Download or read book The Earliest Stages of Massive Clustered Star Formation written by Ke Wang and published by . This book was released on 2014-11-30 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Stages of Clustered Star Formation written by Willem Freerk Frieswijk and published by . This book was released on 2008 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Hot Star Workshop III the Earliest Stages of Massive Star Birth written by Paul A. Crowther and published by . This book was released on 2002 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared and Radio Observations of the Earliest Stages of Massive Star Formation written by Jan Pitann and published by . This book was released on 2012 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Astrobiology written by Muriel Gargaud and published by Springer Nature. This book was released on 2023-07-27 with total page 3376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in its third edition the Encyclopedia of Astrobiology serves as the key to a common understanding in the extremely interdisciplinary community of astrobiologists. Each new or experienced researcher and graduate student in adjacent fields of astrobiology will appreciate this reference work in the quest to understand the big picture. The carefully selected group of active researchers contributing to this work are aiming to give a comprehensive international perspective on and to accelerate the interdisciplinary advance of astrobiology. The interdisciplinary field of astrobiology constitutes a joint arena where provocative discoveries are coalescing concerning, e.g. the prevalence of exoplanets, the diversity and hardiness of life, and its chances for emergence. Biologists, astrophysicists, (bio)-chemists, geoscientists and space scientists share this exciting mission of revealing the origin and commonality of life in the Universe. With its overview articles and its definitions the Encyclopedia of Astrobiology not only provides a common language and understanding for the members of the different disciplines but also serves for educating a new generation of young astrobiologists who are no longer separated by the jargon of individual scientific disciplines. This new edition offers ~170 new entries. More than half of the existing entries were updated, expanded or supplemented with figures supporting the understanding of the text. Especially in the fields of astrochemistry and terrestrial extremophiles but also in exoplanets and space sciences in general there is a huge body of new results that have been taken into account in this new edition. Because the entries in the Encyclopedia are in alphabetical order without regard for scientific field, this edition includes a section “Astrobiology by Discipline” which lists the entries by scientific field and subfield. This should be particularly helpful to those enquiring about astrobiology, as it illustrates the broad and detailed nature of the field.
Download or read book A Submillimetre Study of Massive Star Formation Within the W51 Complex and Infrared Dark Clouds written by Harriet Alice Louise Parsons and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Star Formation Activity in Cores Within Infrared Dark Clouds written by Edward T. Chambers and published by . This book was released on 2010 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Massive Star forming Regions Across the Galaxy written by Kazi Lucie Jessica Rygl and published by . This book was released on 2010 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Peering Into the Heart of Galactic Star Formation written by Sarah E. Ragan and published by . This book was released on 2009 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book From Infrared Dark Clouds to Massive Young Stars written by Gözde Saral and published by . This book was released on 2017 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotopic fractionation study towards massive star forming regions across the Galaxy written by Laura Colzi and published by Firenze University Press. This book was released on 2022 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important tools to investigate the chemical history of our Galaxy and our own Solar System is to measure the isotopic fractionation of chemical elements. In the present study new astronomical observations devoted to the study of hydrogen and nitrogen fractionation (D/H and 14N/15N ratios) of molecules, towards massive star-forming regions in different evolutionary phases, have been presented. Moreover, a new detailed theoretical study of carbon fractionation, 12C/13C ratios, has been done. One of the main results was the confirmation that the 14N/15N ratio increases with the galactocentric distance, as predicted by stellar nucleosynthesis Galactic chemical evolution models. This work gives new important inputs on the understanding of local chemical processes that favor the production of molecules with different isotopes in star-forming regions.
Download or read book Molecular Line Observations of Infrared Dark Clouds in the Galaxy written by Susanna C. Finn and published by . This book was released on 2012 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Although massive stars play many important roles in the universe, their formation is poorly understood. Recently, a class of interstellar clouds known as Infrared Dark Clouds (IRDCs) has been identified as likely progenitors of massive stars and clusters. These clouds are dense (n H 2 > 105 cm-3 ), cold (T
Download or read book Astrophysical Masers IAU S336 written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2018-09-13 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes state of the art observations and theories pertaining to astrophysical masers and their environments, for graduate students and researchers.
Download or read book The Physics of Star Formation and Early Stellar Evolution written by Charles J. Lada and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 779 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of stars is one of the principle mysteries of nature. During the last two decades advances in technology have enabled more progress to be made in the quest to understand stellar origins than at any other time in history. The study of star formation has developed into one of the most important branches of mod ern astrophysical research. A large body of observational data and a considerable literat ure now exist concerning this topic and a 1arge community of international astronomers and physicists devote their efforts attempting to decipher the secrets of stellar birth. Yet, the young astronomerjphysicist or more advanced researcher desiring to obtain a basic background in this area of research must sift through a very diverse and sometimes bewildering literature. A literature which includes research in many discip1ines and sub discip1ines of classical astrophysics from stel lar structure to the interstellar medium and encompasses the entire range of the electromagnetic spectrum from radio to gamma rays. Often, the reward of a suc cessfu1 foray through the current literature is the realization that the results can be obsolete and outdated as soon as the ink is dry in the journal or the conference proceeding in which they are published.
Download or read book Infrared Dark Clouds and Star Formation written by Matias Andres Lackington Werner and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical and Chemical Processes in Cloud Cloud Collisions written by Giuliana Cosentino and published by . This book was released on 2019 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nfrared Dark Clouds (IRDCs) are cold and dense regions in space, considered as the birthplace of high-mass stars and stellar clusters. Recent studies support the idea that the physical mechanisms leading to the formation of these IRDCs may also trigger high-mass star formation within the clouds. Footprints of such formation mechanisms may be stored in the molecular gas kinematics and chemical content of IRDCs. Hence, it is crucial to investigate IRDCs to search for signatures of their formation process. In this thesis, we analyse the spatial extent and kinematic structure of the shock tracer Silicon Monoxide (SiO) to identify signatures of one particular IRDCs formation scenario, cloud-cloud collisions, toward the nine IRDCs G018.82−00.28, G019.27+00.07, G028.37+00.07, G028.53−00.25, G028.67+00.13,G034.43+00.24,G034.77−00.55,G038.95−00.47, G053.11+00.05, at different evolutionary stages. Among the IRDCs, the extended SiO emission de- tected toward G034.77−00.55 probes the MHD shock wave associated with the collision between the cloud and a flow of molecular gas pushed toward the IRDC by the nearby supernova remnant W44. The shocked gas traces the internal time- dependent structure of the MHD shock, here directly observed for the first time. Toward the IRDCs G018.82−00.28 and G038.95−00.47, the widespread SiO emis- sion may be partially due to on-going star formation activity and partially associated with the interaction between the clouds and nearby galactic bubbles. The SiO emission detected toward IRDCs G019.27+00.07, G028.37+00.07, G028.53−00.25, G034.43+00.24 and G053.11+00.05, known to be actively forming stars, is likely associated with on-going star formation activity. Finally, no significant SiO emission is found toward the IRDC G028.67+00.13. With our results, we suggest that cloud-cloud collisions triggered by stellar feedback may represent a good laboratory to investigate massive star formation in its early stages, although they likely do not represent the main formation mechanism of massive stars.
