Green Pea Galaxies

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Green Peas and SAM

Author : Samantha W. Brunker
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.4/5 (387 download)

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Book Synopsis Green Peas and SAM by : Samantha W. Brunker

Download or read book Green Peas and SAM written by Samantha W. Brunker and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green Pea galaxies are compact, extreme star-forming galaxies observed at intermediate redshifts (z = 0.15-0.4). Interest in the Green Pea galaxies has been steadily growing, especially once the Green Peas were discovered to exhibit escaping ionizing radiation. Green Pea galaxies have become prime analogs for studying the contributions of star-forming galaxies to reionization. Despite the intense interest in these unusual galaxies, there are several open questions regarding the nature of the Green Peas. This dissertation focuses on the KISSR Green Pea galaxies with the aim of addressing three outstanding questions regarding the Green Peas: (1) What is the range of characteristic properties of the Green Peas? (2) What triggered the starburst activity in the Green Peas? and (3) Why are the Green Peas low-metallicity systems? First, we confirm that the KISSR Green Pea galaxies are consistent with the properties of the original Green Pea galaxy sample. We show that the KISSR Green Peas are a factor of 17 times brighter than a typical star-forming galaxy of the same mass, which means 94% of the light is coming from the starburst population. Second, we designed and carried out a redshift survey using the Hydra multi-fiber positioner and Bench Spectrograph on the WIYN 3.5m telescope, which we used to investigate what impact a Green Pea's environment has on its star formation. We observed and measured redshifts for 1312 galaxies distributed between the 13 KISSR Green Pea fields. We used three density analysis techniques to quantify the galaxian densities around the KISSR Green Peas. Based on the combined results from these density analyses, we sorted the KISSR Green Peas into specific environment categories. We find that none of the KISSR Green Peas live in higher-density environments. A majority of them live in voids or in low-density environments tending towards isolation. We compare the measured densities for each Green Pea with several of their key physical properties. We find that there is no correlation between the galaxy properties and the galaxian densities, and we conclude that environment is not a strong factor in driving the star-formation activity in the KISSR Green Peas. Lastly, we present an analysis of the chemical compositions of the KISSR Green Peas. We successfully measured the weak [O III]A4363 emission line in 9 of the 13 KISSR Green Peas at a level that resulted in robust direct-method abundances. We confirm that the KISSR Green Peas are low-metallicity systems. We found that the Green Peas have slightly elevated N/O ratios, for which we propose a chemical evolution history that deviates from what is expected for "normal" star-forming galaxies. The multifaceted approach to studying Green Pea galaxies presented in this dissertation will provide a basis for a better understanding of the nature of Green Peas and how they fit into the larger narrative of galaxy formation and evolution.

Peas in a Pod

Author : Heather Rose Kurtz
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis Peas in a Pod by : Heather Rose Kurtz

Download or read book Peas in a Pod written by Heather Rose Kurtz and published by . This book was released on 2016 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Green Pea Galaxies

Author : Tianxing Jiang
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (115 download)

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Book Synopsis Green Pea Galaxies by : Tianxing Jiang

