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Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes./
作者:	Palumbo, Daniel.
面頁冊數:	1 online resource (226 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
Contained By:	Dissertations Abstracts International84-12B.
標題:	Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30491073click for full text (PQDT)
ISBN:	9798379612573

Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes.
Palumbo, Daniel.

Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes. - 1 online resource (226 pages)

Source: Dissertations Abstracts International, Volume: 84-12, Section: B.

Thesis (Ph.D.)--Harvard University, 2023.

Includes bibliographical references

Supermassive black hole (SMBH) event horizons are now observationally accessible. The Event Horizon Telescope (EHT) has recently imaged the two known black holes of largest angular size with very-long-baseline interferometry (VLBI): that in Messier 87 (M 87*), and in our own Galactic Center (Sgr A*). In this thesis, I develop observational and theoretical tools for studies of synchrotron emission from SMBH accretion flows. Together, these results yield promising pathways to measurements of black hole spin and the accretion magnetization state, crucial properties that encode the accretion and merger history of the black hole. First, I specify a Fourier decomposition of rotational polarization structure in images of modestly inclined accretion flows. I find that spiral structure in synchrotron polarization directly probes both accretion magnetization and spin. Next, I demonstrate that lensing symmetries of the Penrose-Walker constant in axisymmetric equatorial flows simplify to a polarization B-mode antisymmetry that is apparent in the strongly lensed "photon rings" of favored simulations for M 87* and Sgr A*. I then propose a VLBI experiment that could use these symmetries to detect the photon ring. Finally, I develop a semi-analytic equatorial disk model for optically thin accretion flows. I embed this model in an inference framework to measure black hole mass, spin, inclination, and magnetic field geometry directly from interferometric data. I conclude with an overview of recent and forthcoming observational results using these techniques, including the EHT's measurement of the magnetization state of M 87*.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379612573Subjects--Topical Terms:

535904
Astrophysics.
Subjects--Index Terms:

Black holesIndex Terms--Genre/Form:

542853
Electronic books.

Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes.
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