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Drivers Of Turbulence In The Neutral Interstellar Medium Of Dwarf Galaxies
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Book Synopsis Drivers of Turbulence in the Neutral Interstellar Medium of Dwarf Galaxies by : Adrienne M. Stilp
Download or read book Drivers of Turbulence in the Neutral Interstellar Medium of Dwarf Galaxies written by Adrienne M. Stilp and published by . This book was released on 2013 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cause of HI velocity dispersions in the interstellar medium (ISM) of galaxies is often attributed to star formation, but recent evidence has shown these two quantities are not connected in regions of low star formation. This lack of connection is most apparent in dwarf galaxies and the outer disks of spiral galaxies. However, unique data sets have recently been collected that can help address this discrepancy. The ACS Nearby Survey Treasury Project (ANGST) has measured time-resolved star formation histories (SFHs) in ~70 nearby galaxies. The followup Very Large Array-ANGST survey (VLA-ANGST) provides complementary HI observations of a subset of ANGST galaxies. In this thesis, I explore the connection between star formation and HI kinematics in a number of nearby dwarf galaxies. I first present the Very Large Array-ACS Nearby Galaxy Survey Treasury Project (ANGST). VLA-ANGST was designed to provide high spatial and velocity resolution observations of the HI component of the interstellar medium (ISM) in ANGST galaxies. I describe the data calibration and imaging procedures, and then present the publicly-available data products. The observations from this survey and from The HI Nearby Galaxy Survey (THINGS) comprise the majority of data in my thesis. Using VLA-ANGST and THINGS data, I present a method to measure the average HI kinematics in a number of nearby dwarf galaxies by co-adding individual line-of-sight profiles. These "superprofiles" are composed of a central narrow peak (6-10 km/s) with higher velocity wings to either side. When scaled to the same half-width half-maximum, the shapes of the superprofiles are very similar. I interpret the central peak as representative of the average turbulent motion; the wings are then due to HI moving faster than expected compared to the average kinematics. I then compare the superprofile parameters to physical properties such as mass surface density and star formation intensity. The average velocity dispersion correlate most strongly with HI surface density, and do not show correlations with star formation intensity unless higher mass galaxies were included. The properties of the wings are more connected with star formation. By applying energy arguments, I determine that star formation can provide enough energy to drive the HI kinematics over 10 Myr timescales, while a gravitational instability cannot. I then extend this analysis to spatially-resolved scales in these galaxies, and generated superprofiles in regions determined by radius or by star formation intensity. These superprofiles provide a more direct comparison between HI kinematics and local ISM properties compared to the analysis on global scales. The spatially-resolved superprofiles indicate that star formation does not uniquely determine the HI velocity dispersion, but it does appear to provide a lower floor below which velocity dispersions cannot fall. I also find that the coupling efficiency between star formation and HI kinematics decreases with increasing star formation surface density, which may indicate that star formation energy couples more consistently to other phases of the ISM. I finally explore the timescale over which HI responds to star formation using a combination of VLA-ANGST, THINGS, and ANGST data. Using time-resolved SFHs from ANGST, I measure the average star formation rate as a function of time and compared it to present-day HI kinematics. I find that the HI kinematics are most strongly correlated with star formation that occurred 30-40 Myr ago, which supports the idea that supernova explosions are one driver of HI kinematics even in low star formation systems.
Book Synopsis Neutral Interstellar Medium Phases and Star Formation Tracers in Dwarf Galaxies by : Phillip Johnathan Cigan
Download or read book Neutral Interstellar Medium Phases and Star Formation Tracers in Dwarf Galaxies written by Phillip Johnathan Cigan and published by . This book was released on 2015 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interstellar Turbulence by : José Franco
Download or read book Interstellar Turbulence written by José Franco and published by Cambridge University Press. This book was released on 1999-05-28 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely volume presents a series of review articles covering every aspect of interstellar turbulence--from accretion disks, molecular clouds, atomic and ionized media, through to spiral galaxies - based on a major international conference held in Mexico City.With advances in observational techniques and the development of more efficient computer codes and faster computers, research in this area has made spectacular progress in recent years. This book provides a comprehensive overview of the most important developments in observing and modelling turbulent flows in the cosmos. It provides graduate student and researchers with a state-of-the-art summary of observational, theoretical and computational research in interstellar turbulence.