Download or read book Green Pea Galaxies written by Tianxing Jiang and published by . This book was released on 2018 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green pea galaxies are a class of rare, compact starburst galaxies that have powerful optical emission line [OIII]$\lambda$5007. They are the best low-redshift analogs of high-redshift (z$>$2) Lyman-alpha emitting galaxies (LAEs). They provide unique opportunities to study physical conditions in high-redshift LAEs in great detail. In this dissertation, a few physical properties of green peas are investigated. The first study in the dissertation presents star formation rate (SFR) surface density, thermal pressure in HII regions, and a correlation between them for 17 green peas and 19 Lyman break analogs, which are nearby analogs of high-redshift Lyman break galaxies. This correlation is consistent with that found from the star-forming galaxies at z $\sim$ 2.5. In the second study, a new large sample of 835 green peas in the redshift range z = 0.011 -- 0.411 are assembled from Data Release 13 of the Sloan Digital Sky Survey (SDSS) with the equivalent width of the line [OIII]$\lambda$5007 $>$ 300\AA\ or the equivalent width of the line H$\beta$ $>$ 100\AA. The size of this new sample is ten times that of the original 80 star-forming green pea sample. With reliable T$_e$-based gas-phase metallicity measurements for the 835 green peas, a new empirical calibration of R23 (defined as ([OIII]$\lambda$$\lambda$4959,5007 + [OII]$\lambda$$\lambda$3726,3729)/H$\beta$) for strong line emitters is then derived. The double-value degeneracy of the metallicity is broken for galaxies with large ionization parameter (which manifests as log([OIII]$\lambda$$\lambda$4959,5007/[OII]$\lambda$$\lambda$3726,3729) $\geq$ 0.6). This calibration offers a good way to estimate metallicities for extreme emission-line galaxies and high-redshift LAEs. The third study presents stellar mass measurements and the stellar mass-metallicity relation of 828 green peas from the second study. The stellar mass covers 6 orders of magnitude in the range 10$^{5}$ -- 10$^{11}$ M$_{\odot}$, with a median value of 10$^{8.8}$ M$_{\odot}$. The stellar mass-metallicity relation of green peas is flatter and displays about 0.2 - 0.5 dex offset to lower metallicities in the range of stellar mass higher than 10$^{8}$ M$_{\odot}$ compared to the local SDSS star-forming galaxies. A significant dependence of the stellar mass-metallicity relation on star formation rate is not found in this work.

Galaxies

Author :
Publisher : PediaPress
ISBN 13 :
Total Pages : 223 pages
Book Rating : 4./5 ( download)

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Book Synopsis Galaxies by :

Download or read book Galaxies written by and published by PediaPress. This book was released on with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Reinventing Discovery

Author : Michael Nielsen
Publisher : Princeton University Press
ISBN 13 : 0691202850
Total Pages : 272 pages
Book Rating : 4.6/5 (912 download)

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Book Synopsis Reinventing Discovery by : Michael Nielsen

Download or read book Reinventing Discovery written by Michael Nielsen and published by Princeton University Press. This book was released on 2020-04-07 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: How the internet and powerful online tools are democratizing and accelerating scientific discovery Reinventing Discovery argues that we are living at the dawn of the most dramatic change in science in more than three hundred years. This change is being driven by powerful cognitive tools, enabled by the internet, which are greatly accelerating scientific discovery. There are many books about how the internet is changing business, the workplace, or government. But this is the first book about something much more fundamental: how the internet is transforming our collective intelligence and our understanding of the world. From the collaborative mathematicians of the Polymath Project to the amateur astronomers of Galaxy Zoo, Reinventing Discovery tells the exciting story of the unprecedented new era in networked science. It will interest anyone who wants to learn about how the online world is revolutionizing scientific discovery—and why the revolution is just beginning.

Dwarf Galaxies: Keys to Galaxy Formation and Evolution

Author : Polychronis Papaderos
Publisher : Springer Science & Business Media
ISBN 13 : 3642220185
Total Pages : 347 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis Dwarf Galaxies: Keys to Galaxy Formation and Evolution by : Polychronis Papaderos

Download or read book Dwarf Galaxies: Keys to Galaxy Formation and Evolution written by Polychronis Papaderos and published by Springer Science & Business Media. This book was released on 2012-04-23 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dwarf galaxy research constitutes an extremely vibrant field of astrophysical research, with many long-standing questions still unsettled and new ones constantly arising. The intriguing diversity of the dwarf galaxy population, observed with advanced ground-based and space-borne observatories over a wide spectral window providing an unprecedented level of detail, poses new challenges for both observers and theoreticians. The aim of this symposium was to bring together these two groups to exchange ideas and new results on the many evolutionary aspects of and open issues concerning dwarf galaxies. The main topics addressed include: the birth of dwarf galaxies: theoretical concepts and observable relics across wavelengths and time, the morphological, structural and chemical evolution of dwarf galaxies, possible evolutionary connections between early-type and late-type dwarfs, the star formation history of dwarf galaxies and its dependence on intrinsic and environmental properties, the origin and implications of starburst activity in dwarf galaxies, the fate of dwarfish systems born out of tidally ejected matter in galaxy collisions.

