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Author: Peter Boorman Publisher: Springer Nature ISBN: 303060361X Category : Science Languages : en Pages : 327
Book Description
This thesis describes the application of state-of-the-art high-energy X-ray studies to the astronomical quest for understanding obscured active galactic nuclei (AGN). These AGN are supermassive black holes growing by accretion of matter located in the nuclei of galaxies. The material that feeds these black holes also obscures them from view, rendering them challenging to study. It is possible to study them by effectively 'X-raying' galactic nuclei to peer through these obscuring veils. Beginning with the proof-of-concept application of novel X-ray Monte Carlo codes to the Nuclear Spectroscopic Telescope ARray (NuSTAR) spectrum of a known heavily obscured AGN, the thesis establishes the relevant parameters that characterise the AGN spectrum and central black hole growth rate. Next the largest sample of known heavily obscured AGN is compiled, finding the strength of a prominent iron spectral feature to weaken with AGN power. This is puzzling, and suggests that there may be more hidden AGN than previously thought. Finally by combining an all-sky infrared selection with NuSTAR follow-up, new heavily obscured AGN are identified. Obscuration emits infrared radiation, meaning that the infrared-selected AGN catalogue should be representative of the underlying AGN population. The absence of such representative catalogues has continually plagued cosmological studies, and the resultant obscured AGN fraction will be strongly constraining for AGN models.
Author: Carl E. Baum Publisher: Routledge ISBN: 1351455656 Category : Technology & Engineering Languages : en Pages : 458
Book Description
Beginning with a review of the current need for identification of buried and surface unexplored ordnance such as mines, shells, bombs, this book then explains existing techniques for electromagnetic detection of such targets. A detailed treatment of target signatures (natural frequencies and related parameters) for identification and discrimination of false alarms is also given.
Author: Peter Boorman Publisher: Springer Nature ISBN: 303060361X Category : Science Languages : en Pages : 327
Book Description
This thesis describes the application of state-of-the-art high-energy X-ray studies to the astronomical quest for understanding obscured active galactic nuclei (AGN). These AGN are supermassive black holes growing by accretion of matter located in the nuclei of galaxies. The material that feeds these black holes also obscures them from view, rendering them challenging to study. It is possible to study them by effectively 'X-raying' galactic nuclei to peer through these obscuring veils. Beginning with the proof-of-concept application of novel X-ray Monte Carlo codes to the Nuclear Spectroscopic Telescope ARray (NuSTAR) spectrum of a known heavily obscured AGN, the thesis establishes the relevant parameters that characterise the AGN spectrum and central black hole growth rate. Next the largest sample of known heavily obscured AGN is compiled, finding the strength of a prominent iron spectral feature to weaken with AGN power. This is puzzling, and suggests that there may be more hidden AGN than previously thought. Finally by combining an all-sky infrared selection with NuSTAR follow-up, new heavily obscured AGN are identified. Obscuration emits infrared radiation, meaning that the infrared-selected AGN catalogue should be representative of the underlying AGN population. The absence of such representative catalogues has continually plagued cosmological studies, and the resultant obscured AGN fraction will be strongly constraining for AGN models.
Author: Publisher: ISBN: Category : Law reports, digests, etc Languages : en Pages : 1208
Book Description
Includes the decisions of the Supreme Courts of Missouri, Arkansas, Tennessee, and Texas, and Court of Appeals of Kentucky; Aug./Dec. 1886-May/Aug. 1892, Court of Appeals of Texas; Aug. 1892/Feb. 1893-Jan./Feb. 1928, Courts of Civil and Criminal Appeals of Texas; Apr./June 1896-Aug./Nov. 1907, Court of Appeals of Indian Territory; May/June 1927-Jan./Feb. 1928, Courts of Appeals of Missouri and Commission of Appeals of Texas.
Author: Peter Boorman
Author: Carl E. Baum
Author: Peter Boorman
Author: Forbes Benignus WINSLOW
Author: John Eric Erichsen
Author: United States. Hydrographic Office
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Author: American Society for Psychical Research
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