자료유형  

 학위논문

Control Number  

0016932294

International Standard Book Number  

9798379612573

Dewey Decimal Classification Number  

523

Main Entry-Personal Name  

Palumbo, Daniel.

Publication, Distribution, etc. (Imprint  

[S.l.] : Harvard University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(226 p.)

General Note  

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

General Note  

Advisor: Johnson, Michael.

Dissertation Note  

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

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약Supermassive 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*.

Subject Added Entry-Topical Term  

Astrophysics.

Subject Added Entry-Topical Term  

Astronomy.

Index Term-Uncontrolled  

Black holes

Index Term-Uncontrolled  

Interferometry

Index Term-Uncontrolled  

Polarization

Index Term-Uncontrolled  

Supermassive black hole

Added Entry-Corporate Name  

Harvard University Astronomy

Host Item Entry  

Dissertations Abstracts International. 84-12B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

로그인을 한후 보실 수 있는 자료입니다.

Control Number  

joongbu:639350