Unveiling Galaxies

Author : Jean-René Roy
Publisher : Cambridge University Press
ISBN 13 : 1108417019
Total Pages : 311 pages
Book Rating : 4.1/5 (84 download)

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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.

The Universe in 100 Colors

Author : Tyler Thrasher
Publisher : Sasquatch Books
ISBN 13 : 1632174928
Total Pages : 293 pages
Book Rating : 4.6/5 (321 download)

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Book Synopsis The Universe in 100 Colors by : Tyler Thrasher

Download or read book The Universe in 100 Colors written by Tyler Thrasher and published by Sasquatch Books. This book was released on 2024-09-24 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the intersection of science, art, and design, this must-have coffee table book highlights 100 mind-blowing colors that you’ve likely never seen before. From Instagram sensation and self-described "mad scientist artist" Tyler Thrasher and creator of the popular Matter subscription box Terry Mudge, this book comes with a foreword by Hank Green. This gorgeous compendium contains 100 amazing colors that you might otherwise live your whole life unaware of. These colors exist in the strangest of places, and serve extremely specific functions in nature, or were human-made with one goal in mind. In this oversized, design-forward book you'll find entries for each of the 100 colors, organized in gradient order, with structural and impossible colors set at the end. Each entry has a 2-page spread with a full-page image of the color plus snappy descriptions, and easy-to-understand category symbols. Some entries include diagrams. Even includes structural colors and colors outside the range of human visibility! Also included is a brief introduction to color theory, a myth-busting section, plus index, glossary, and notes. Here is your universe in living color: Cosmic Latte: The average color of the universe. Dragon’s Blood: A tropical tree that bleeds red resin with incredible medicinal potential. Sonoluminescence: A color created by sound! Eigengrau: The color we perceive in the absence of light (and no, it's not "pitch black"). Perfect for anyone who loves science or art, and bursting with astonishing facts and stunning photography, The Universe in 100 Colors is a wonder for the senses.

Governing Knowledge Commons

Author : Brett M. Frischmann
Publisher :
ISBN 13 : 0199972036
Total Pages : 516 pages
Book Rating : 4.1/5 (999 download)

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Book Synopsis Governing Knowledge Commons by : Brett M. Frischmann

Download or read book Governing Knowledge Commons written by Brett M. Frischmann and published by . This book was released on 2014 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Knowledge commons" describes the institutionalized community governance of the sharing and, in some cases, creation, of information, science, knowledge, data, and other types of intellectual and cultural resources. It is the subject of enormous recent interest and enthusiasm with respect to policymaking about innovation, creative production, and intellectual property. Taking that enthusiasm as its starting point, Governing Knowledge Commons argues that policymaking should be based on evidence and a deeper understanding of what makes commons institutions work. It offers a systematic way to study knowledge commons, borrowing and building on Elinor Ostrom's Nobel Prize-winning research on natural resource commons. It proposes a framework for studying knowledge commons that is adapted to the unique attributes of knowledge and information, describing the framework in detail and explaining how to put it into context both with respect to commons research and with respect to innovation and information policy. Eleven detailed case studies apply and discuss the framework exploring knowledge commons across a wide variety of scientific and cultural domains.

Bunch of Amateurs

Author : Jack Hitt
Publisher : Crown
ISBN 13 : 0307393755
Total Pages : 290 pages
Book Rating : 4.3/5 (73 download)

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Book Synopsis Bunch of Amateurs by : Jack Hitt

Download or read book Bunch of Amateurs written by Jack Hitt and published by Crown. This book was released on 2012 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning with Ben Franklin's kite and leading all the way to the current TV hit "American Idol," Hitt argues that the nation's love of self-invented obsessives has always driven the country to rediscover the true heart of the American dream.

