The History Of The Milky Way And Its Satellite System
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The History Of The Milky Way And Its Satellite System
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Author : Andreas Burkert
language : en
Publisher:
Release Date : 1996
The History Of The Milky Way And Its Satellite System written by Andreas Burkert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Science categories.
To The Milky Way And Beyond Exploration Outside The Solar System
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Author : Charlie Light
language : en
Publisher: Gareth Stevens Publishing LLLP
Release Date : 2020-07-15
To The Milky Way And Beyond Exploration Outside The Solar System written by Charlie Light and has been published by Gareth Stevens Publishing LLLP this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-15 with Juvenile Nonfiction categories.
The first artificial satellite launched on October 5, 1957, forever changing humanity's relationship with the mysterious galaxy we call home. Since then, we have ventured farther into the Milky Way, making incredible scientific discoveries. This fascinating, interdisciplinary volume takes readers through the history of space exploration and into the final frontier of human travel. They'll learn key scientific concepts about the universe, such as the different types of galaxies and how we measure space travel. Vivid photographs and graphic organizers provide captivating visuals. Fun fact boxes and informative sidebars provide smaller, understandable chunks of amazing data.
Search For Ultra Faint Milky Way Satellites
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Author : Dongwon Kim
language : en
Publisher:
Release Date : 2017
Search For Ultra Faint Milky Way Satellites written by Dongwon Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The current standard cosmological model is a remarkable achievement in providing an excellent description of the formation of largest-scale structures in the observable universe. However, there have been persistent tensions between observations and the theoretical model on galactic and sub-galactic scales. One of the most pressing issues was the "plane of satellite" problem: the distribution of observed Milky Way satellite galaxies appears to form a thin polar plane, which is largely inconsistent with the prediction of the standard cosmological model, i.e. an isotropic distribution of dark matter sub-halos. This problem was often seen as a consequence of observational biases because many of previously known satellite galaxies were discovered by the Sloan Digital Sky Survey whose survey footprint mainly focused on the northern Galactic pole region. Subsequent surveys to map the southern sky were thus required for an unbiased observational assessment of the standard cosmological model. This thesis presents the discovery of five new low-luminosity Milky Way companions i.e. dwarf spheroidal galaxies and star clusters from the Sloan Digital Sky Survey, Dark Energy Survey, and the Stromlo Milky Way Satellite survey project: PegasusIII, Horologium II, and Kim 1-3. Pegasus III is an ultra-faint outer halo dwarf satellite in the constellation of Pegasus. The large mass-to-light ratio inferred from photometric and spectroscopic analysis indicates a substantial amount of dark matter component in Pegasus III. Horologium II is one of the ultra-faint dwarf satellites in the vicinity of the Magellanic Clouds discovered in the Dark Energy Survey Year 1 data. Its proximity to a satellite dwarf Horologium I implies their possible companionship. Kim 1 is an extremely low-mass star cluster in the constellation of Pegasus with an unusually high ellipticity and low central surface brightness, which implies that it is being tidally disrupted. Kim 2 is a low-mass outer halo star cluster in the constellation of Indus. Although this stellar system falls in between the realms of star clusters and dwarf galaxies on the size-luminosity plane, evidence of pronounced mass segregation in the object argues in favour of star cluster-like nature. Kim 3 is another extremely low-luminosity star cluster in the constellation of Centaurus. With the lack of well-defined centre and evidence of mass segregation, Kim 3 is also classified as a star cluster in the final stage of tidal disruption. Both Pegasus III and Horologium II, as well as the majority of new dwarf satellites discovered by other recent studies, turn out tightly aligned with the original plane of satellites defined by previously known objects. This result confirms the presence of the plane of satellites throughout the whole sky, formerly speculated based on the distribution of clas- sical satellite galaxies decades ago. These findings largely conflict with the prediction of the current standard cosmological model and thus request its reexamination or an alternative model to account for the observation. The discovery of Kim 1-3 implies the possible existence of a large population of such extremely low-mass star clusters. These objects are possibly stripped down versions of formerly more massive star clusters or born extremely low-mass clusters that have survived to the present time. Dedicated observational and theoretical follow-up studies are required to determine their origin, which will shed a light on the formation and evolution history of star clusters in general.
Galaxy
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Author : Stuart Clark
language : en
Publisher: Quercus Books
Release Date : 2008-01-01
Galaxy written by Stuart Clark and has been published by Quercus Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-01-01 with Galaxies categories.
With Stuart Clark's lucid text and nearly 500 cutting-edge images, GALAXY investigates every aspect of the Milky Way - from its place in the Universe to its large-scale anatomy, from its history to its future. We approach the Milky Way from the very edge of the Universe, threading our way through massive conglomerations of galaxies gathered like grains of dust on a veil of cobwebs. Out here we can survey the thriving diversity of galaxy types and galactic life. Homing in on our destination, we skirt fleets of satellite galaxies, orbiting our Galaxy like the Moon orbits the Earth, before plunging through the Milky Way's spiral arms on a course that will ultimately lead us to its dark heart - a gravitational maelstrom of white dwarfs, neutron stars and hypergiants, all in the thrall of a supermassive black hole.As we tour the Galaxy the rhythms of stellar life unfold before our eyes: we pass through dark clouds of dust and gas incubating clusters of embryonic stars, we discover spectacular emission nebulae blazing in the fierce radiation of stellar newborns, we watch dying stars bloom and fade as planetary nebulae, or tear themselves apart as supernovae and we survey the planets and moons of our Solar System.
