The Gaseous Arms of the Magellanic System and Other High Velocity Clouds PDF Download
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Author: Christian Brüns
Publisher:
ISBN:
Category : High-velocity clouds (Astrophysics)
Languages : en
Pages : 189
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Author: Christian Brüns
Publisher:
ISBN:
Category : High-velocity clouds (Astrophysics)
Languages : en
Pages : 189
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Book Description
Author: Drew Austen Ciampa
Publisher:
ISBN:
Category : Astrophysics
Languages : en
Pages : 115
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Book Description
Within our Galactic backyard, the Magellanic System, composed of the Large and Small Magellanic Clouds, is exchanging millions to billions of solar masses worth of material to the Milky Way. In two different studies, we explored this exchange and its impact on the Galactic environment. In the first study, a galactic outflow has erupted due to supernovae explosions within the disk. We present the first spectroscopically resolved H-alpha emission map of this wind. Kinematically, we find that the diffuse gas in the warm-ionized phase of the wind persists at both low (100km/s) and high (100km/s) velocities, relative to the LMC's HI disk. Furthermore, we find that the high-velocity component spatially aligns with the most intense star-forming region, 30~Doradus. We, therefore, conclude that this high-velocity material traces an active outflow. This wind is ejecting an estimated log(Mionized/Mo)=7.51 +/- 0.15 worth of material off the near-side of the galaxy. The second study observes tidally stripped gas that leads the LMC's orbit. This material formed into a massive complex called the Leading Arm that contains multiple sub-structures of gas. We investigate the physical and ionization conditions of this structure using Hubble Space Telescope/Cosmic Origins Spectrograph UV absorption-line and 21\,cm \hi\ emission-line observations along 13 sightlines. Additionally, we use Cloudy radiative transfer modeling to estimate their average temperatures, densities, ionization fractions, and thermal pressures. We find that most Leading Arm sub-structures exhibit multiple absorbers along their lines of sight, indicating a complex three-dimensional structure. Using the ionization fractions, we estimate that the total (neutral plus ionized) hydrogen mass of the LA sub-structures is M_H=3.0x10^8 Mo across a velocity range of +100
Author: Hugo van Woerden
Publisher: Springer Science & Business Media
ISBN: 1402025793
Category : Science
Languages : en
Pages : 414
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Book Description
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.
Author: Bengt E. Westerlund
Publisher: Cambridge University Press
ISBN: 9780521480703
Category : Science
Languages : en
Pages : 304
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Book Description
The first book to provide a synthesised and comprehensive account of the Magellanic Clouds.
Author: Space Telescope Science Institute (U.S.). Symposium
Publisher: Cambridge University Press
ISBN: 9780521847599
Category : Science
Languages : en
Pages : 248
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Book Description
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Author: Hugo van Woerden
Publisher: Springer Science & Business Media
ISBN: 9781402025785
Category : Science
Languages : en
Pages : 424
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Book Description
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.
Author: Brianna Marie Smart
Publisher:
ISBN:
Category :
Languages : en
Pages : 106
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Book Description
Our understanding of galaxies is limited by our place within the Milky Way and the vast distances to external galaxies. However, our proximity to the Magellanic Clouds, a pair of nearby galaxies in our Galaxy's halo, provides an opportunity to closely examine and survey a galactic system. Many surveys have been conducted of this system, giving a thorough look into some components of the galaxies and providing constraints to dynamic models of the system. But surveys of the ionized gas throughout the Magellanic System have been primarily limited to bright H II regions near young, hot stars and the energetic remnants of recent supernovae. Using the Wisconsin H-Alpha Mapper (WHAM), I have conducted the first survey of diffuse ionized gas throughout the extended Magellanic System, adding an essential view of a key component. First, I present the first extended diffuse ionized gas map of the Small Magellanic Cloud, which includes new kinematic information about the motion of this gas far from the center of the galaxy. Using these results, I calculate the first estimate of the total ionized gas around the SMC. Next, I present a survey of the Large Magellanic Cloud. Using methods developed from the Small Magellanic Cloud survey, I present the first extended diffuse ionized gas maps of the Large Magellanic Cloud and calculated the total ionized gas mass. Finally, I discuss the initial results of an H-alpha survey of Magellanic Stream that I designed and carried out. Covering a large region of the sky (40 by 120 degrees), this is the first attempt to detect and characterize the full extent of ionized gas within the Magellanic Stream. To highlight the progress of the survey reduction, I present four regions along the Stream and compare emission from neutral and ionized components. Together, these studies give new insight into the complex structure of the Magellanic System, explore the warm ionized medium in an interacting galactic system with unprecedented sensitivity, and produce new, more accurate estimates of the total ionized gas mass around the galaxies, providing important constraints for dynamic models of the system.
Author: International Astronomical Union. Symposium
Publisher: Astronomical Society of the Pacific
ISBN:
Category : Magellanic Clouds
Languages : en
Pages : 636
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Book Description
Author: Wilko van Holten
Publisher: Peter Lang Gmbh, Internationaler Verlag Der Wissenschaften
ISBN: 9783631508121
Category : Philosophy
Languages : en
Pages : 564
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Book Description
This book deals with the question of whether religious worldviews fulfil an explanatory function in the lives of believers. After rebutting some common objections to this claim, the author proposes to understand the explanatory nature of religious belief along the lines of inference to the best explanation. This proposal is qualified in view of the peculiar nature of religious belief: It is stressed that the type of explanation concerned occurs within the bounds of religion alone, and loses its sense apart from the religious form of life. In unfolding his argument, the author draws heavily on ideas of explanation developed in the philosophy of science, pointing to differences and comparisons between religious and scientific explanations. The author concludes by considering some specific things that theism explains.
Author: B. P. Wakker
Publisher:
ISBN:
Category : Galactic halos
Languages : en
Pages : 10
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Book Description
