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16950 results

Page 64 of 848

Star-Formation Rates of Galaxies
  • Edited by Andreas Zezas, Véronique Buat
  • Published online:
    11 May 2021
    Print publication:
    29 April 2021
  • Star-formation is one of the key processes that shape the current state and evolution of galaxies. This volume provides a comprehensive presentation of the different methods used to measure the intensity of recent or on-going star-forming activity in galaxies, discussing their advantages and complications in detail. It includes a thorough overview of the theoretical underpinnings of star-formation rate indicators, including topics such as stellar evolution and stellar spectra, the stellar initial mass function, and the physical conditions in the interstellar medium. The authors bring together in one place detailed and comparative discussions of traditional and new star-formation rate indicators, star-formation rate measurements in different spatial scales, and comparisons of star-formation rate indicators probing different stellar populations, along with the corresponding theoretical background. This is a useful reference for students and researchers working in the field of extragalactic astrophysics and studying star-formation in local and higher-redshift galaxies.

Detection of Light
  • 3rd edition
  • George H. Rieke
  • Published online:
    30 April 2021
    Print publication:
    13 May 2021
  • The invention and development of advanced methods to detect light underlies much of modern technology. This fully updated and restructured third edition is unique amongst the literature, providing a comprehensive, uniform discussion of a broad range of detection approaches. The material is accessible to a broad range of readers rather than just highly trained specialists, beginning with first principles and developing the relevant physics as it goes. The book emphasizes physical understanding of detector operation, without being a catalog of current examples. It is self-contained but also provides a bridge to more specialized works on specific approaches; each chapter points readers toward the relevant literature. This will provide a broad and lasting understanding of the methods for detecting light that underpin so much of our technology. The book is suitable for advanced undergraduate and graduate students, and will provide a valuable reference for professionals across physics and engineering disciplines.

  • 9 - Modelling the Spectral Energy Distribution of Star-Forming Galaxies with Radiative Transfer Methods

  • from Part II - SFR Measurements
  • Edited by Andreas Zezas, University of Crete, Véronique Buat, Université d'Aix-Marseille
  • Book:
    Star-Formation Rates of Galaxies
    Published online:
    11 May 2021
    Print publication:
    29 April 2021, pp 204-224

  • Summary

    Knowledge of the output and three dimensional distribution of all constituents of galaxies (stars of all ages, gas, dust, cosmic rays) is a prerequisite for understanding the process of star-formation along the cosmic time, and ultimately the formation and evolution of galaxies. However, what we measure is the spatial and spectral energy distribution (SED) of galaxies. In this chapter we describe self-consistent modeling of the SED involvingradiative transfer (RT) calculations that follow the interaction between stellar photons and dust particles, and make predictions for all emission mechanisms involved. Tracing the energy flow and accounting for the anisotropy of the problem requires modelling of SEDs spanning a broad range in wavelengths and the spatial distribution of the emission. A RT modelaccurately calculates the stellar SEDs emitted by the newly-formed stars by both calculating the effect of dust attenuation throughout the galaxy, and by providing a three dimensional picture of the stellar emission of these stars. This way it produces a solution for the SFR, and the 3D distributions of all stellar components of a galaxy (stars of all ages and from different morphological components, like disks, bulges, and bars) and of the dust distribution, giving us a detailed understanding of the make up of a galaxy, both of its stellar content and of the interstellar medium structure.

Page 64 of 848