a fractional polarization of 0.73 +/- 0.15%. This low fractional polarization suggests that the polarized emission is highly depolarized. One of the possible explanations is due to a significant variance in the Faraday rotation measure within the synthesized beam. By assuming the Faraday depolarization caused by inhomogeneous column density of the magnetized plasma associated with the surrounding radiatively-inefficient accretion flow within the SMA beam, we derived the constraint on the mass accretion rate to be larger than 0.15 M-circle dot yr(-1) at the Bondi radius. The derived constraint indicates that an adiabatic inflow-outflow solution or an advection-dominated accretion flow should be preferable as the accretion flow model in order to explain the jet power of Cygnus A.
| Item Type: | Article |
|---|---|
| Funders: | Smithsonian Institution, Academia Sinica - Taiwan, Ministry of Science and Technology, Taiwan[MOST 105-2119-M-001-042], Ministry of Science and Technology, Taiwan[MOST 106-2119-M-001-013] |
| Uncontrolled Keywords: | Submillimeter Array (SMA);Supermassive black hole |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 31 May 2022 08:06 |
| Last Modified: | 31 May 2022 08:06 |
| URI: | http://eprints.um.edu.my/id/eprint/34637 |
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