Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Massive Star Formation At High Angular Resolution full books in PDF, epub, and Kindle. Read online Massive Star Formation At High Angular Resolution ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Peter K. Sollins
Publisher :
ISBN 13 :
Total Pages : 163 pages
Book Rating : 4.:/5 (625 download)
Download or read book Accretion and Outflow in Massive Star Formation written by Peter K. Sollins and published by . This book was released on 2005 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Diethard Peter
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (37 download)
Download or read book Massive Star Formation at High Angular Resolution written by Diethard Peter and published by . This book was released on 2008 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M.S. Nanda Kumar
Publisher : Springer Science & Business Media
ISBN 13 : 0387263578
Total Pages : 232 pages
Book Rating : 4.3/5 (872 download)
Download or read book Cores to Clusters written by M.S. Nanda Kumar and published by Springer Science & Business Media. This book was released on 2008-04-07 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: It was with pleasure that CAUP became for three days the core to the cloud of star formation experts all over the world. Close to the celebration of its 15th anniversary – therefore still in the early stages of institutional evolution – we are proud of our multiple activities in Astronomy: a productive research centre, classi?ed as “Institution of excellence” within the Portuguese research units, but also an “Institution of Public Utility” as recognised by the Government. Fifteen years ago we choose to play a role not only in research, as expected from any research centre but also in the training of the future astronomers and the promotion of science and scienti?c culture. This choice is clearly stated in our by-laws and also in the multiple activities we have carried out since. Along the years we have organized on a regular basis international Workshops similar to “Cores to Clusters”. Sometimes we have chosen to organize int- national conferences of a larger size. On other occasions the choice has been for smaller and more informal discussion meetings. Or even doctoral schools with very different objectives. In common all those meetings have always had, besides the formal registered participants, a group of informal participants, our undergraduate students of Astronomy, so eager to be in touch with the real world.
Author : Henrik Beuther
Publisher :
ISBN 13 :
Total Pages : 514 pages
Book Rating : 4.F/5 ( download)
Download or read book Massive Star Formation written by Henrik Beuther and published by . This book was released on 2008 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carlos M. Poventud Estrada
Publisher :
ISBN 13 :
Total Pages : 250 pages
Book Rating : 4.:/5 (434 download)
Download or read book Study of the Earliest Stages of High-mass Star Formation Through High-angular Resolution Spectral Line Observations written by Carlos M. Poventud Estrada and published by . This book was released on 2009 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : International Astronomical Union. Symposium
Publisher : Astronomical Society of the Pacific
ISBN 13 :
Total Pages : 568 pages
Book Rating : 4.X/5 (4 download)
Download or read book Star Formation at High Angular Resolution written by International Astronomical Union. Symposium and published by Astronomical Society of the Pacific. This book was released on 2004 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roberto J. Galván-Madrid
Publisher : Springer Science & Business Media
ISBN 13 : 1461433088
Total Pages : 131 pages
Book Rating : 4.4/5 (614 download)
Download or read book On the Formation of the Most Massive Stars in the Galaxy written by Roberto J. Galván-Madrid and published by Springer Science & Business Media. This book was released on 2012-06-08 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most massive stars in the galaxy - those with more than 15 to 20 solar masses - are lilkely to ionize their surroundings before they reach their final mass. How can they accrete in spite of the presence of over-pressurized gas? This thesis presents results of Submillimeter Array (SMA) and Very Large Array (VLA) studies of massive star formation regions in the early stages of ionization, as well as an analysis of numerical simulations of the evolution of these young HII regions. The results favor a picture in which very massive stars form in accretion flows that are partially ionized and that keep accreting material from their environment.
