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High-Velocity Clouds

The great abundance of galactic high-velocity clouds indicates that they are
important for the evolution of the Galaxy. It also suggests that other galaxies must
contain neutral hydrogen clouds with kinematics very different from that of a
settled ...

Author : Hugo van Woerden

Release : 2006-01-28

Publisher : Springer Science & Business Media

ISBN : 1402025793

File Size : 85.99 MB

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On the occasion of the retirement of Ulrich Schwarz, a symposium was held in Groningen in May of 1996, celebrating his contributions to the study of the int- stellar medium, including his work on the high-velocity clouds. The coming together of many specialists in the latter ?eld prompted the idea of compiling a book c- taining their contributions, and summarizing the status of our understanding of the high-velocity cloud phenomenon. This seemed especially worthwhile at the time, since many exciting developments were taking place. After the discovery of some H i clouds with high velocities, about 40 years ago, the subject had been dominated by 21-cm observations of H i emission. Starting in the mid-1980s much progress was being made because of the availability of new instruments, such as large ground-based optical telescopes and UV observatories in space. The connections between the work on high-velocity clouds and other studies of the properties of the (hot) interstellar medium also became clearer.

Stromlo Workshop on High-Velocity Clouds

Author : Brad K. Gibson

Release : 1999

Publisher : Astronomical Society of the pacific


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Literature 1980

028 High-Velocity Clouds Galaxies 131 - 262 High-velocity Clouds Kinematics
158. 112 High-velocity Clouds Nearby Galaxies 131. 106 High-velocity Clouds
Neutral Hydrogen 131 - 090 - 106 132.028 High-velocity Clouds Quasars 158.

Author : Siegfried Böhme

Release : 2013-04-18

Publisher : Springer Science & Business Media

ISBN : 3662123258

File Size : 25.83 MB

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Transactions of the International Astronomical Union: Reports on Astronomy

low-latitude high-velocity clouds. These stars are useful for estimating cloud
distances from the interstellar absorption lines. Kerr and Knapp (07.131.132)
have looked for high-velocity hydrogen in the direction of six globular clusters
whose ...

Author : C. de Jager

Release : 2012-12-06

Publisher : Springer Science & Business Media

ISBN : 9401025878

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This volume contains the fifteenth tri-annual reports of the Presidents of the forty Commissions of the International Astronomical Union; it refers to the progress in our discipline during the three years 1970, 1971 and 1972. As compared to earlier volumes a gradual change in character is unmistakable. The ever increasing flow of publications, combined with the obvious necessity to keep the Reports at a reasonable size and price level has gradually forced the Commission Presidents to be more selective than before in drafting their Reports. I have certainly stimulated them into that direction - in order that Reports like these be valuable and lasting, it seems imperative that the individual contributions have the character of a critical overall review, where a fairly complete summary is given of the major develop ments and discoveries of the past three years, and in which the broad developments and new trends be clearly outlined, while at the same time essential problems for future research are identified. With respect to the latter item I have suggested the Commission Presidents to add to their reports a brief section on scientific priorities for future research in the field of their Commissions. In order to save space I have suggested to Commission Presidents that references to published papers are given on the basis of their number in the published issues of Astronomy and Astrophysics Abstracts. For instance, the indication (06. 078. 019) or (AAA 06. 078.

The Magellanic Clouds

In order to compare the HI and stellar velocities , we display , in Figure 1 , the
average heliocentric HI velocities ... There are some low - velocity clouds east of
the but they count for only a few percents of the total HI density this can easily be

Author : Raymond Haynes

Release : 1991-02-28

Publisher : Springer Science & Business Media

ISBN : 9780792311102

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Symposium 148 "The Magellanic Clouds and their Dynamical Interaction with the Milky Way" was the first IAU Symposium held in Australia since 1973. In all, 23 countries were represented by 149 participants. The Symposium was held from July 9 to 13, 1990 at Womens College, the University of Sydney. The last symposium on the Magellanic Clouds' was held in 1983 in Ttibingen, Germany. Since then new ground-and satellite-based instruments have become available. A range of results from these instruments were presented at IAU Symposium 148 and are published in these proceedings. IAU Symposium 148 was timed to coincide with the commissioning of the Australia Telescope, and indeed, a few of the first results from that instrument were presented at this Symposium Over the next decade the Australia Telescope is destined to make a major impact on Magellanic Cloud research. Papers are arranged in five main sections reflecting the Symposium timetable: • Large-Scale Structure and Kinematics • Star Formation and Clustering • Stellar Evolution • The Interstellar Medium • The LMC-SMC-Galaxy System These are preceeded by both the introduction to and the summary of the Symposium. Questions and answers from the oral sessions are reproduced at the end of each section.

