Download or read book Large Scale Structure of the Neutral Hydrogen in the Galaxy written by A. Peter Henderson and published by . This book was released on 1967 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Large Scale Structure of the Neutral Hydrogen in the Galaxy written by Brother A. Peter Henderson and published by . This book was released on 1967 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Large Scale Structure of the Neutral Hydrogen in the Galaxy written by A. Peter Henderson (Brother) and published by . This book was released on 1967 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evolution of Neutral Hydrogen Properties of Galaxies With Respect to Large Scale Structure Over One Third the Age of the Universe written by Julia AM. Blue Bird and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We find that our data follow known scaling relations. Both theory and observations suggest that large-scale structure impacts galaxy evolution in addition to known trends in local density. We find that galaxy spins tend to be aligned with cosmic web filaments and a hint of the predicted transition mass associated with the spin angle alignment. With our second epoch of data from the CHILES survey, we probe the high-redshift regime. We present two new HI detections at z = 0.257 and z = 0.258, plus a stacked result at z ∼ 0.36. We combine these results with the previously published CHILES samples. This provides, for the first time, a continuous look at directly detected HI in emission over redshift range 0
Download or read book The Large scale Distribution of Neutral Hydrogen in the Local Universe written by Virginia Alexandra Kilborn and published by . This book was released on 2001 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fine scale Structure of the Neutral Hydrogen Absorption in NGC1275 written by Jonathan Daniel MacLeish Romney and published by . This book was released on 1979 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutral Hydrogen In the Local Universe written by Ann Martin and published by . This book was released on 2011 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: We make use of the sensitivity and large sample size of the Arecibo Legacy Fast ALFA (ALFALFA) survey to investigate statistical properties of HI-selected galaxies in the local universe. This ongoing survey will eventually produce a census of over 30,000 gas-rich galaxies. The partial sample available for this work contains over 10,000 galaxies, making it twice as large as the previous generation blind HI survey, HIPASS. We have characterized the survey sensitivity and the selection function for use in the analyses presented in this dissertation, and are therefore able to make robust estimates of the characteristics of the galaxy population sampled by ALFALFA. From the available sample, we derive the HI mass function at redshift z = 0 via both the 1/Vmax and 2DSWML methods, which are in extremely close agreement with each other. These measurements are influenced by the survey design and the cosmological volume sampled, and we investigate and describe the magnitude and characteristics of the imprint of large-scale structure, survey sensitivity, and distance errors on the HI mass function. Our finding that there are more galaxies with high HI masses on the extreme end of the distribution will alter predictions for future large-scale 21 cm line surveys with such instruments as the Square Kilometer Array (SKA). The large volume and sample size of ALFALFA also allows study of the dependence of the HI mass function on galaxy environments at various scales by splitting into subsamples. This work confirms that the distribution of HI mass does change with environment and indicates that there is some threshold density beyond which the HI reservoirs of dwarf galaxies are efficiently removed, thereby flattening the HI mass function. The scale and degree of clustering for HI-selected galaxies is probed through the galaxy-galaxy two-point correlation function. Again, the large size of the ALFALFA galaxy catalog allows the sample to be split. The correlation function can thus be investigated as a function of HI mass, resolving a discrepancy from the HIPASS analysis, and as a function of optical luminosity and color. We find that HI-selected galaxies, and low HI mass galaxies in particular, are the most weakly clustered population of galaxies known to exist. For HI-selected galaxies, hydrogen mass more reliably distinguishes between environments on large scales than optical properties do, but on small scales these galaxies cluster similarly regardless of HI mass. The clustering scale of HI-selected galaxies at low redshift will help to disentangle the influence of environment on galaxy evolution, and to constrain the populations to which future large 21 cm line surveys will be sensitive. The robust measurement of the statistical properties of gas-rich galaxies at low redshifts provided in this dissertation will be used to improve simulations and models that predict the characteristics of this population of galaxies. In the case of the correlation function, we show that the clustering observed in ALFALFA can distinguish between popular models of star formation that predict the present-day distribution of gas in simulated galaxies. We suggest future projects that will further our understanding of the interplay between HI and optical properties and galaxy environment, while also providing robust observables for comparison to models.
Download or read book Galactic Astronomy written by James Binney and published by Princeton University Press. This book was released on 2021-07-13 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the definitive treatment of the phenomenology of galaxies--a clear and comprehensive volume that takes full account of the extraordinary recent advances in the field. The book supersedes the classic text Galactic Astronomy that James Binney wrote with Dimitri Mihalas, and complements Galactic Dynamics by Binney and Scott Tremaine. It will be invaluable to researchers and is accessible to any student who has a background in undergraduate physics. The book draws on observations both of our own galaxy, the Milky Way, and of external galaxies. The two sources are complementary, since the former tends to be highly detailed but difficult to interpret, while the latter is typically poorer in quality but conceptually simpler to understand. Binney and Merrifield introduce all astronomical concepts necessary to understand the properties of galaxies, including coordinate systems, magnitudes and colors, the phenomenology of stars, the theory of stellar and chemical evolution, and the measurement of astronomical distances. The book's core covers the phenomenology of external galaxies, star clusters in the Milky Way, the interstellar media of external galaxies, gas in the Milky Way, the structure and kinematics of the stellar components of the Milky Way, and the kinematics of external galaxies. Throughout, the book emphasizes the observational basis for current understanding of galactic astronomy, with references to the original literature. Offering both new information and a comprehensive view of its subject, it will be an indispensable source for professionals, as well as for graduate students and advanced undergraduates.