Author : José Ignacio Añez López
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)
Download or read book Observational and Theoretical Perspective of Massive Star Formation written by José Ignacio Añez López and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we are aimed to better understand the massive star formation process paying special attention to the role of the magnetic field. To do this, we will carry out a multi-scale analysis with a double approach, theoretical and observational. a) The role of the magnetic field in the fragmentation process: the case of G14.225-0.506 In this first work, we study the fragmentation of an infrared dark cloud that has a filamentary structure and two hubs. We will pay special attention to the magnetic field present in the environment of the hubs and we will try to relate it to the different levels of fragmentation that these hubs present. In order to carry out this study, we present the result of the CSO observations at 350 um, towards both hubs, North and South, in the infrared dark cloud G14.225-0.506 (from here G14.2). We also show the analysis of polarization and intensity gradient making use of the method developed by Koch et al. 2012, Koch et al. 2012b. In the N-hub we find a magnetic field with a uniform distribution along the east-west direction. However, in the southern hub the B-field shows a bimodal distribution. The intensity-gradient in the N-hub shows a single local minimum. In the S-hub, the intensity gradient reveals two minima reflecting the bimodal distribution of the magnetic field where each component points to each of the minima of the intensity gradient. Analysis of the maps |delta| and Sigma_B in the N-hub indicates that, in the vicinity of the hub, gravity dominates the magnetic field. We have also estimated the intensity of the magnetic field finding higher values in the N-hub than in the S-hub. This supports the idea that the different levels of fragmentation exhibited by hubs depend on differences in magnetic field. b) Modeling the accretion disk around the high-mass protostar GGD 27-MM1 In this second project, we descend to accretion disk scales to understand how massive stars form and evolve. In this work we have used ALMA observations at a wavelength of 1.14~mm with very high angular resolution that resolve the disk around the massive star GGD27-MM1. Motivated by the similarity of this system to those found in low mass, we have modeled the emission of the disk using the models developed by D'Alessio et al. 2006 for low mass stars. The main objective is to investigate whether the assumptions that are valid for disks around low-mass stars could be extrapolated to the case of massive stars. As a result we have found a very massive disk of about ~5 Msun which represents around 25 % of the stellar mass. This mass is consistent with the calculated dynamic mass. The disk has a radius of ~170 au with a 49o of inclination. We have compared the temperature and density structure obtained with our model with potential functions and show that the GGD~27--MM1 system is a potential template for future similar studies in other high-mass protostars. Specifically, we have found a flared disk with a maximum scale height of ~13 au and a temperature profile that goes from ~150 K on the outside of the disk to ~ 1400 K on the inner edge of the disk. Analysis of the Toomre parameter Q evaluated at the midplane temperature of the disk indicates that the disk is stable up to a radius 100 au. This work shows that D'Alessio's models can be used as a first approximation and also obtain various observational predictions.
Author : Manuel Antonio Merello Ferrada
Publisher :
ISBN 13 :
Total Pages : 460 pages
Book Rating : 4.:/5 (893 download)
Download or read book Study of Galactic Clumps with Millimeter written by Manuel Antonio Merello Ferrada and published by . This book was released on 2014 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Massive stars play a key role in the evolution of the Galaxy; hence they are important objects of study in astrophysics. Although they are rare compared to low mass stars, they are the principal source of heavy elements and UV radiation, affecting the process of formation of stars and planets, and the physical, chemical, and morphological structure of galaxies. Star clusters form in dense "clumps" (~few parsecs in size) within giant molecular clouds, while individual stars form in cores (subparsec scale). An important step in the observational study of massive star formation is the identification and characterization of clumps. More detailed studies can then show how these clumps fragment into cores. Studies of clumps in our Galaxy will provide fundamental guidelines for the analysis of other galaxies, where individual clumps and cores cannot be resolved, and provide a catalog of interesting sources for observations of the Milky Way with a new generation of instruments, such as the Atacama Large Millimeter/Submillimeter Array. Large-scale blind surveys of the Galactic plane at millimeter and submillimeter wavelengths have recently been completed, allowing us to identify star forming clumps and improve our understanding of the early stages of massive stars. One of these studies, the Bolocam Galactic Plane Survey (BGPS), mapped the continuum emission at 1.1 mm over a large region of the northern Galactic plane at a resolution of 33'', identifying 8559 compact sources throughout the Galaxy. In this dissertation, I present observations of a sample of sources from the BGPS catalog, obtained with the Submillimeter High Angular Resolution Camera II (SHARC-II). I present in this work 107 continuum emission maps at 350 microns at high angular resolution (8.5'') toward clump-like sources and construct a catalog of BGPS substructures. I estimate clump properties such as temperatures and multiplicity of substructures, and compare my results with 350 microns continuum maps from the Hi-GAL survey. I also present a detailed analysis, using molecular line and dust continuum observations, of the region G331.5-0.1, one of the most luminous regions of massive star formation in the Milky Way, located at the tangent region of the Norma spiral arm. Molecular line and millimeter continuum emission maps reveal the presence of six compact and luminous molecular clumps, with physical properties consistent with values found toward other massive star forming sources. This work includes the discovery of one of the most energetic and luminous molecular outflows known in the Galaxy, G331.512-0.103. For this high-speed outflow, I present ALMA observations that reveal a very compact, extremely young bipolar outflow and a more symmetric outflowing shocked shell surrounding a very small region of ionized gas. The source is one of the youngest examples of massive molecular outflows associated with the formation of a high-mass star.
