Download or read book The Influence of Galaxy Interactions on Nuclear Activity written by Roc M. Cutri and published by . This book was released on 1986 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Influence of Galaxy Interactions on Nuclear Activity written by Roc M. Cutri and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interactions of Galaxies and Their Nuclear Activity written by Oved Avi Dahari and published by . This book was released on 1984 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Galaxy Interactions at Low and High Redshift written by J.E. Barnes and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Influence of Nuclear Activity Onto the Morphology of Galaxies written by Arman Khalatyan and published by . This book was released on 2007 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Paired and Interacting Galaxies written by International Astronomical Union. Colloquium and published by . This book was released on 1990 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Galaxy Activity Interaction Connection 2 Radio Observations written by and published by . This book was released on 1993 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the second part of an ongoing investigation into the triggering of nuclear radio emission in inter acting galaxies, we present the results of a Very Large Array snapshot survey of southern interacting galaxies at 6 and 20 cm. The purpose of the survey was to search for and classify the nature of radio emission in a set of advanced-interaction disk galaxies which we had previously imaged optically. There were 42 interacting systems in our sample as well as 10 control systems, none of which had been previously detected by the Parkes surveys. Maps of the radio emission are presented and discussed. The radio properties of the galaxies are compared with their optical and infrared properties to determine the nature of the radio emission. We find that the radio emission in all our interacting galaxies can be attributed to processes associated with a burst of star formation caused by the galaxy interaction. In a specific case (0558-33), we quantitatively confirm earlier models of a starburst, but using radio observations to estimate the number of supernova remnants rather than optical spectra and broadband observations. In no case did we find clear evidence for a buried active nucleus. Further high resolution observations are needed however to better assess the contribution from any compact, weak active nuclei. Despite the obvious interaction these galaxies have undergone, none have developed into powerful radio sources, even though many of the most powerful radio sources are themselves the likely products of galaxy-galaxy interactions. We briefly discuss the implications for the triggering of nuclear activity.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Link Between Tidal Interaction and Nuclear Activity in Galaxies written by D. N. C.. Lin and published by . This book was released on 1988 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Galaxy Interactions on Star Formation and AGN Activity at 0 5 written by Ekta Arjunkumar Shah and published by . This book was released on 2021 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Galaxy interactions and mergers play an important role in the hierarchical formation and evolution of galaxies. Studies in the nearby universe show a higher star formation rate (SFR) and active galactic nuclei (AGN) fraction in interacting and merging galaxies than in their isolated counterparts, indicating that such interactions are important contributors to star formation and black hole growth. A large fraction of massive galaxies is thought to be affected by galaxy mergers at high redshifts because the galaxy merger rate increases with redshift. We use deep observations and cosmological simulations to study the role of galaxy mergers and interactions in enhancing SFR and AGN activity in galaxies at $0.5 z 3.0$, covering the peak of cosmic star formation and AGN activity ($z\sim2$). For the observational study, we use deep CANDELS and COSMOS observations to compile the largest known sample of major spectroscopic galaxy pairs (2381 with $V

Download or read book NASA Conference Publication written by and published by . This book was released on 1990 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Nuclear Region Host Galaxy and Environment of Active Galaxies written by Erika Benítez and published by Instituto de Astronomia Universidad Nacional Autonoma de Mex. This book was released on 2008 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamics and Interactions of Galaxies written by Roland Wielen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress towards an understanding of the dynamics and interactions of galaxies has been spurred on more than ever by a wealth of new observations and numerical experiments. The Heidelberg Conference 1989, the papers of which are collected in this volume, was extremely successful in presenting a synoptic view of the field in all its aspects: galaxy interactions in the early universe and in recent times, interactions of our galaxy and its neighbours, dynamical problems of elliptical and disk galaxies, groups and clusters, starburst and nuclear activity triggered by interactions, merger scenarios, and numerical experiments. Researchers and graduate students, specialists or not, will find here a complete overview of a rapidly growing field of astronomy.

Download or read book Penetrating Bars through Masks of Cosmic Dust written by David L. Block and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: THE EDITORS: DAVID L. BLOCK AND KENNETH C. FREEMAN (SOC CO-CHAIRS), IVANIO PUERARI, ROBERT GROESS AND LIZ K. BLOCK 1. Harvard College Observatory, 1958 The past century has truly brought about an explosive period of growth and discovery for the physical sciences as a whole, and for astronomy in particular. Galaxy morphology has reached a renaissance . . The year: 1958. The date: October 1. The venue: Harvard College Observatory. The lecturer: Walter Baade. With amazing foresight, Baade penned these words: "Young stars, supergiants and so on, make a terrific splash - lots of light. The total mass of these can be very small compared to the total mass of the system". Dr Layzer then asked the key question: " . . . the discussion raises the point of what this classification would look like if you were to ignore completely all the Population I, and just focus attention on the Population II . . . " We stand on the shoulders of giants. The great observer E. E. Barnard, in his pioneering efforts to photograph the Milky Way, devoted the major part of his life to identifying and numbering dusty "holes" and dust lanes in our Milky Way. No one could have dreamt that the pervasiveness of these cosmic dust masks (not only in our Galaxy but also in galaxies at high redshift) is so great, that their "penetration" is truly one of the pioneering challenges from both space-borne telescopes and from the ground.