Lyman-alpha as an Astrophysical and Cosmological Tool

Author : Mark Dijkstra
Publisher : Springer Nature
ISBN 13 : 3662596237
Total Pages : 421 pages
Book Rating : 4.6/5 (625 download)

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Book Synopsis Lyman-alpha as an Astrophysical and Cosmological Tool by : Mark Dijkstra

Download or read book Lyman-alpha as an Astrophysical and Cosmological Tool written by Mark Dijkstra and published by Springer Nature. This book was released on 2019-11-12 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hydrogen Lyman-alpha line is of utmost importance to many fields of astrophysics. This UV line being conveniently redshifted with distance to the visible and even near infrared wavelength ranges, it is observable from the ground, and provides the main observational window on the formation and evolution of high redshift galaxies. Absorbing systems that would otherwise go unnoticed are revealed through the Lyman-alpha forest, Lyman-limit, and damped Lyman-alpha systems, tracing the distribution of baryonic matter on large scales, and its chemical enrichment. We are living an exciting epoch with the advent of new instruments and facilities, on board of satellites and on the ground. Wide field and very sensitive integral field spectrographs are becoming available on the ground, such as MUSE at the ESO VLT. The giant E-ELT and TMT telescopes will foster a quantum leap in sensitivity and both spatial and spectroscopic resolution, to the point of being able, perhaps, to measure directly the acceleration of the Hubble flow. In space, the JWST will open new possibilities to study the Lyman-alpha emission of primordial galaxies in the near infrared. As long as the Hubble Space Telescope will remain available, the UV-restframe properties of nearby galaxies will be accessible to our knowledge. Therefore, this Saas-Fee course appears very timely and should meet the interest of many young researchers.

The Crowd and the Cosmos

Author : Chris Lintott
Publisher : Oxford University Press
ISBN 13 : 0192579541
Total Pages : 280 pages
Book Rating : 4.1/5 (925 download)

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Book Synopsis The Crowd and the Cosmos by : Chris Lintott

Download or read book The Crowd and the Cosmos written by Chris Lintott and published by Oxford University Press. This book was released on 2019-10-24 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world of science has been transformed. Where once astronomers sat at the controls of giant telescopes in remote locations, praying for clear skies, now they have no need to budge from their desks, as data arrives in their inbox. And what they receive is overwhelming; projects now being built provide more data in a few nights than in the whole of humanity's history of observing the Universe. It's not just astronomy either - dealing with this deluge of data is the major challenge for scientists at CERN, and for biologists who use automated cameras to spy on animals in their natural habitats. Artificial intelligence is one part of the solution - but will it spell the end of human involvement in scientific discovery? No, argues Chris Lintott. We humans still have unique capabilities to bring to bear - our curiosity, our capacity for wonder, and, most importantly, our capacity for surprise. It seems that humans and computers working together do better than computers can on their own. But with so much scientific data, you need a lot of scientists - a crowd, in fact. Lintott found such a crowd in the Zooniverse, the web-based project that allows hundreds of thousands of enthusiastic volunteers to contribute to science. In this book, Lintott describes the exciting discoveries that people all over the world have made, from galaxies to pulsars, exoplanets to moons, and from penguin behaviour to old ship's logs. This approach builds on a long history of so-called 'citizen science', given new power by fast internet and distributed data. Discovery is no longer the remit only of scientists in specialist labs or academics in ivory towers. It's something we can all take part in. As Lintott shows, it's a wonderful way to engage with science, yielding new insights daily. You, too, can help explore the Universe in your lunch hour.

Astrophysics Of Gas Nebulae and Active Galactic Nuclei

Author : Donald E. Osterbrock
Publisher : University Science Books
ISBN 13 : 9781891389344
Total Pages : 488 pages
Book Rating : 4.3/5 (893 download)

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Book Synopsis Astrophysics Of Gas Nebulae and Active Galactic Nuclei by : Donald E. Osterbrock

Download or read book Astrophysics Of Gas Nebulae and Active Galactic Nuclei written by Donald E. Osterbrock and published by University Science Books. This book was released on 2006 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thoroughly revised and expanded throughout, the new edition is a graduate-level text and reference book on gaseous nebulae, nova and supernova remnants. Much of the new data and new images are from the Hubble Space Telescope with two wholly new chapters being added along with other new features. The previous edition which was tried and tested for thirty years has now been succeeded by a revised, updated, larger edition, which will be valuable to anyone seriously interested in astrophysics.