Author : Ke Wang
Publisher : Springer
ISBN 13 : 3662449692
Total Pages : 160 pages
Book Rating : 4.6/5 (624 download)
Download or read book The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds written by Ke Wang and published by Springer. This book was released on 2014-11-03 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an in-depth, high-resolution observational study on the very beginning of the formation process: the fragmentation of dense molecular clouds known as infrared dark clouds (IRDCs). Using the Submillimeter Array (SMA) and Very Large Array (VLA) radio interferometers, the author has discovered a common picture of hierarchical fragmentation that challenges some of the leading theoretical models and suggests a new, observation-driven understanding of how massive star formation in clustered environments may begin: it is initiated by the hierarchical fragmentation of a dense filament from 10 pc down to 0.01 pc, and the stellar mass buildup is simultaneously fed by hierarchical accretion at similar scales. The new scenario points out the importance of turbulence and filamentary structure, which are now receiving increasing attention and further tests from both observers and theorists.
Author : Douglas Wood (Owen Starkey)
Publisher :
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.:/5 (89 download)
Download or read book Ultracompact H II Regions Associated with Massive Star Formation written by Douglas Wood (Owen Starkey) and published by . This book was released on 1988 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Norbert S. Schulz
Publisher : Springer Science & Business Media
ISBN 13 : 3642239269
Total Pages : 530 pages
Book Rating : 4.6/5 (422 download)
Download or read book The Formation and Early Evolution of Stars written by Norbert S. Schulz and published by Springer Science & Business Media. This book was released on 2012-05-24 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starburst regions in nearby and distant galaxies have a profound impact on our understanding of the early universe. This new, substantially updated and extended edition of Norbert Schulz’s unique book "From Dust to Stars" describes complex physical processes involved in the creation and early evolution of stars. It illustrates how these processes reveal themselves from radio wavelengths to high energy X-rays and gamma–rays, with special reference towards high energy signatures. Several sections devoted to key analysis techniques demonstrate how modern research in this field is pursued and new chapters are introduced on massive star formation, proto-planetary disks and observations of young exoplanets. Recent advances and contemporary research on the theory of star formation are explained, as are new observations, specifically from the three great observatories of the Spitzer Space Telescope, the Hubble Space Telescope and the Chandra X-Ray Observatory which all now operate at the same time and make high resolution space based observing in its prime. As indicated by the new title two new chapters have been included on proto-planetary disks and young exoplanets. Many more colour images illustrate attractive old and new topics that have evolved in recent years. The author gives updates in theory, fragmentation, dust, and circumstellar disks and emphasizes and strengthens the targeting of graduate students and young researchers, focusing more on computational approaches in this edition.
Author : Elena Puga
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Download or read book Early Stages of Massive Star Formation at High Spatial Resolution written by Elena Puga and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ilaria Pascucci
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (249 download)
Download or read book Massive Star Formation at High Spatial Resolution written by Ilaria Pascucci and published by . This book was released on 2004 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : International Astronomical Union. Symposium
Publisher : Cambridge University Press
ISBN 13 : 9780521856089
Total Pages : 552 pages
Book Rating : 4.8/5 (56 download)
Download or read book Scientific Requirements for Extremely Large Telescopes (IAU S232) written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2006-06-15 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings volume for researchers and graduate students of astronomy, covering the most exciting science and key ELT projects.
Author : Elena Puga Antolín
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (179 download)
Download or read book Early Stages of Massive Star Formation at High Spatial Resolution written by Elena Puga Antolín and published by . This book was released on 2004 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven Stahler
Publisher : Springer
ISBN 13 : 3319228013
Total Pages : 205 pages
Book Rating : 4.3/5 (192 download)
Download or read book The Birth of Star Clusters written by Steven Stahler and published by Springer. This book was released on 2017-11-04 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: All stars are born in groups. The origin of these groups has long been a key question in astronomy, one that interests researchers in star formation, the interstellar medium, and cosmology. This volume summarizes current progress in the field, and includes contributions from both theorists and observers. Star clusters appear with a wide range of properties, and are born in a variety of physical conditions. Yet the key question remains: How do diffuse clouds of gas condense into the collections of luminous objects we call stars? This book will benefit graduate students, newcomers to the field, and also experienced scientists seeking a convenient reference.
