Terahertz astronomy. (2015)

• Record Type: Book
• Further Information: Note: Christopher K. Walker.
• Authors: Walker, Christopher K (Christopher Kidd)
• Contents: The Interstellar Medium at Terahertz Frequencies; Introduction; ISM Components of the Milky Way; Lifecycle of the ISM; Probing the Lifecycle of the ISM; THz SEDs; Conclusion THz Radiative Transfer Basics and Line Radiation; Equation of Radiative Transfer; Solution to the Equation of Radiative Transfer under LTE (Local Thermodynamic Equilibrium); Radiative Transfer of Rotational Transitions of Linear Molecules in LTE; Non-LTE Approach; Conclusion THz Continuum Emission; Introduction; THz Spectral Energy Distributions; Deriving Dust Optical Depth, Column Density, and Mass; Temperature and Density Distributions; Dust Energy Balance in Clouds; Dust–Gas Coupling; Dust Polarization: Origin and Measurement; Conclusion Simple Radiative Transfer Model; Introduction; Geometry; Source Physical Conditions; Lines of Sight; Model Equation of Transfer; LTE Radiative Transfer with Hydrodynamic Simulations; Non-LTE Radiative Transfer with Hydrodynamic Simulations; Going Further THz Optical Systems; Introduction: Source-Beam Coupling; QED and Maxwell; Origin of a Single-Aperture Diffraction Pattern (QED); Gaussian Beam Optics; Focusing Gaussian Beams; Intercepting Gaussian Beams; Illuminating THz Telescopes; Conclusion THz Coherent Detection Systems; Introduction; Superheterodyne Receivers; Receiver Noise Temperature; Noise Temperature of THz Optical Systems; THz Mixer Architectures and Noise; IF Amplifiers ; Effective Temperature Measurement of THz Components; THz Mixers; THz Local Oscillators; Receiver Back-Ends; Receiver Stability and Allan Time; Heterodyne Array Considerations; Summary Incoherent Detectors; Introduction; Bolometer Basics; Semiconductor Bolometers; Superconducting Incoherent; Background Noise Limited Operation; Instrument Noise Limited Operation; Sensitivity Requirements; Comparing Heterodyne and Incoherent Detector Sensitivity; Incoherent Array Considerations; Conclusion THz Observing Techniques; Introduction; Observing Strategies; Receiver Calibration; Estimating Atmospheric Optical Depth; THz Brightness Temperature of Planetary Bodies; Conclusion THz Interferometry; Introduction; Simple Adding Interferometer; Phase Switched Interferometer; Correlation Interferometer; Phasor Equation for Interferometry; Aperture Synthesis of Extended Sources; Filling-in uv Space; Transforming the Visibility Function; Map Noise Level; Phase Closure or Self-Calibration; Phase Error at THz Frequencies Answers to Problems Appendix 1: Timeline of Thz Technology; Appendix 2: More Thz Transitions of Atoms and Molecules; Appendix 3: Commonly Used Physical and Astronomical Quantities; Appendix 4: Useful Radiative Transfer Expressions; Appendix 5: Commonly Used Quasi-Optical Expressions; Appendix 6: Useful Heterodyne Receiver Expressions References appear at the end of each chapter.
• Edition: 1st
• Publisher Details: Boca Raton : CRC Press
• Publication Date: 2015
• Extent: 1 online resource, illustrations (black and white, and colour)
• Subjects: 522.682; Radio astronomy
• Languages: English
• ISBNs: 9781466570436; 9781498742504
• Related ISBNs: 9781466570429
• Notes: Note: Includes bibliographical references and index.; Note: Description based on CIP data; item not viewed.
• Access Rights: Legal Deposit; Only available on premises controlled by the deposit library and to one user at any one time; The Legal Deposit Libraries (Non-Print Works) Regulations (UK).
• Access Usage: Restricted: Printing from this resource is governed by The Legal Deposit Libraries (Non-Print Works) Regulations (UK) and UK copyright law currently in force.