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Author : Daniel Anglés Alcázar
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (668 download)
Download or read book Study of the Earliest Stages of Galactic Star Formation written by Daniel Anglés Alcázar and published by . This book was released on 2009 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ke Wang
Publisher : Springer
ISBN 13 : 3662449692
Total Pages : 160 pages
Book Rating : 4.6/5 (624 download)
Download or read book The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds written by Ke Wang and published by Springer. This book was released on 2014-11-03 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an in-depth, high-resolution observational study on the very beginning of the formation process: the fragmentation of dense molecular clouds known as infrared dark clouds (IRDCs). Using the Submillimeter Array (SMA) and Very Large Array (VLA) radio interferometers, the author has discovered a common picture of hierarchical fragmentation that challenges some of the leading theoretical models and suggests a new, observation-driven understanding of how massive star formation in clustered environments may begin: it is initiated by the hierarchical fragmentation of a dense filament from 10 pc down to 0.01 pc, and the stellar mass buildup is simultaneously fed by hierarchical accretion at similar scales. The new scenario points out the importance of turbulence and filamentary structure, which are now receiving increasing attention and further tests from both observers and theorists.
Author : Fernando Rico Villas
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)
Download or read book Study of the Early Stages in the Formation of Super Star Clusters written by Fernando Rico Villas and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis aims to study the earliest heavily obscured phases of massive star formation in starburst (SB) galaxies through a multi-line analysis of the HC3N rotational transitions from the ground and vibrationally excited states (HC3N*). Due to its unique spectroscopic properties, we also discuss the potential of HC3N* as a tool to discern whether the obscured nuclei of galaxies are being heated by a SB or by an accreting super massive black hole (i.e. an active galactic nucleus; AGN). Star formation is one of the most relevant physical processes in the formation and evolution of a galaxy. In particular, the energy released back (feedback) to their surrounding interstellar medium (ISM) from massive stars profoundly impacts the galaxy’s evolution. In a SB galaxy, most star formation takes place in the nucleus and in the form of compact massive star clusters known as superstar clusters (SSCs), which represent one of the most extreme models of star formation. Another major source of energy that can profoundly impact the ISM of a galaxy is an AGN. Both massive star formation and the AGN can reduce the star formation efficiency of a galaxy and even halt future star formation through feedback mechanisms. Hence, to study the physical conditions of the gas driving the formation of SSCs and shed light on the formation of massive stars, which is still not well understood, we need to observe the earliest phases of massive star formation before significant feedback intervenes...
Author : Charles J. Lada
Publisher : Springer Science & Business Media
ISBN 13 : 9401136424
Total Pages : 779 pages
Book Rating : 4.4/5 (11 download)
Download or read book The Physics of Star Formation and Early Stellar Evolution written by Charles J. Lada and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 779 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of stars is one of the principle mysteries of nature. During the last two decades advances in technology have enabled more progress to be made in the quest to understand stellar origins than at any other time in history. The study of star formation has developed into one of the most important branches of mod ern astrophysical research. A large body of observational data and a considerable literat ure now exist concerning this topic and a 1arge community of international astronomers and physicists devote their efforts attempting to decipher the secrets of stellar birth. Yet, the young astronomerjphysicist or more advanced researcher desiring to obtain a basic background in this area of research must sift through a very diverse and sometimes bewildering literature. A literature which includes research in many discip1ines and sub discip1ines of classical astrophysics from stel lar structure to the interstellar medium and encompasses the entire range of the electromagnetic spectrum from radio to gamma rays. Often, the reward of a suc cessfu1 foray through the current literature is the realization that the results can be obsolete and outdated as soon as the ink is dry in the journal or the conference proceeding in which they are published.
Author : Jorge Luis Morales Ortiz
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (434 download)
Download or read book BLAST written by Jorge Luis Morales Ortiz and published by . This book was released on 2009 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Derek Ward-Thompson
Publisher : Cambridge University Press
ISBN 13 : 1139494473
Total Pages : 229 pages
Book Rating : 4.1/5 (394 download)
Download or read book An Introduction to Star Formation written by Derek Ward-Thompson and published by Cambridge University Press. This book was released on 2011-02-10 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Guiding the reader through all the stages that lead to the formation of a star such as our Sun, this advanced textbook provides students with a complete overview of star formation. It examines the underlying physical processes that govern the evolution from a molecular cloud core to a main-sequence star, and focuses on the formation of solar-mass stars. Each chapter combines theory and observation, helping readers to connect with and understand the theory behind star formation. Beginning with an explanation of the interstellar medium and molecular clouds as sites of star formation, subsequent chapters address the building of typical stars and the formation of high-mass stars, concluding with a discussion of the by-products and consequences of star formation. This is a unique, self-contained text with sufficient background information for self-study, and is ideal for students and professional researchers alike.