The Formation Of The Milky Way
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Author : E. J. Alfaro
language : en
Publisher: Cambridge University Press
Release Date : 1995-08-03
The Formation Of The Milky Way written by E. J. Alfaro 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 1995-08-03 with Science categories.
This review examines all the key physical processes involved in the formation and evolution of the Milky Way, based on an international meeting held in Granada (Spain).
Structure Of The M31 Satellite System
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Author : Anthony Rhys Conn
language : en
Publisher:
Release Date : 2013
Structure Of The M31 Satellite System written by Anthony Rhys Conn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Andromeda Galaxy categories.
The Magellanic System
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Author : Stephen Pardy
language : en
Publisher:
Release Date : 2018
The Magellanic System written by Stephen Pardy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
How do low-mass galaxies grow into massive spirals like our Milky Way? How does cold gas reach the inner disks of galaxies to feed ongoing star formation? These are some of the fundamental outstanding questions in galaxy formation and evolution. The Magellanic System holds the key to answering these questions. This system consists of the Large and Small Magellanic Clouds (LMC and SMC), which are the closest example of interacting dwarf galaxies to us, and the Magellanic Stream; an extensive complex of cold and ionized gas that surrounds them. While the Magellanic System contains unambiguous evidence of gas accretion and galaxy interactions, its origin is still unexplained by current models. The LMC is uncommon among late-type galaxies because its stellar bar appears offset from its stellar disk. In addition, the Magellanic Stream is highly ionized, unexpectedly massive, and composed of material from both the LMC and SMC. Finally, there are claims of dwarf satellite galaxies aligned with the Magellanic Stream and the Clouds that support the notion that these dwarf galaxies might have arrived in the Milky Way with the LMC and SMC. In my thesis, I tackle these mysteries of the Magellanic System. My results clarify the origin and properties of the offset between the stellar bar and disk by showing that it is a long-lived feature that arises from the gravitational interaction between the LMC and the SMC. This result matches observational evidence of the tidal interaction between the LMC and SMC, and has implications for our measurements of other galaxies across the universe. My results also elucidate how this tidal interaction between the Clouds can strip gas from both the LMC and SMC into a long stream that both leads and trails the Clouds on the sky. This work makes predictions, which will be tested in future surveys, for the chemical abundances in the Leading Arm of the Stream. The Clouds' interaction history and their proximity to us suggest that they have undergone significant tidal stripping and may have been much more massive in the past. My work demonstrates how an LMC that was more massive would bring a significant amount of warm gas as it fell into the Milky Way. This gas will be the source of the missing ionized component of the Stream required to match the observations. Finally, I hypothesize the number of satellite dwarf galaxies that are expected to arrive with this massive LMC by examining analog galaxies in cosmological simulations. This result also has implications for our understanding of the satellite galaxy population of the Milky Way. This is a complete picture of the Magellanic System where the LMC entered the Milky Way as the largest galaxy of a group of dwarf galaxies with its own bound gas. The interactions between the LMC and SMC in this Magellanic Group combined with ram-pressure stripping from the Milky Way's hot halo create the long, high-mass Stream of ionized and neutral gas. The lessons we learn from the Magellanic Clouds will help us understand galaxy formation and evolution across the universe.
Galaxy Evolution Connecting The Distant Universe With The Local Fossil Record
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Author : Monique Spite
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Galaxy Evolution Connecting The Distant Universe With The Local Fossil Record written by Monique Spite 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.
This up-to-date review of the basic elements directly connected to the evolution of galaxies links data about remote galaxies to the observation of very old populations in our own galaxy. Young researchers and well-known specialists discuss the difficulties and remaining uncertainties of the problem.
The Mass Distribution And Assembly Of The Milky Way From The Properties Of The Magellanic Clouds
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Author :
language : en
Publisher:
Release Date : 2012
The Mass Distribution And Assembly Of The Milky Way From The Properties Of The Magellanic Clouds written by 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.
We present a new measurement of the mass of the Milky Way (MW) based on observed properties of its largest satellite galaxies, the Magellanic Clouds (MCs), and an assumed prior of a?CDM universe. The large, high-resolution Bolshoi cosmological simulation of this universe provides a means to statistically sample the dynamical properties of bright satellite galaxies in a large population of dark matter halos. The observed properties of the MCs, including their circular velocity, distance from the center of the MW, and velocity within the MW halo, are used to evaluate the likelihood that a given halo would have each or all of these properties; the posterior probability distribution function (PDF) for any property of the MW system can thus be constructed. This method provides a constraint on the MW virial mass, 1.2{sup +0.7} - {sub 0.4}(stat.){sup +0.3} - {sub 0.3}(sys.) x 1012 M {circle_dot} (68% confidence), which is consistent with recent determinations that involve very different assumptions. In addition, we calculate the posterior PDF for the density profile of the MW and its satellite accretion history. Although typical satellites of 1012 M {circle_dot} halos are accreted over a wide range of epochs over the last 10 Gyr, we find a ≈72% probability that the MCs were accreted within the last Gyr, and a 50% probability that they were accreted together.
Globular Clusters
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Author : C. Martinez Roger
language : en
Publisher: Cambridge University Press
Release Date : 1999-10-28
Globular Clusters written by C. Martinez Roger 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 1999-10-28 with Science categories.
An accessible introduction to globular clusters for graduate students, and a comprehensive and up-to-date reference for researchers.