The Formation of the Milky Way

The impacts of high - velocity clouds ( HVCs ) can be important in shaping the
galactic Hi layer and in locally triggering star formation ( Heiles 1984 ; Tenorio -
Tagle & Bodenheimer 1988 ; Franco et al . 1988 ; Alfaro et al . 1991 ; Comerón ...

Author : Spain) Iaa-Iac-University of Pisa Workshop (1994 Granada

Release : 1995-08-03

Publisher : Cambridge University Press

ISBN : 9780521481779

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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).

The Galaxies of the Local Group

17.1 Introduction Gaseous material is expected to flow into galaxies by the
capture of highvelocity clouds (Oort 1966, 1970). Oort estimated that the mass of
the Milky Way system might be increasing by ∼1% per Gyr as a result of such

Author : Sidney Bergh

Release : 2000-05-15

Publisher : Cambridge University Press

ISBN : 9781139429658

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The Local Group is a small cluster of galaxies that includes the Milky Way. At least half of all galaxies in the Universe are thought to belong to similar groups. This authoritative volume provides a comprehensive synthesis of what is known about the Local Group. It begins with a summary of each member galaxy, as well as those galaxies previously regarded as possible members. The book examines the mass, stability and evolution of the Local Group as a whole and includes many important previously unpublished results and conclusions. With clarity, Professor van den Bergh provides a masterful summary of all that is known about the galaxies of the Local Group and their evolution, and expertly places this knowledge in the wider context of on-going studies of galaxy formation and evolution, the cosmic distance scale, and the conditions in the early Universe.

How does the Galaxy work?

HALO C. Konz,1,2 G. T. Birk, 2 & H. Lesch2 1Max-Planck-Institute for Plasma
Physics, Germany 2Uni-Sternwarte M ̈unchen, Germany Abstract The stability of
cold ...

Author : Emilio Javier Alfaro

Release : 2006-03-30

Publisher : Springer Science & Business Media

ISBN : 140202620X

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TheinternationalconferenceHowdoestheGalaxywork? Agalactictertulia rd th with Don Cox and Ron Reynolds, was held during the week of 23 to 27 of June 2003 in the marvelous city of Granada, Spain. This week marked the beginningofoneofthehottestsummersthatwehaveeverlived, butincontrast, the meeting was one of the coolest events that we can remember! First, it certainly wasa?rstclassscienti?creunion, withanexcellent program, talented speakers, and alive discussions in a friendly atmosphere. Second, the whole event was embedded in the passionate Andalucian way of life, a true tertulia, well seasoned with tasty tapas and perfectly marinated in cool and dry sherry wine. Third, the celebration was framed by some of the most beautiful settings thatonecanimagine; weenjoyedthemagni?centsplendoroftheAlhambra,the unique Muslim-Jewish-Christian ?avor of the Albaicin, and the magical gipsy heartbeat of Sacromonte. Last but not least, all discussions, whether they were duringthesessionsoratabartable,weresprinkledwiththecharmandwitofthe twoguestsofhonor: DonCoxandRonReynolds. Theideaofhavingascienti?c feast to celebrate their 60th birthday in Granada was actually conceived at a bar table in Seville, with plenty of manzanilla at hand, a couple of summers ago. That, perhaps, was the dif?cult part of the project. The rest was relatively easy to achieve because Don and Ron are not only remarkable astronomers but they are also great human beings. Indeed, we had a very positive response from all parties involved: every person we talked to was enthusiastic about the celebration, and wanted to give their own point of view in this tertulia.

Spectroscopy of Astrophysical Plasmas

Spitzer noted that stars at z distances exceeding 0.5 kpc more frequently exhibit
high velocity interstellar Ca II optical absorption lines than do stars at smaller z .
He concluded that an appreciable fraction of the high - velocity clouds producing

Author : A. Dalgarno

Release : 1987-06-11

Publisher : Cambridge University Press

ISBN : 9780521269278

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A group of acknowledged experts describe the use of spectroscopy as a diagnostic probe of astronomical environments. The broad sweep of the book enables good coverage to be given to all the situations in which plasmas are encounteres in astronomical investigations. Specifically, the articles include quasars, Seyfert galaxies, active galactic nuclei, the solar chromosphere and corona, galactic HII regions, circumstellar shells, interstellar gas, supernova remnants and interstellar clouds. The book includes an account of the basic aspects of spectroscopy in a chapter on laboratory astrophysics. The book was stimulated by the extraordinary contributions to astronomical spectroscopy of Leo Goldberg, and is dedicated to him. Throughout, this book is written with the needs of students in astronomy and astrophysics in mind. Each chapter includes a summary or conclusions about the future direction of research. Furthermore there are extensive bibliographies. This textbook is therefore an excellent introduction to research in astrophysics and it will act as a pathfinder to the primary literature.