Author : Steven W. Stahler
Publisher : John Wiley & Sons
ISBN 13 : 3527618686
Total Pages : 865 pages
Book Rating : 4.5/5 (276 download)
Download or read book The Formation of Stars written by Steven W. Stahler and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 865 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive treatment of star formation, one of the most active fields of modern astronomy. The reader is guided through the subject in a logically compelling manner. Starting from a general description of stars and interstellar clouds, the authors delineate the earliest phases of stellar evolution. They discuss formation activity not only in the Milky Way, but also in other galaxies, both now and in the remote past. Theory and observation are thoroughly integrated, with the aid of numerous figures and images. In summary, this volume is an invaluable resource, both as a text for physics and astronomy graduate students, and as a reference for professional scientists.
Author : Norbert S. Schulz
Publisher : Springer Science & Business Media
ISBN 13 : 3540273212
Total Pages : 409 pages
Book Rating : 4.5/5 (42 download)
Download or read book From Dust To Stars written by Norbert S. Schulz and published by Springer Science & Business Media. This book was released on 2007-03-06 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of stellar formation in galaxies have a profound impact on our understanding of the present and the early universe. The book describes complex physical processes involved in the creation of stars and during their young lives. It illustrates how these processes reveal themselves from radio wavelengths to high energy X-rays and gamma -rays, with special reference towards high energy signatures. Several sections devoted to key analysis techniques demonstrate how modern research in this field is pursued.
Author : Santi Cassisi
Publisher : John Wiley & Sons
ISBN 13 : 3527665544
Total Pages : 506 pages
Book Rating : 4.5/5 (276 download)
Download or read book Old Stellar Populations written by Santi Cassisi and published by John Wiley & Sons. This book was released on 2013-08-29 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book discusses the theoretical path to decoding the information gathered from observations of old stellar systems. It focuses on old stellar systems because these are the fossil record of galaxy formation and provide invaluable information ont he evolution of cosmic structures and the universe as a whole. The aim is to present results obtained in the past few years for theoretical developments in low mass star research and in advances in our knowledge of the evolution of old stellar systems. A particularly representative case is the recent discovery of multiple stellar populations in galactic globular clusters that represents one of the hottest topics in stellar and galactic astrophysics and is discussed in detail. Santi Cassisi has authored about 270 scientific papers, 150 of them in peer-reviewed journals, and the title Evolution of Stars and Stellar Populations.
Author : Volker Bromm
Publisher : Springer
ISBN 13 : 9783642119644
Total Pages : 240 pages
Book Rating : 4.1/5 (196 download)
Download or read book The First Stars written by Volker Bromm and published by Springer. This book was released on 2016-09-07 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation of the first stars (Pop III stars) and galaxies is one of the great outstanding challenges in modern astrophysics and cosmology. The first stars are likely key drivers for early cosmic evolution and will be at the center of attention over the next decade. The best available space and ground-based telescopes like the Hubble Space Telescope probe the Universe to high redshifts and provide us with tantalizing hints; but they cannot yet directly detect the first generation of stars and the formation of the first galaxies. This is left as key science for future telecopes like the James Webb Space Telescope. This book is based in part on classroom tested lectures related to Pop III stars, but also draws from the author's review articles of the main physical principles involved. The book will thus combine pedagogical introductory chapters with more advanced ones to survey the cutting-edge advances from the frontier of research. It covers the theory of first star formation, the relation between first stars and dark matter, their impact on cosmology, their observational signatures, the transition to normal star formation as well as the assembly of the first galaxies. It will prepare students for interpreting observational findings and their cosmological implications.