Book Synopsis The Violent Interstellar Medium of Dwarf Irregular Galaxies by : Fabian Walter
Download or read book The Violent Interstellar Medium of Dwarf Irregular Galaxies written by Fabian Walter and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Interstellar Medium in External Galaxies by : David J. Hollenbach
Download or read book The Interstellar Medium in External Galaxies written by David J. Hollenbach and published by . This book was released on 1990 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Frontiers for Diagnosing the Turbulent Nature of the Multiphase Magnetized Interstellar Medium by :
Download or read book New Frontiers for Diagnosing the Turbulent Nature of the Multiphase Magnetized Interstellar Medium written by and published by . This book was released on 2014 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetohydrodynamic (MHD) turbulence is a critical component of the current paradigms of star formation, dynamo theory, particle transport, magnetic reconnection and evolution of the interstellar medium (ISM). In order to gain understanding of how MHD turbulence regulates processes in the ISM of galaxies a confluence of numerics, observations, and theory should be used. In this thesis I detail progress that I have made on the connections between theoretical, numerical, and observational understanding of MHD turbulence as it applies to the neutral, ionized, and molecular interstellar medium. In particular, I discuss the development of several new techniques for studies of turbulence to be applied to observations in order to obtain information about the turbulence cascade and the compressibility and magnetization of the fluid. These techniques are first tested on numerical simulations by means of synthetic observations. For most of the numerical tests in this thesis I make use of three-dimensional 512x512x512 compressible MHD isothermal simulations performed for different sonic and Alfvenic Mach numbers. The post processing of these simulations for tests of the turbulence diagnostics include the transformation to column density maps and position-position-velocity (PVV) cubes and can include radiative transfer, telescope beam smoothing, cloud boundaries, and noise. Throughout this thesis I explore the use of new techniques such as the bispectrum, genus statistic, probability distribution function (PDF), hierarchical structure trees (dendrograms), and extend the knowledge of the 2D power spectrum as applied to observations. I discus the application of these techniques to 21-cm data (tracing the warm and cold neutral medium), linear polarization gradients (tracing the warm ionized medium) and emission from carbon monoxide and its isotopes (tracing the molecular medium). This thesis represents a bridge between numerics and observations towards the effort to understand Galactic and extragalactic turbulence and it is just the beginning (i.e. further studies are being conducted that could not be included here). The use of multiple techniques can provide a more accurate indication of the turbulence parameters of interest. The results presented here are based on works I have previously published as first author papers.
Book Synopsis Properties and Kinematics of the Interstellar Medium in a Small Sample of Nearby Dwarf Galaxies by : Lisa Marie Young
Download or read book Properties and Kinematics of the Interstellar Medium in a Small Sample of Nearby Dwarf Galaxies written by Lisa Marie Young and published by . This book was released on 1997 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Bärbel Silvia Koribalski Publisher :Springer Science & Business Media ISBN 13 :1402069332 Total Pages :375 pages Book Rating :4.4/5 (2 download)
Book Synopsis Galaxies in the Local Volume by : Bärbel Silvia Koribalski
Download or read book Galaxies in the Local Volume written by Bärbel Silvia Koribalski and published by Springer Science & Business Media. This book was released on 2009-04-29 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely book presents an overview of the galaxies within the Local Volume, including the Local Group and our closest neighbours, the Andromeda Galaxy and the Magellanic Clouds. Presented here are the latest results from radio, infrared and optical surveys as well as detailed multi-wavelength studies of individual galaxies. The book aims to provide a vibrant forum for presentations and discussions across a broad range of astrophysical topics.