Download or read book Observations of Neutral Hydrogen in an Interior Region of the Galaxy written by William Whitney Shane and published by . This book was released on 1971 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Planets Stars and Stellar Systems written by Gerard Gilmore and published by Springer. This book was released on 2013-02-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is volume 5 of Planets, Stars and Stellar Systems, a six-volume compendium of modern astronomical research, covering subjects of key interest to the main fields of contemporary astronomy. This volume on “Galactic Structure and Stellar Populations”, edited by Gerard F. Gilmore, presents accessible review chapters on Stellar Populations, Chemical Abundances as Population Tracers, Metal-Poor Stars and the Chemical Enrichment of the Universe, The Stellar and Sub-Stellar Initial Mass Function of Simple and Composite Populations, The Galactic Nucleus, The Galactic Bulge, Open Clusters and Their Role in the Galaxy, Star Counts and the Nature of Galactic Thick Disk, The Infrared Galaxy, Interstellar PAHs and Dust, Galactic Neutral Hydrogen, High-Velocity Clouds, Magnetic Fields in Galaxies, Astrophysics of Galactic Charged Cosmic Rays, Gamma-Ray Emission of Supernova Remnants and the Origin of Galactic Cosmic Rays, Galactic Distance Scales, Globular Cluster Dynamical Evolution, Dynamics of Disks and Warps, Mass Distribution and Rotation Curve in the Galaxy, Dark Matter in the Galactic Dwarf Spheroidal Satellites, and History of Dark Matter in Galaxies. All chapters of the handbook were written by practicing professionals. They include sufficient background material and references to the current literature to allow readers to learn enough about a specialty within astronomy, astrophysics and cosmology to get started on their own practical research projects. In the spirit of the series Stars and Stellar Systems published by Chicago University Press in the 1960s and 1970s, each chapter of Planets, Stars and Stellar Systems can stand on its own as a fundamental review of its respective sub-discipline, and each volume can be used as a textbook or recommended reference work for advanced undergraduate or postgraduate courses. Advanced students and professional astronomers in their roles as both lecturers and researchers will welcome Planets, Stars and Stellar Systems as a comprehensive and pedagogical reference work on astronomy, astrophysics and cosmology.
Download or read book Structure and Kinematics of Neutral Hydrogen in External Galaxies written by John Francis Dean and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Large scale Characteristics of the Galaxy written by William Butler Burton and published by Springer Science & Business Media. This book was released on 1979-09 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: International Astronomical Union. Union astronomique internationale.
Download or read book The Large Scale Structure of the Universe written by Malcolm S. Longair and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The significance of the present IAU symposium, "The Large Scale Structure of the Universe", fortunately requires no elaboration by the editors. The quality of the wide range of observational and theoretical astrophysics contained in this volume speaks for itself. The published version of the proceedings contains all the contributions presented at the symposium with the exception of the introductory lecture by V. A. Ambartsumian. Contributed papers, short contributions and discussions have been included according to the recommendations of the IAU. Many people contributed to the success of the symposium. First of all, thanks are due to the USSR Academy of Sciences and to the Estonian Academy of Sciences for sponsoring this symposium in Tallinn. The efforts of Academician K. Rebane, President of the Estonian Academy of Sciences, are particularly appreciated. The astronomical hosts of the symposium were the members of the W. Struve Astrophysical Observatory of Tartu who made outstanding efforts to lavish participants with Estonian hospitality which was greatly appreciated and enjoyed by them and their guests. The members of the Scientific and Local Organising Committees are listed below and we thank all of them for their contributions which were central to the success of the symposium. In addition are listed members of the Technical Organising Committee who were responsible for all details of the organisation and whose vigilance ensured that all aspects of the symposium ran smoothly and efficiently. Their contributions are all gratefully acknowledged.
Download or read book International Workshop on Large Scale Structure in the Universe Potsdam 18 24 September 1994 written by Jan P. Mucket and published by World Scientific. This book was released on 1995 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Evolution of Galaxies Through the Neutral Hydrogen Window written by Robert Minchin and published by American Institute of Physics. This book was released on 2008-08-14 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This conference brought together observers and theorists to discuss what we are learning from the current generation of extragalactic neutral hydrogen observations and what prospects lie ahead, with particular emphasis on the exciting prospects for the next 3 to 10 years with the major U.S. facilities.
Download or read book A Neutral Hydrogen Study of Close and Wide Galaxy Pairs written by Tyler Eugene Nordgren and published by . This book was released on 1997 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Galaxy Formation written by Malcolm S. Longair and published by Springer Science & Business Media. This book was released on 1998-10-20 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a well-known astrophysicist, who is also a superbly talented writer, this work deals with the matter and radiation content of the universe, the formation of galaxies, and provides a comprehensive introduction into relativistic astrophysics as needed for the clarification of cosmological ideas.
