Multi-wavelength Observations of High-Accretion Rate Type 1 Active Galactic Nuclei and Other Super Soft X-ray Sources PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Multi-wavelength Observations of High-Accretion Rate Type 1 Active Galactic Nuclei and Other Super Soft X-ray Sources PDF full book. Access full book title Multi-wavelength Observations of High-Accretion Rate Type 1 Active Galactic Nuclei and Other Super Soft X-ray Sources by Mark Simpson. Download full books in PDF and EPUB format.
Author: Mark Simpson Publisher: ISBN: Category : Languages : en Pages :
Book Description
The study of X-ray emission from AGN allows the investigation of the inner regions of their central engine. By understanding the processes taking place within AGN, many other areas of research will benefit, such as accretion and the formation and evolution of galaxies. This thesis begins by investigating the background AGN population of the serendipitous sources detected in a deep-look (~ 500 ks) of the XMM-Newton field of view surrounding 3C 273. The deep-look is created by mosaicing XMM-Newton EPIC calibration observations of 3C 273. Time averaged spectra of the 17 brightest X-ray sources are analysed. Cross-correlation of the X-ray sources with catalogues at other wavelengths is performed and unique candidate counterparts proposed. Classification of the X-ray sources is attempted and the background AGN population is discussed. A number of AGN have shown evidence of high-ionisation, high-velocity outflows in their X-ray spectra. These sources are believed to have a high-accretion rate at or near the Eddington limit. Six suspected high-accretion rate narrow line AGN observed with XMM-Newton are analysed and inspected for the presence of these outflows. No such outflows are detected. However, three of the targets did show evidence of mass loss in the form of a warm absorber. In addition, all of the sources appear to have a soft excess below ~2 keV. Finally, a search for the AGN population of super soft X-ray sources (SSXs) in the first and second XMM-Newton catalogues is performed. Hardness ratios are used to search for SSXs, which are defined as having a characteristic temperature, kT>~100 eV. Cross-correlation of the selected SSXs with catalogues at other wavelengths is performed, returning both Galactic and extragalactic candidate counterparts. For a small number of SSXs with previously unclassified optical candidate counterparts, optical spectroscopic observations were acquired. The analysis of these observations identified 5 previously unclassified AGN.
Author: Mark Simpson Publisher: ISBN: Category : Languages : en Pages :
Book Description
The study of X-ray emission from AGN allows the investigation of the inner regions of their central engine. By understanding the processes taking place within AGN, many other areas of research will benefit, such as accretion and the formation and evolution of galaxies. This thesis begins by investigating the background AGN population of the serendipitous sources detected in a deep-look (~ 500 ks) of the XMM-Newton field of view surrounding 3C 273. The deep-look is created by mosaicing XMM-Newton EPIC calibration observations of 3C 273. Time averaged spectra of the 17 brightest X-ray sources are analysed. Cross-correlation of the X-ray sources with catalogues at other wavelengths is performed and unique candidate counterparts proposed. Classification of the X-ray sources is attempted and the background AGN population is discussed. A number of AGN have shown evidence of high-ionisation, high-velocity outflows in their X-ray spectra. These sources are believed to have a high-accretion rate at or near the Eddington limit. Six suspected high-accretion rate narrow line AGN observed with XMM-Newton are analysed and inspected for the presence of these outflows. No such outflows are detected. However, three of the targets did show evidence of mass loss in the form of a warm absorber. In addition, all of the sources appear to have a soft excess below ~2 keV. Finally, a search for the AGN population of super soft X-ray sources (SSXs) in the first and second XMM-Newton catalogues is performed. Hardness ratios are used to search for SSXs, which are defined as having a characteristic temperature, kT>~100 eV. Cross-correlation of the selected SSXs with catalogues at other wavelengths is performed, returning both Galactic and extragalactic candidate counterparts. For a small number of SSXs with previously unclassified optical candidate counterparts, optical spectroscopic observations were acquired. The analysis of these observations identified 5 previously unclassified AGN.