Author : Carlos Carrasco González
Publisher :
ISBN 13 : 9788469353509
Total Pages : 119 pages
Book Rating : 4.3/5 (535 download)
Download or read book High Angular Resolution Study of the Earliest Stages of Star Formation written by Carlos Carrasco González and published by . This book was released on 2010 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Manuel Antonio Merello Ferrada
Publisher :
ISBN 13 :
Total Pages : 460 pages
Book Rating : 4.:/5 (893 download)
Download or read book Study of Galactic Clumps with Millimeter written by Manuel Antonio Merello Ferrada and published by . This book was released on 2014 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Massive stars play a key role in the evolution of the Galaxy; hence they are important objects of study in astrophysics. Although they are rare compared to low mass stars, they are the principal source of heavy elements and UV radiation, affecting the process of formation of stars and planets, and the physical, chemical, and morphological structure of galaxies. Star clusters form in dense "clumps" (~few parsecs in size) within giant molecular clouds, while individual stars form in cores (subparsec scale). An important step in the observational study of massive star formation is the identification and characterization of clumps. More detailed studies can then show how these clumps fragment into cores. Studies of clumps in our Galaxy will provide fundamental guidelines for the analysis of other galaxies, where individual clumps and cores cannot be resolved, and provide a catalog of interesting sources for observations of the Milky Way with a new generation of instruments, such as the Atacama Large Millimeter/Submillimeter Array. Large-scale blind surveys of the Galactic plane at millimeter and submillimeter wavelengths have recently been completed, allowing us to identify star forming clumps and improve our understanding of the early stages of massive stars. One of these studies, the Bolocam Galactic Plane Survey (BGPS), mapped the continuum emission at 1.1 mm over a large region of the northern Galactic plane at a resolution of 33'', identifying 8559 compact sources throughout the Galaxy. In this dissertation, I present observations of a sample of sources from the BGPS catalog, obtained with the Submillimeter High Angular Resolution Camera II (SHARC-II). I present in this work 107 continuum emission maps at 350 microns at high angular resolution (8.5'') toward clump-like sources and construct a catalog of BGPS substructures. I estimate clump properties such as temperatures and multiplicity of substructures, and compare my results with 350 microns continuum maps from the Hi-GAL survey. I also present a detailed analysis, using molecular line and dust continuum observations, of the region G331.5-0.1, one of the most luminous regions of massive star formation in the Milky Way, located at the tangent region of the Norma spiral arm. Molecular line and millimeter continuum emission maps reveal the presence of six compact and luminous molecular clumps, with physical properties consistent with values found toward other massive star forming sources. This work includes the discovery of one of the most energetic and luminous molecular outflows known in the Galaxy, G331.512-0.103. For this high-speed outflow, I present ALMA observations that reveal a very compact, extremely young bipolar outflow and a more symmetric outflowing shocked shell surrounding a very small region of ionized gas. The source is one of the youngest examples of massive molecular outflows associated with the formation of a high-mass star.
Author : Carlos M. Poventud Estrada
Publisher :
ISBN 13 :
Total Pages : 250 pages
Book Rating : 4.:/5 (434 download)
Download or read book Study of the Earliest Stages of High-mass Star Formation Through High-angular Resolution Spectral Line Observations written by Carlos M. Poventud Estrada and published by . This book was released on 2009 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Francoise Combes
Publisher : John Wiley & Sons
ISBN 13 : 1119817994
Total Pages : 288 pages
Book Rating : 4.1/5 (198 download)
Download or read book Galaxies written by Francoise Combes and published by John Wiley & Sons. This book was released on 2021-03-05 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxies are vast ensembles of stars, gas and dust, embedded in dark matter halos. They are the basic building blocks of the Universe, gathered in groups, clusters and super-clusters. They exist in many forms, either as spheroids or disks. Classifications, such as the Hubble sequence (based on mass concentration and gas fraction) and the colormagnitude diagram (which separates a blue cloud from a red sequence) help to understand their formation and evolution. Galaxies spend a large part of their lives in the blue cloud, forming stars as spiral or dwarf galaxies. Then, via a mechanism that is still unclear, they stop forming stars and quietly end in the red sequence, as spheroids. This transformation may be due to galaxy interactions, or because of the feedback of active nuclei, through the energy released by their central super-massive black holes. These mechanisms could explain the history of cosmic star formation, the rate of which was far greater in the first half of the UniverseÂs life. Galaxies delves into all of these surrounding subjects in six chapters written by dedicated, specialist astronomers and researchers in the field, from their numerical simulations to their evolutions.
