Exploring The Limits Of Star Formation From The Extreme Environment Of Galaxy Interactions To The Milky Way
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Exploring The Limits Of Star Formation From The Extreme Environment Of Galaxy Interactions To The Milky Way
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Author : Amanda Lea Heiderman
language : en
Publisher:
Release Date : 2012
Exploring The Limits Of Star Formation From The Extreme Environment Of Galaxy Interactions To The Milky Way written by Amanda Lea Heiderman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
In this thesis, I explore the rate at which molecular gas is converted to stars through detailed studies of a sample of molecular clouds in the Milky Way, IFU spatially resolved observations of gas-rich nearby interacting galaxies, as well as the environmental dependence of star formation and galaxy morphology in a galaxy supercluster. This thesis is composed of three individual projects that investigate nearby star formation within the local 500 pc of our Sun, to neighboring extreme star forming environments of interacting starburst galaxies, and finally studying how star formation varies with galaxy morphology in a galaxy supercluster a z~0.165. I discuss the relation between the star formation rate (SFR) and molecular gas surface densities (e.g., Schmidt-Kennicutt relation) in Galactic star forming regions and find there is a discrepancy between my study and extragalactic relations. The discrepancy is attributed to extragalactic measurements that are averaged over large>kpc scales and include star forming molecular gas (above some threshold) and molecular gas the is not dense enough to form stars. I find a steep increase in the Galactic SFR-gas surface density relation indicative of a threshold for efficient star formation that is best fit to a broken power law with a linear slope above 129 Msun pc−2. I introduce the VIRUS-P Investigation of the eXtreme ENviroments of Starbursts (VIXENS) project which is a survey of interacting is a large integral field unit survey of nearby infrared bright (L_IR>3x1010 Lsun) interacting/starburst galaxies. The main goal of VIXENS is to investigate the relation between star formation and gas content on spatially resolved scales of ~0.1-1 kpc in the extreme star forming environments of interacting/starburst galaxies. The VIXENS sample is composed of systems in a range interaction stages with morphological signatures from early phase (close pairs) to late stage mergers (single system with multiple nuclei), SFRs, and gas surface densities. I highlight the first results from the VIXENS survey in the late interaction phase galaxy merger Arp 299. I find 1.3 kpc regions in Arp 299 to lie along the SFR-gas surface density relation found for mergers at high redshift, but this relation is highly dependent on the CO to molecular hydrogen (H2) conversion factor. I find evidence for a Galactic CO-to-H2 conversion factor using metallicity and dust temperature measurements, which would place 1.3 kpc regions in the Arp 299 merger in between the high redshift and Kennicutt-Schmidt relations. Comparing the SFR to dense gas surface densities as traced by HCN and HCO, I find an agreement between the spatially resolved measurements and that found on global scales in spirals and (ultra)luminous infrared galaxies. Finally, I present an investigation of the influence of environment on frequency, distribution, color, and star formation properties of galaxy mergers and non-interacting galaxies in the Abell 901/902 supercluster at z~0.165. I find galaxy mergers be preferentially blue in color and have an enhanced SFR by a factor of ~2 compared to non-interacting galaxies. This result may be due to a decrease in galaxy velocity dispersion in the cluster outskirt, favoring galaxy-galaxy interactions, or to interacting galaxies that are part of groups or field galaxies being accreted along cosmological filaments by the clusters. I compare to N-body simulations of groups and field galaxies accreting onto the clusters and find the fraction of mergers are similar to that predicated at group overdensities. I find the SFR of galaxies in the supercluster to be depressed compared to field galaxies in both the core and cluster outskirts, suggesting that an environmental process such as ram pressure stripping is effective throughout the cluster. The results of a modest SFR enhancement and a low merger fraction culminate in my finding that mergers contribute only a small fraction (between 10% and 15%) of the total SFR density of the Abell 901/902 clusters.
Star Formation And The Ism
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Author : Aede Folkert Loenen
language : en
Publisher:
Release Date : 2009
Star Formation And The Ism written by Aede Folkert Loenen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Interstellar matter categories.
Star Formation Across Galactic Environments
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Author : Jason Young
language : en
Publisher:
Release Date : 2012
Star Formation Across Galactic Environments written by Jason Young and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Star Formation In Galaxies
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Author :
language : en
Publisher:
Release Date : 1987
Star Formation In Galaxies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Astrophysics categories.
