A Statistical And Multi Wavelength Study Of Star Formation In Galaxies
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A Statistical And Multi Wavelength Study Of Star Formation In Galaxies
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Author : Corentin Schreiber
language : en
Publisher: Springer
Release Date : 2016-09-12
A Statistical And Multi Wavelength Study Of Star Formation In Galaxies written by Corentin Schreiber and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-12 with Science categories.
This thesis presents a pioneering method for gleaning the maximum information from the deepest images of the far-infrared universe obtained with the Herschel satellite, reaching galaxies fainter by an order of magnitude than in previous studies. Using these high-quality measurements, the author first demonstrates that the vast majority of galaxy star formation did not take place in merger-driven starbursts over 90% of the history of the universe, which suggests that galaxy growth is instead dominated by a steady infall of matter. The author further demonstrates that massive galaxies suffer a gradual decline in their star formation activity, providing an alternative path for galaxies to stop star formation. One of the key unsolved questions in astrophysics is how galaxies acquired their mass in the course of cosmic time. In the standard theory, the merging of galaxies plays a major role in forming new stars. Then, old galaxies abruptly stop forming stars through an unknown process. Investigating this theory requires an unbiased measure of the star formation intensity of galaxies, which has been unavailable due to the dust obscuration of stellar light.
Physics Of The Formation And Evolution Of Galaxies
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Author : Tsutomu Takeuchi
language : en
Publisher: Springer
Release Date : 2023-06-13
Physics Of The Formation And Evolution Of Galaxies written by Tsutomu Takeuchi and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-13 with Science categories.
This book introduces various physical processes related to the formation and evolution of galaxies, such as gravitation, electromagnetism, statistical physics, condensed matter, non-equilibrium processes, and relativity. Real data are analyzed using statistical methods and theoretical understanding. These topics give students and researchers in other fields a cross-sectional, interdisciplinary review. In particular, the author puts a great emphasis on multi-wavelength observations and surveys, which are now fundamental to understand the physics of any kind of cosmological and galactic comprehensive study. This is the first book to look at multi-wavelength surveys from the view of both observation and theory. This book is intended to be a standard guide to the physics of galaxy formation and evolution, which is popular in astrophysics but is not dealt with in detail in other books for young graduate students and non-experts in physics. Physical processes related to the formation and evolution of stars in galaxies are particularly mentioned from the view of multi-wavelength observations, which leads to an understanding of how the current universe has developed.
Multiwavelength Mapping Of Galaxy Formation And Evolution
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Author : Alvio Renzini
language : en
Publisher: Springer Science & Business Media
Release Date : 2005-05-23
Multiwavelength Mapping Of Galaxy Formation And Evolution written by Alvio Renzini and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-05-23 with Science categories.
The possibilities of astronomical observation have dramatically increased over the last decade. Major satellites, like the Hubble Space Telescope, Chandra and XMM Newton, are complemented by numerous large ground-based observatories, from 8m-10m optical telescopes to sub-mm and radio facilities. As a result, observational astronomy has access to virtually the whole electromagnetic spectrum of galaxies, even at high redshifts. Theoretical models of galaxy formation and cosmological evolution now face a serious challenge to match the plethora of observational data. In October 2003, over 170 astronomers from 15 countries met for a 4-day workshop to extensively illustrate and discuss all major observational projects and ongoing theoretical efforts to model galaxy formation and evolution. This volume contains the complete proceedings of this meeting and is therefore a unique and timely overview of the current state of research in this rapidly evolving field.
Star Formation Rates Of Galaxies
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Author : Andreas Zezas
language : en
Publisher: Cambridge University Press
Release Date : 2021-06-30
Star Formation Rates Of Galaxies written by Andreas Zezas and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-30 with Science categories.
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.
Star Formation Galaxies And The Interstellar Medium
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Author : Jose Franco
language : en
Publisher: Cambridge University Press
Release Date : 1993-06-10
Star Formation Galaxies And The Interstellar Medium written by Jose Franco and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-06-10 with Science categories.
The enormously powerful phenomena of starbursts are examined in this book. These spectacular star-forming events are seen on large scales in some galaxies, often triggered by galactic interactions. An intriguing implication of starburst research is that active galactic nuclei (AGN) may not be powered by accreting black holes. Instead theories are presented where compact powerhouses of dust-enshrouded star formation lie at the core of AGN, with supernovae exploding roughly once per year within massive nuclear concentrations of gas. This book collects articles from a timely international conference in Elba, Italy, in 1992; these comprise a thorough review of the most important developments in galactic-scale star formation since the starburst revolution of the late 1980s. This text will introduce graduate students to this exciting area and keep experts apace with rapid developments in it.