Author :
Publisher :
ISBN 13 :
Total Pages : 810 pages
Book Rating : 4.:/5 (31 download)
Download or read book Star Formation in Galaxies written by and published by . This book was released on 1987 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Francois Hammer
Publisher : World Scientific Publishing Company
ISBN 13 : 1786340569
Total Pages : 399 pages
Book Rating : 4.7/5 (863 download)
Download or read book Studying Distant Galaxies: A Handbook Of Methods And Analyses written by Francois Hammer and published by World Scientific Publishing Company. This book was released on 2016-11-15 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Distant galaxies encapsulate the various stages of galaxy evolution and formation from over 95% of the development of the universe. As early as twenty-five years ago, little was known about them, however since the first systematic survey was completed in the 1990s, increasing amounts of resources have been devoted to their discovery and research. This book summarises for the first time the numerous techniques used for observing, analysing, and understanding the evolution and formation of these distant galaxies.In this rapidly expanding research field, this text is an every-day companion handbook for graduate students and active researchers. It provides guidelines in sample selection, imaging, integrated spectroscopy and 3D spectroscopy, which help to avoid the numerous pitfalls of observational and analysis techniques in use in extragalactic astronomy. It also paves the way for establishing relations between fundamental properties of distant galaxies. At each step, the reader is assisted with numerous practical examples and ready-to-use methodology to help understand and analyse research.François Hammer worked initially in general relativity and made the first modelling of gravitational lenses prior to their spectroscopic confirmation. Following this, he became co-leader of the first complete survey of distant galaxies, the Canada-France-Redshift Survey. This led to the discovery of the strong decrease of the cosmic star formation density measured from UV light as z=1, which, alongside Hector Flores, they confirmed as bolometric and dust independent. With Mathieu Puech, they then pioneered the 3D spectroscopy of distant galaxies, leading to a major increase of understanding of the dynamic state of distant galaxies evidenced by the scatter of the Tully-Fisher relation. This led them to propose, with the addition to the team of Myriam Rodrigues, that galactic disks may survive or be rebuilt in gas-rich mergers, a scenario that is consistent with contemporary cosmological simulations. Besides extensive observational experience, the authors have led, or are leading, several instruments implemented or to be implemented at the largest telescopes, including VLT/Giraffe, VLT/X-shooter, VLT/MOONS and E-ELT/MOSAIC. They have also developed several observational techniques in adaptive optics, and in sky subtraction for integral field units and fibre instruments.
Author : Cody James Lamarche
Publisher :
ISBN 13 :
Total Pages : 157 pages
Book Rating : 4.:/5 (114 download)
Download or read book A Detailed Study of Star Formation at Its Cosmic Peak written by Cody James Lamarche and published by . This book was released on 2019 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: The star-formation-rate density of the universe has decreased by a factor of ~ 10 over the last 10 billion years, indicating a major change in either the efficiency with with galaxies form their stars or the availability of star-forming gas over the same time. In this thesis, we study the stellar populations within galaxies during the epoch of peak cosmic star-formation, ~ 10 billion years ago, using infrared observations of the ionized, neutral, and molecular phases of the interstellar medium (ISM) therein. In particular, we focus on two galaxies within this era, both of which have vigorous star-formation as well as active galactic nuclei (AGN), in an effort to learn more about the modes of star-formation at early times as well as the influence of AGN feedback on star-formation. As a first example, we examine the stellar population within 3C 368, a Fanaroff-Riley Class II (FR-II) galaxy at redshift 1.131. Our observations suggest a powerful AGN, accompanied by vigorous and extended star formation. We estimate the age of the starburst and find that it is nearly concurrent with the latest episode of AGN flaring, suggesting a link between the growth of the supermassive black hole and stellar population in this source. Our ionized-gas observations suggest a low gas-phase metallicity within this source, consistent with the weak molecular gas lines that we observe. We suggest that perhaps 3C 368 is accreting pristine molecular gas from an external source, thereby diluting its gas-phase metallicity. For our second example, we investigate the star-formation within SDP.11, a gravitationally-lensed galaxy at redshift 1.783. Our high-resolution gas and dust-continuum observations show intense star-formation in this source extended over several kiloparsecs. Gravitational-lens modeling further indicates that the star formation in this source is extended over a 3-5 kpc rotating disk, suggesting that the starburst present here may not be the result of a major merger, as is the case for local ultraluminous infrared galaxies (ULIRGs), but some other mechanism. The findings presented in this thesis support the idea of a different mode of star-formation being present in high-redshift galaxies. In contrast to local ULIRGs, which have intense star-formation confined to their centers, we find kiloparsec-scale star-forming disks present in galaxies during the epoch of peak cosmic star-formation. While local star-forming galaxies tend to be the product of major-mergers, high-redshift starburst galaxies may well be the product of another process, perhaps accretion of material from the cosmic web.