Author: Qingling Ni Publisher: ISBN: Category : Languages : en Pages :
Book Description
X-ray surveys are an effective way to study growing supermassive black holes (SMBHs) in galaxy centers, as actively accreting SMBHs manifest themselves as active galactic nuclei (AGN) that can be observed in the X-ray in most cases. Through studying AGNs in X-ray survey fields that have extensive multiwavelength data coverage, we can probe how SMBH growth links with their host galaxies over cosmic history. Previously, researchers mainly linked SMBH growth with stellar mass (M⋆) or star formation rate (SFR). In this dissertation, we utilize morphological information to show that among star-forming (SF) galaxies, long-term average SMBH accretion rate (BHAR) relates to host-galaxy compactness (Chapter 2). We found that the relation between BHAR and host-galaxy compactness is more fundamental than the relation between BHAR and M⋆ or SFR (Chapter 3). This dissertation also provides key results from the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS), which will benefit studies of SMBH growth in the next decade with a large sample of AGNs that have superb multiwavelength data. The detection of X-ray point sources in two of the XMM-SERVS survey fields is presented in Chapter 4. In Chapter 5, multiwavelength counterpart identification, photometric-redshift calculation, and source classification for X-ray sources in the XMM-SERVS survey fields are presented; most of the X-ray point-like sources detected are classified as AGNs, showing SMBH growth over the full range of cosmic environments. A Hyper Suprime-Cam (HSC) forced-photometry catalog that provides optical coverage for one of the XMM-SERVS survey fields is presented in Chapter 6. Apart from these works that focus on "Active Galactic Nuclei Studies in Cosmic X-ray Survey Fields", this dissertation also includes my other two first-author works in the appendices, where X-ray observational studies of weak-line quasars (WLQs) are presented. By studying these quasars with exceptional spectroscopic properties, we found good supporting evidence for optically thick inner accretion disks among quasars with high Eddington ratios.
Author: Bradley M. Peterson Publisher: ISBN: Category : Science Languages : en Pages : 568
Book Description
Annotation Papers from a June 2000 meeting discuss multiwavelength monitoring methods for studying active galactic nuclei, the potential of dedicated facilities for multiwavelength monitoring, and future multiwavelength programs. Some topics discussed are multiwavelength observations of blazars, time delays of blazar flares observed at different wavebands, low radiative-efficiency accretion flows, spectrochronography, and variability of the intrinsic UV absorption lines in Seyfert galaxies. Other topics are the variable diffuse continuum emission of broad-line clouds, the MIDEX concept, and the mission. Peterson teaches astronomy at The Ohio State University. This volume lacks a subject index. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Author: Astronomisches Recheninstitut Publisher: Springer Science & Business Media ISBN: 3662123797 Category : Science Languages : en Pages : 1456
Book Description
"Astronomy and Astrophysics Abstracts" appearing twice a year has become oneof the fundamental publications in the fields of astronomy, astrophysics andneighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world.
Author: D. Kunth Publisher: World Scientific ISBN: 9789810246167 Category : Science Languages : en Pages : 396
Book Description
A group of leading experts in the field of starbursts and active galactic nuclei have joined hands to produce this review volume which covers the starburst-AGN connection, and the tests to be carried out with the upcoming new astronomical facilities to ascertain the relevance of both components to the formation and evolution of galaxies.The book is addressed to advanced graduate students and researchers in the fields of active galactic nuclei and young galaxies.
Author: Mark Simpson
Author: Mark Simpson
Author: Xavier Barcons
Author: Qingling Ni
Author: Bradley M. Peterson
Author: Takamitsu Miyaji
Author: Tobias Beuchert
Author: Astronomisches Recheninstitut
Author: Rebecca Jane Smith
Author: D. Kunth
Author: T. Courvoisier