東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Linked to FindBook

Google Book

Amazon

博客來

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

Record Type:	Electronic resources : Monograph/item
Title/Author:	Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes./
Author:	Palumbo, Daniel.
Description:	1 online resource (226 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
Contained By:	Dissertations Abstracts International84-12B.
Subject:	Astrophysics. -
Online resource:	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.
LDR:02959nmm a2200373K 4500 001 2363038
005 20231109104741.5
006 m o d
007 cr mn ---uuuuu
008 241011s2023 xx obm 000 0 eng d
020 $a 9798379612573
035 $a (MiAaPQ)AAI30491073
035 $a AAI30491073
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Palumbo, Daniel. $3 3703784
245 1 0 $a Interferometric Measurement of the Magnetization and Spin of Supermassive Black Holes.
264 0 $c 2023
300 $a 1 online resource (226 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
500 $a Advisor: Johnson, Michael.
502 $a Thesis (Ph.D.)--Harvard University, 2023.
504 $a Includes bibliographical references
520 $a 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*.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Astrophysics. $3 535904
650 4 $a Astronomy. $3 517668
653 $a Black holes
653 $a Interferometry
653 $a Polarization
653 $a Supermassive black hole
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0596
690 $a 0606
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Harvard University. $b Astronomy. $3 3173874
773 0 $t Dissertations Abstracts International $g 84-12B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30491073 $z click for full text (PQDT)