Triggered Star Formation In A Turbulent Interstellar Medium Iau S237
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Author : International Astronomical Union. Symposium
language : en
Publisher: Cambridge University Press
Release Date : 2007-05-28
Triggered Star Formation In A Turbulent Interstellar Medium Iau S237 written by International Astronomical Union. Symposium and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-28 with Science categories.
New stars form in the dense turbulent gas clouds of galaxies, and the formation of these clouds is the subject of the IAU S237. This book is the most up-to-date review of all aspects of cloud and star formation, and one of the few compendiums available on ISM turbulence.
New Horizons From Multi Wavelength Sky Surveys
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Author : Brian J. McLean
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
New Horizons From Multi Wavelength Sky Surveys written by Brian J. McLean and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Large area sky surveys are now a reality in the radio, IR, optical and X-ray passbands. In the next few years, new surveys using optical, UV and IR mosaic cameras with high throughput digital detectors will expand the dynamic range and accuracy of photometry and astrometry of objects over a significant fraction of the entire sky. Parallel X-ray and radio surveys over the same areas will produce astronomical image and spectroscopic databases of unprecedented size and quality. The combined data sets will provide significant new constraints on star formation, stellar dynamics, Galactic structure, the evolution of galaxies and large scale structure, as well as new opportunities to identify rare objects in the solar system and the Galaxy. Large area surveys have formidable data acquisition, processing, archiving, and data distribution demands and this meeting provided a forum for sharing experiences amongst workers specializing in different wavebands as well as discussing how multiband observations can reveal fundamental relationships in our understanding of the Universe.
Physics Of Star Formation In Galaxies
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Author : F. Palla
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-07-06
Physics Of Star Formation In Galaxies written by F. Palla and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-07-06 with Science categories.
The book begins with a historical introduction, "Star Formation: The Early History", that presents new material of interest for students and historians of science. This is followed by two long articles on "Pre-Main-Sequence Evolution of Stars and Young Clusters" and "Observations of Young Stellar Objects". These articles on the fascinating problem of star formation from interstellar matter give a thorough overview of present-day theories and observations. The articles contain material so far unpublished in the astronomical literature. The book addresses graduate students and can be used as a textbook for advanced courses in stellar astrophysics.
The Properties Of Star Forming Galaxies At Z 2
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Author : Dawn Erb
language : en
Publisher: Universal-Publishers
Release Date : 2005
The Properties Of Star Forming Galaxies At Z 2 written by Dawn Erb and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Science categories.
We study the properties of star-forming galaxies at redshift z 2, an era in which a substantial fraction of the stellar mass in the universe formed. Using 114 near-IR spectra of the H-alpha and [N II] emission lines and model spectral energy distributions fit to rest-frame UV through IR photometry, we examine the galaxies' star formation properties, dynamical masses and velocity dispersions, spatially resolved kinematics, outflow properties, and metallicities as a function of stellar mass and age. While the stellar masses of the galaxies in our sample vary by a factor of 500, dynamical masses from H-alpha velocity dispersions and indirect estimates of gas masses imply that the variation of stellar mass is due as much to the evolution of the stellar population and the conversion of gas into stars as to intrinsic differences in the total masses of the galaxies. About 10% of the galaxies are apparently young starbursts with high gas fractions, caught just as they have begun to convert large amounts of gas into stars. Using the [N II]/H-alpha ratio of composite spectra to estimate the average oxygen abundance, we find a monotonic increase in metallicity with stellar mass. From the estimated gas fractions, we conclude that the observed mass-metallicity relation is primarily driven by the increase in metallicity as gas is converted to stars. The picture that emerges is of galaxies with a broad range in stellar population properties, from young galaxies with ages of a few tens of Myr, stellar masses M 10 DEGREES9 Msun, and metallicities Z 1/3 Zsun, to massive objects with M* 10 DEGREES11 Msun, Z Zsun, and ages as old as the universe allows. All, however, are rapidly star-forming, power galactic-scale outflows, and have masses in gas and stars of at least 10 DEGREES10 Msun, in keeping with their likely role as the progenitors of elliptical galaxies
A Multi Wavelength Census Of Star Formation At Redshift Z 2
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Author : Naveen Reddy
language : en
Publisher: Universal-Publishers
Release Date : 2006
A Multi Wavelength Census Of Star Formation At Redshift Z 2 written by Naveen Reddy and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
We examine the census of star-forming galaxies and their extinction properties at redshift z 2, when a large fraction of the stellar mass in the universe formed. We find a good agreement between the X-ray, radio, and de-reddened UV estimates of the average star formation rate (SFR) for our sample of z 2 galaxies of 50 Msun/yr, indicating that the locally calibrated SFR relations appear to be statistically valid from redshifts 1.5