Download or read book Gas Flows and Star Formation as a Consequence of Galaxy Interaction in Compact Groups written by Frederic Paul Andre Vogt and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The environment of galaxies is known to influence their evolution via a wide range of processes, such as tidal interactions, ram-pressure stripping, or galaxy harassment. However, the exact interconnectivity between the large scale environment-driven mechanisms and the other internal processes (starburst, star formation quenching, nuclear activity, and both outflows and inflows) remains poorly understood. This thesis describes the use of the WiFeS and MUSE integral field spectrographs to study gas flows and star formation activity inside two members of compact groups of galaxies: HCG 16c and HCG 91c. In particular, WiFeS and MUSE are used to resolve scales of 1 kpc at the distances of HCG 16c and HCG 91c - the size of giant molecular clouds and HII regions - in an effort to tie the environment to its impact within the disks of the galaxies. HCG 16c is found to host an asymmetric, bipolar, rotating galactic wind, powered by a nuclear starburst. Emission line ratio diagnostics indicate that photoionization is the dominant excitation mechanism at the base of the wind. The asymmetry of the wind is likely caused by one of the two lobes of the wind-blown bubble bursting out of its HI envelope. The characteristics of the wind suggest that it is caught early (a few Myr) in the wind evolution sequence. The wind is also quite different to the galactic wind in the partner galaxy HCG 16d which contains a symmetric, shock-excited wind. Given that both galaxies have (likely) similar interaction histories, the different wind characteristics must be a consequence of the intrinsic properties of HCG 16c and HCG 16d. In HCG 91c, WiFeS and MUSE reveal HII regions with kinematic and abundance offsets in this otherwise unremarkable star-forming spiral. Specifically, at least three HII regions harbor an oxygen abundance 0:15 dex lower than expected from their immediate surroundings and from the overall abundance gradient present in the disk of this galaxy. The same star forming regions are also associated with a small kinematic offset in the form of a lag of 5-10kms1 with respect to the local circular rotation of the gas. HI observations of HCG 91 from the VLA and broadband optical images from Pan-STARRS suggest that HCG 91c is caught early in its interaction with the compact group HCG 91. Altogether, evidence point towards infalling and collapsing extra-planar halo gas clouds at the disk-halo interface of the galaxy. As such, HCG 91c provides evidence that some of the perturbations possibly associated with the early phase of galaxy evolution in compact groups impact the star forming disk locally, and on sub-kpc scales. Finally, this thesis also describes a series of new tools developed for the processing, analysis and visualization of these integral field spectroscopy datasets. These comprise a new data reduction pipeline for the WiFeS instrument, interactive PDF & HTML documents for multi-dimensional data visualization and publication, 3-D printing of astrophysical datasets, the pyqz code to derive oxygen abundances & ionization parameters from strong emission line ratios, and 3-D line ratio diagnostic diagrams.

Download or read book Galaxy Collisions written by Curtis Struck and published by Springer Science & Business Media. This book was released on 2011-02-04 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spectacular images of galaxy collisions capture the imagination. This book will show what is out there in the universe, what it’s like in other galaxies, what they might look like, and how cosmic processes might affect life in other solar systems. It will explain crucial stages in the development of physical structure in the universe, and the effect of galaxy scale processes. Professor Struck will explore all the issues surrounding galaxy collisions. He will begin with a brief broad review of the background on galaxies, the history of their discovery, and how this has been driven by steadily improving technology. Chapters 2 gives details of the early stages of different types of galaxy collision - Rings of Fire, Tidal Swings and Retrograde and Sideways Reels - while Chapter 3 describes collisions between galaxies of very different masses: minor merger or dwarf destruction. Chapter 4 covers ultra-luminous infrared galaxies and major mergers and Chapter 5 briefly examines the techniques used for computer simulation results and how increasing computer capacity has affected the development of this field. The following chapter looks at understanding the physical processes of triggered star formation and nuclear activity. Chapters 7-9 look at the broader view of cosmological structure growth which determines the environment and conditions in which galaxy collisions occur. In the densest environments, this process repeats itself on the larger scale of galaxy clusters. The concluding chapter considers what a galaxy collision looks like from a solar system like ours. Although the galaxy is completely restructured and the night sky view would change greatly over the course of several hundred million years, the direct effects on our planet would be few and infrequent, with only a small probability of being truly catastrophic. These issues will be explored along with the ideas that galaxies must reach a certain evolutionary "maturity" before they can even form solar systems, and that there are habitable zones within galaxies. Thus, galaxy scale processes, like collisions, can determine the fate of life on Earth-like planets.

Download or read book From the Realm of the Nebulae to Populations of Galaxies written by Mauro D'Onofrio and published by Springer. This book was released on 2016-07-26 with total page 809 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to outline possible future directions in galaxy research, this book wants to be a short stopover, a moment of self-reflection of the past century of achievements in this area. Since the pioneering years of galaxy research in the early 20th century, the research on galaxies has seen a relentless advance directly connected to the parallel exponential growth of new technologies. Through a series of interviews with distinguished astronomers the editors provide a snapshot of the achievements obtained in understanding galaxies. While many initial questions about their nature have been addressed, many are still open and require new efforts to achieve a solution. The discussions may reveal paradigms worthwhile revisiting. With the help of some of those scientists who have contributed to it, the editors sketch the history of this scientific journey and ask them for inspirations for future directions of galaxy research.