Book Synopsis Cosmic Magnetism, by : Percy Seymour
Download or read book Cosmic Magnetism, written by Percy Seymour and published by CRC Press. This book was released on 1986 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of extraterrestrial magnetic fields is a relatively new one, confirmation of the existance of the first such field (that of our Sun) having come a s late as 1908. In the past 30 years a great ammount of knowledge has been accumulated on Cosmic Magnetism, which has turned out to be a truly fascinating topic for study. Percy Seymour's book is the first to deal with the topic in a non-mathematical way, and he offers a fine introduction to his subject. The first three chapters consolidate our knowledge on magnetism in general and the magnetic field of the Earth, as well as discussing the reasons for studying astronomy and cosmic magnetism in particular. The remainder of the book is devoted to the main areas of cosmic magnetism - solar, plantetary and interplanetary fields, fields in stars and pulsars, fields of the milky way and fields in other galaxies. Cosmic Magnetism in an ideal book for sixth-formers and undergraduates studying physics or astronomy and will also appeal to amateur astronomers. as previous work on this topic has been 'hidden' in specialised academic journals.
Book Synopsis The Distribution of the Interstellar Medium in the Scd Galaxy NGC 6946 and in a Sample of Dwarf Irregular Galaxies by : Linda Tacconi
Download or read book The Distribution of the Interstellar Medium in the Scd Galaxy NGC 6946 and in a Sample of Dwarf Irregular Galaxies written by Linda Tacconi and published by . This book was released on 1988 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chemodynamical Properties of Simulated Late-type Galaxies by : Kate Pilkington
Download or read book Chemodynamical Properties of Simulated Late-type Galaxies written by Kate Pilkington and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Physics of the Interstellar Medium, Second Edition by : J.E Dyson
Download or read book The Physics of the Interstellar Medium, Second Edition written by J.E Dyson and published by CRC Press. This book was released on 1997-01-01 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book leads the advanced undergraduate through the wide range of disciplines related to an understanding of the interstellar medium and is suitable for any student studying either physics or astrophysics. The study of the interstellar medium incorporates a large range of physical More...processes on both large and small scales all of which are covered in this text. Together with the inclusion of simple models and problems at the end of each chapter this text provides a comprehensive overview and grounding in the study of the interstellar medium.
Book Synopsis Outskirts of Galaxies by : Johan H. Knapen
Download or read book Outskirts of Galaxies written by Johan H. Knapen and published by Springer. This book was released on 2017-07-09 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of invited reviews written by world-renowned experts on the subject of the outskirts of galaxies, an upcoming field which has been understudied so far. These regions are faint and hard to observe, yet hide a tremendous amount of information on the origin and early evolution of galaxies. They thus allow astronomers to address some of the most topical problems, such as gaseous and satellite accretion, radial migration, and merging. The book is published in conjunction with the celebration of the end of the four-year DAGAL project, an EU-funded initial training network, and with a major international conference on the topic held in March 2016 in Toledo. It thus reflects not only the views of the experts, but also the scientific discussions and progress achieved during the project and the meeting. The reviews in the book describe the most modern observations of the outer regions of our own Galaxy, and of galaxies in the local and high-redshift Universe. They tackle disks, haloes, streams, and accretion as observed through deep imaging and spectroscopy, and guide the reader through the various formation and evolution scenarios for galaxies. The reviews focus on the major open questions in the field, and explore how they can be tackled in the future. This book provides a unique entry point into the field for graduate students and non-specialists, and serves as a reference work for researchers in this exciting new field.
Book Synopsis NGC 1569 - the ISM of a Dwarf Galaxy in the Aftermath of a Starburst by : Stefanie Mühle
Download or read book NGC 1569 - the ISM of a Dwarf Galaxy in the Aftermath of a Starburst written by Stefanie Mühle and published by Cuvillier Verlag. This book was released on 2003 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unveiling Galaxies by : Jean-René Roy
Download or read book Unveiling Galaxies written by Jean-René Roy and published by Cambridge University Press. This book was released on 2018 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thought provoking study of the powerful impact of images in guiding astronomers' understanding of galaxies through time.
Book Synopsis Turbulence and Structure Formation in the Interstellar Medium by : Sami Dib
Download or read book Turbulence and Structure Formation in the Interstellar Medium written by Sami Dib and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence in the Interstellar Medium by : Christopher M. Brunt
Download or read book Turbulence in the Interstellar Medium written by Christopher M. Brunt and published by . This book was released on 1999 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