Bit by Bit

Author : Matthew J. Salganik
Publisher : Princeton University Press
ISBN 13 : 0691196109
Total Pages : 448 pages
Book Rating : 4.6/5 (911 download)

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Book Synopsis Bit by Bit by : Matthew J. Salganik

Download or read book Bit by Bit written by Matthew J. Salganik and published by Princeton University Press. This book was released on 2019-08-06 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This essential guide to doing social research in this fast-evolving digital age explains how the digital revolution is transforming the way social scientists observe behavior, ask questions, run experiments, and engage in mass collaborations.

Knowledge Games

Author : Karen Schrier
Publisher : JHU Press
ISBN 13 : 1421419211
Total Pages : 281 pages
Book Rating : 4.4/5 (214 download)

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Book Synopsis Knowledge Games by : Karen Schrier

Download or read book Knowledge Games written by Karen Schrier and published by JHU Press. This book was released on 2016-06-15 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Are games the knowledge-producers of the future? Imagine if new knowledge and insights came not just from research centers, think tanks, and universities but also from games, of all things. Video games have been viewed as causing social problems, but what if they actually helped solve them? This question drives Karen Schrier’s Knowledge Games, which seeks to uncover the potentials and pitfalls of using games to make discoveries, solve real-world problems, and better understand our world. For example, so-called knowledge games—such as Foldit, a protein-folding puzzle game, SchoolLife, which crowdsources bullying interventions, and Reverse the Odds, in which mobile game players analyze breast cancer data—are already being used by researchers to gain scientific, psychological, and humanistic insights. Schrier argues that knowledge games are potentially powerful because of their ability to motivate a crowd of problem solvers within a dynamic system while also tapping into the innovative data processing and computational abilities of games. In the near future, Schrier asserts, knowledge games may be created to understand and predict voting behavior, climate concerns, historical perspectives, online harassment, susceptibility to depression, or optimal advertising strategies, among other things. In addition to investigating the intersection of games, problem solving, and crowdsourcing, Schrier examines what happens when knowledge emerges from games and game players rather than scientists, professionals, and researchers. This accessible book also critiques the limits and implications of games and considers how they may redefine what it means to produce knowledge, to play, to educate, and to be a citizen.

The Road to Outsourcing 4.0

Author : Mohammadreza Akbari
Publisher : Springer Nature
ISBN 13 : 9819727081
Total Pages : 211 pages
Book Rating : 4.8/5 (197 download)

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Book Synopsis The Road to Outsourcing 4.0 by : Mohammadreza Akbari

Download or read book The Road to Outsourcing 4.0 written by Mohammadreza Akbari and published by Springer Nature. This book was released on with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Exploding Stars and Invisible Planets

Author : Fred Watson
Publisher : Columbia University Press
ISBN 13 : 0231540051
Total Pages : 332 pages
Book Rating : 4.2/5 (315 download)

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Book Synopsis Exploding Stars and Invisible Planets by : Fred Watson

Download or read book Exploding Stars and Invisible Planets written by Fred Watson and published by Columbia University Press. This book was released on 2020-01-14 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: What happens to space and matter near a black hole? Where did the moon come from? How do we know what stars are made of? Are we alone in the universe? In Exploding Stars and Invisible Planets, Fred Watson, an award-winning astronomer, presents the most up-to-date knowledge on hot topics in astronomy and space science, providing a fascinating and entertaining account of the latest research. Watson explains how to find invisible planets around other stars, why dark matter matters, and the future of citizen space travel, all while recounting the seismic shifts in understanding that have taken place during his illustrious career. The book features illuminating discussions of microbes in space; the dividing line between day and night; exploding stars and light echoes; fast radio bursts and signals from space; meteors, meteorites, and space dust; what happened to the Martian ocean; the seas and lakes of Titan; and the birth of the universe.