The Formation Of Stars
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Author : Steven W. Stahler
language : en
Publisher: John Wiley & Sons
Release Date : 2008-07-11
The Formation Of Stars written by Steven W. Stahler and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-07-11 with Science categories.
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.
An Introduction To Star Formation
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Author : Derek Ward-Thompson
language : en
Publisher: Cambridge University Press
Release Date : 2011-02-10
An Introduction To Star Formation written by Derek Ward-Thompson 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 2011-02-10 with Science categories.
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.
Star Formation In Galaxy Evolution Connecting Numerical Models To Reality
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Author : Nickolay Y. Gnedin
language : en
Publisher: Springer
Release Date : 2015-09-09
Star Formation In Galaxy Evolution Connecting Numerical Models To Reality written by Nickolay Y. Gnedin and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-09 with Science categories.
This book contains the elaborated and updated versions of the 24 lectures given at the 43rd Saas-Fee Advanced Course. Written by four eminent scientists in the field, the book reviews the physical processes related to star formation, starting from cosmological down to galactic scales. It presents a detailed description of the interstellar medium and its link with the star formation. And it describes the main numerical computational techniques designed to solve the equations governing self-gravitating fluids used for modelling of galactic and extra-galactic systems. This book provides a unique framework which is needed to develop and improve the simulation techniques designed for understanding the formation and evolution of galaxies. Presented in an accessible manner it contains the present day state of knowledge of the field. It serves as an entry point and key reference to students and researchers in astronomy, cosmology, and physics.
Principles Of Star Formation
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Author : Peter Bodenheimer
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-07-10
Principles Of Star Formation written by Peter Bodenheimer 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 2011-07-10 with Science categories.
Understanding star formation is one of the key fields in present-day astrophysics. This book treats a wide variety of the physical processes involved, as well as the main observational discoveries, with key points being discussed in detail. The current star formation in our galaxy is emphasized, because the most detailed observations are available for this case. The book presents a comparison of the various scenarios for star formation, discusses the basic physics underlying each one, and follows in detail the history of a star from its initial state in the interstellar gas to its becoming a condensed object in equilibrium. Both theoretical and observational evidence to support the validity of the general evolutionary path are presented, and methods for comparing the two are emphasized. The author is a recognized expert in calculations of the evolution of protostars, the structure and evolution of disks, and stellar evolution in general. This book will be of value to graduate students in astronomy and astrophysics as well as to active researchers in the field.
Deep Millimeter Surveys Implications For Galaxy Formation And Evolution
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Author : David H Hughes
language : en
Publisher: World Scientific
Release Date : 2001-10-29
Deep Millimeter Surveys Implications For Galaxy Formation And Evolution written by David H Hughes and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-10-29 with Science categories.
The arrival of large submillimeter and millimeter-wave detector arrays opened a new window on galaxy formation and evolution. The major new facilities now being designed or constructed, such as ALMA (MMA) and the Large Millimeter Telescope (LMT), will soon be expanding the horizons even farther.The Conference on “Deep Millimeter Surveys: Implications for Galaxy Formation and Evolution” drew together the major international groups working on submillimeter and millimeter-wave galaxies to discuss their relation to other galaxies both near by and in the early Universe, the role of the LMT and other new facilities in advancing the new field, and the implications of the new results and models for our understanding of galaxy formation and evolution. The resulting compendium of reports on observations, simulations, theory and interpretation, and instrumentation is the first book to present the new millimeter view of the early Universe thoroughly in a single volume.
The Benefit Of The Doubt
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Author : Jaakko Kurhi
language : en
Publisher: Xlibris Corporation
Release Date : 2021-01-26
The Benefit Of The Doubt written by Jaakko Kurhi and has been published by Xlibris Corporation this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-01-26 with Science categories.
The spiral shaped Milky Way galaxy First peaked my attention. It's an interesting object because its shape offers challenging actions to come truth as its shape evolved. Thus in this book, how a spiral galaxy evolved is perfectly achievable operation in the mechanical sense, without help from magical words; “the event just happened”. Also, read about concept of how to make a complex atomic structure into a simple atom which the mechanics of nature can be built at the time atoms don’t get crushed under extreme pressure and heat. In this book I also reveal the truth nature of light, photon and red shift phenomenon.