Welcome to our book review site go-pdf.online!
You may have to Search all our reviewed books and magazines, click the sign up button below to create a free account.
What is the Structure of Relativistic Jets in AGN on Scales of Light Days?
The structure of relativistic jets in AGN on scales of light days reveals how energy propagates through jets, a process that is fundamental to galaxy evolution. A deeper understanding of jet physics will clarify the differences between radio-loud and radio-quiet quasars that manifest themselves near the supermassive black hole. We can also use relativistic jets to identify supermassive binary black holes remaining from galaxy mergers, and use orbital motion to derive the masses of the black holes. The search for binary black holes in the nuclei of galaxies will yield important information on their overall lifetime and on the processes occurring in galaxies that affect black holes and quasars. High-precision astrometric measurements, made using the technique of optical interferometry on a space-based platform, such as SIM Lite, are the key to answering these questions.
TANAMI
Context. A number of theoretical models vie to explain the [Greek letter gamma]-ray emission from active galactic nuclei (AGN). This was a key discovery of EGRET. With its broader energy coverage, higher resolution, wider field of view and greater sensitivity, the Large Area Telescope (LAT) of the Fermi Gamma-ray Space Telescope is dramatically increasing our knowledge of AGN [Greek letter gamma]-ray emission. However, discriminating between competing theoretical models requires quasi-simultaneous observations across the electromagnetic spectrum. By resolving the powerful parsec-scale relativistic outflows in extragalactic jets and thereby allowing us to measure critical physical properties,...
Highlights of Astronomy: Volume 14
Recording the proceedings of the IAU XXVI General Assembly, this volume of the IAU Highlights of Astronomy covers virtually all aspects of modern astrophysics as discussed by 2400 participants from 73 countries. Notably, the common aspects of astrophysical phenomena known to exist in widely differing interstellar environments is thoroughly examined, providing fertile cross correlation from one specialisation to another. This text highlights the importance of the triennial IAU General Assemblies in bringing together the work of observers and theoreticians in widely different fields, but working towards a common goal: understanding the physics of the Universe. Together with the Proceedings of the IAU Symposia 235-240, this volume examines all of the astrophysics presented at the General Assembly.
United States Naval Observatory Analysis Center for Source Structure Report
This report summarizes the activities of the United States Naval Observatory Analysis Center for Source Structure for calendar year 2009. VLBA RDV experiments RDV71 and RDV73 were calibrated and imaged. Images from these two experiments, together with images from RDV25 were added to the USNO Radio Reference Frame Image Database. VLBA high frequency (K/Q-band) experiment BL151a was calibrated and imaged. A Southern Hemisphere imaging and astrometry program for maintenance of the ICRF continued. Activities planned for the year 2010 include continued imaging of ICRF sources at standard and higher frequencies and continued analysis of source structure and its variation.
Highlights of Astronomy
Vol. 1- contain papers, etc., from 13th- General Assembly.
The Last Stargazers
SHORTLISTED FOR THE ROYAL SOCIETY SCIENCE BOOK PRIZE 2021 FINALIST FOR THE PEN/E.O. WILSON LITERARY SCIENCE WRITING AWARD AN AMAZON BEST BOOK OF 2020 To be an astronomer is to journey to some of the most inaccessible parts of the globe, braving mountain passes, sub-zero temperatures, and hostile flora and fauna. Not to mention the stress of handling equipment worth millions. It is a life of unique delights and absurdities … and one that may be drawing to a close. Since Galileo first pointed his telescope at the heavens, astronomy has stood as a fount of human creativity and discovery, but soon it will be the robots gazing at the sky while we are left to sift through the data. In The Last Stargazers, Emily Levesque reveals the hidden world of the professional astronomer. She celebrates an era of ingenuity and curiosity, and asks us to think twice before we cast aside our sense of wonder at the universe.
U.S. Naval Observatory VLBI Analysis Center
This report summarizes the activities of the VLBI Analysis Center at the United States Naval Observatory for calendar year 2010. Over the course of the year, Analysis Center personnel continued analysis and timely submission of IVS-R4 databases for distribution to the IVS. During the 2010 calendar year, the USNO VLBI Analysis Center produced one periodic global Terrestrial Reference Frame (TRF) solution for internal use only. Earth orientation parameters (EOP), updated by the latest diurnal (IVS-R1 and IVS-R4) experiments, were routinely submitted to the IVS. Sinex files based upon the bi-weekly 24-hr experiments were also submitted to the IVS. During the 2010 calendar year, Analysis Center personnel focused much of their efforts on both the DiFX software correlator implementation at USNO and on establishing a program of daily intensive experiments to measure UT1-UTC using two stations of the Very Long Baseline Array (VLBA). Analysis Center personnel also continued research into future high-frequency celestial reference frames based upon the VLBA K/Q-band experiments.
Microarcsecond Scintillation-induced Variability (MASIV) Survey of the Northern Sky
We present the results of a large-scale 5-GHz Very Large Array (VLA) survey of the northern sky searching for sources that exhibit intraday variability (IDV).