The IGM/Galaxy Connection

The high velocity O VI traces tidal interactions with the Magellanic Clouds,
accretion of gas, outflowing material from the Galactic disk, warm/hot gas
interactions in a highly extended Galactic corona, and intergalactic gas in the
Local Group.

Author : Jessica L. Rosenberg

Release : 2003-04-30

Publisher : Springer Science & Business Media

ISBN : 9781402012891

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This volume contains the proceedings of the meeting entitled, "The IGM/Galaxy Connection: The Distribution of Baryons at z = 0. " The meeting was held August 8 -10 at the National Center for Atmospheric Research (NCAR) located in Boulder, Colorado on the foothills of the Rocky Mountains (see conference photo). We organized this meeting because we felt it was time to address the link between galaxies and the intergalactic medium at low redshift. In this vein, we posed several questions to the conference participants: Where are the baryons in the local universe and in what phase do they reside? What signatures of galaxy evolution have been imprinted on the IGM? What percentage of intergalactic gas is left from the galaxy formation process? What does the distribution of baryons at z = 0 tell us about the early universe? The conference was an overwhelming success with lots of friendly interaction and discussion among the participants. At lunch we were treated to splendid views from the NCAR terrace and discussions rang ing from the importance of the LSR, GSR, and LGSR velocity frames to how long the desserts would last with 90 astronomers and the hot Boul der sun. From an inventory of the baryons, to the associations between galaxies and Lya absorbers, to the mechanisms by which galaxies obtain and lose gas, the conference covered many topics. The results of these endeavors are contained in these pages and eloquently summarized by Chris Impey.

Stellar Populations

Astronomy Observatory^ P.O. Box 2 ... 21 cm HI profiles away from the Galactic
plane found not only the emission near zero velocity expected from gas in the ...

Author : Piet C. van der Kruit

Release : 1995-06-30

Publisher : Springer Science & Business Media

ISBN : 9780792335375

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The concept of Stellar Populations has played a fundamental role in astronomy in the last few decades. It was introduced by Walter Baade after he was able to resolve the Andromeda Nebula and its companions into stars when he used red-sensitive plates and realised that there were two fundamentally different Herzsprung-Russell diagrams in our and these nearby galaxies (common stars in the solar neighborhood versus globular clusters). This result was published in two papers in 1944 in volume 100 of the Astrophysical Journal. Subsequent research gave the concept a much firmer basis and at the famous Vatican Symposium of 1957 resulted in a general scheme of the concept and a working hypothesis for idea's on the formation and evolution of the Galaxy. This has been a guiding principle of studies of our and other galaxies for decades. Some years ago it seemed to us appropriate to commemorate Baade's seminal work in 1994, when it would have its 50-th anniversary, and to review its present status and also its role in contempory understanding. While we were in Leiden for an administrative committee, we discussed the matter again and over beers on October 29, 1991 we decided the take the initiative for an IAU Symposium on the subject during the 1994 IAU General Assembly in Den Haag, the Netherlands.

Galaxy Interactions at Low and High Redshift

These proceedings offer professional astronomers an overview of the rapidly advancing subject of galaxy interactions at low and high redshifts.

Author : J.E. Barnes

Release : 2012-12-06

Publisher : Springer Science & Business Media

ISBN : 9401146659

File Size : 36.80 MB

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These proceedings offer professional astronomers an overview of the rapidly advancing subject of galaxy interactions at low and high redshifts. The symposium gave participants an exciting glimpse of a developing synthesis highlighting galactic encounters and their role in the history of the Universe.

Evolution of Interstellar Matter and Dynamics of Galaxies

Magnetic Field Geometry Towards the High Velocity Clouds (HVCs) A.I. GOMEZ
McMaster University, *Université de Montreal 1 INTRODUCTION The origin of the
High ...

Author : J. Palous

Release : 1992-07-02

Publisher : Cambridge University Press

ISBN : 9780521419840

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Proceedings of the international workshop on the 'Evolution of Interstellar Matter and Dynamics of Galaxies'.

The Birth of Stars and Planets

One source of high - velocity clouds is the tail of tidal debris torn out of our closest
extragalactic neighbors : the Large and Small Magellanic Clouds visible from the
southern hemisphere . These small , irregular galaxies orbit our Milky Way as ...

Author : John Bally

Release : 2006-08-24

Publisher : Cambridge University Press

ISBN : 9780521801058

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Publisher description

A Decade of Hubble Space Telescope Science

... Spectrograph (GHRS) have permitted very accurate measurements of the gas
phase abundances and physical conditions in interstellar clouds found in the
Galactic disk and low halo and of the matter in several Galactic high velocity

Author : Space Telescope Science Institute (U.S.). Symposium

Release : 2003-06-26

Publisher : Cambridge University Press

ISBN : 9780521824590

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Summary of the achievements of the Hubble Space Telescope in its first decade of operation.