Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Nature And Evolution Of High Redshift Dusty Star Forming Galaxies PDF full book. Access full book title The Nature And Evolution Of High Redshift Dusty Star Forming Galaxies.
| Author | : Joshua Greenslade |
| Publisher | : |
| Total Pages | : |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
| Author | : William Cowley |
| Publisher | : Springer |
| Total Pages | : 221 |
| Release | : 2017-10-02 |
| Genre | : Science |
| ISBN | : 3319667483 |
This thesis combines a theoretical model of galaxy formation with a treatment of the radiative transfer in the titular dusty star-forming galaxies. Embedding this within the well-established ΛCDM (Lambda cold dark matter) cosmology, the author was able to simulate galaxy populations from which realistic observational images were synthesised. Based on further analysis, he shows that there is a good correspondence with observations from new instruments such as the SCUBA2 bolometric camera and the Atacama Large Millimeter Array (ALMA) interferometer, and reveals some novel aspects of this exciting galaxy population. In particular, he shows that blending of these galaxies in the imaging produces an artificial enhancement in their clustering, which he dubs “blending bias”. This implies that the host dark matter halo masses for these galaxies have previously been significantly overestimated. He also presents amongst the first predictions from a galaxy formation model for observations of these galaxies that will be made by the James Webb Space Telescope (the successor to the Hubble Space Telescope).
| Author | : I. Pérez-Fournon |
| Publisher | : Cambridge University Press |
| Total Pages | : 302 |
| Release | : 2003-03-20 |
| Genre | : Science |
| ISBN | : 9780521825917 |
This volume presents lectures of the XI Canary Islands Winter School of Astrophysics written by experts in the field.
| Author | : Space Telescope Science Institute (U.S.). Symposium |
| Publisher | : Cambridge University Press |
| Total Pages | : 328 |
| Release | : 1998-10-13 |
| Genre | : Science |
| ISBN | : 9780521630979 |
The Hubble Deep Field (HDF) is the deepest optical image of the Universe ever obtained. It is the result of a 150-orbit observing programme with the Hubble Space Telescope. It provides a unique resource for researchers studying the formation and evolution of stars and galaxies. This timely volume provides the first comprehensive overview of the HDF and its scientific impact on our understanding in cosmology. It presents articles by a host of world experts who gathered together at an international conference at the Space Telescope Science Institute. The contributions combine observations of the HDF at a variety of wavelengths with the latest theoretical progress in our understanding of the cosmic history of star and galaxy formation. The HDF is set to revolutionize our understanding in cosmology. This book therefore provides an indispensable reference for all graduate students and researchers in observational or theoretical cosmology.
| Author | : Caitlin M. Casey |
| Publisher | : |
| Total Pages | : 118 |
| Release | : 2014 |
| Genre | : |
| ISBN | : |
| Author | : Immo Appenzeller |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 353 |
| Release | : 2009-06-17 |
| Genre | : Science |
| ISBN | : 3540758240 |
The high-redshift galaxies became a distinct research ?eld during the ?nal decade of the20thcentury. AtthattimetheLyman-breaktechniquemadeitpossibletoidentify signi?cant samples of such objects, and the new generation of 8 to 10-m telescopes resulted in ?rst good spectroscopic data. Today the high-redshift galaxies have developed into one of the important topics of astrophysics, accounting for about 5–10% of the publications in the major scienti?c journals devoted to astronomy. Because high-redshift galaxies is a rapidly developing ?eld and since new results are published constantly, writing a book on this topic is challenging. On the other hand, in view of the large amount of individual results now in the literature, and in view of the still growing interest in this topic, it appears worthwhile to summarize and evaluate the available data and to provide an introduction for those who wish to enter this ?eld, or who, for various reasons, might be interested in its results. The end of the ?rst decade of the 21st century appears to be a good point in time to attempt such a summary. The current generation of ground-based 8 to 10-m - optical telescopes, the Hubble Space Telescope, and the most important large radio telescopes have by now been in operation since about one or two decades. Although these instruments will continue to produce important scienti?c results for some time to come, many of the initial programs exploiting their unique new possibilities have been completed.
| Author | : Logan Houston Jones |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2021 |
| Genre | : |
| ISBN | : |
The creation of new stars from cold gas is one of the most fundamental astrophysical processes that can be observed in our own galaxy and in others. At a broad level, the modern phenomenological picture of how stars form is consistent with observations of systems ranging from nearby molecular clouds to the most distant galaxies. Many gaps and limitations in the details of such a picture, however, remain unfilled and unanswered. For example, questions remain about the interplay between star formation and chemical enrichment in blue, metal-poor galaxies and the impact of that relationship in cosmic reionization -- one of the final frontiers of observational extragalactic astrophysics. Meanwhile, on the other end of the electromagnetic and metallicity spectrum, there exists a population of high-redshift, far-infrared-bright, and heavily dust-obscured starbursting galaxies that represent a fleeting but possibly integral stage in the growth of massive galaxies and of dense, large-scale structures like (proto)clusters of galaxies. However, the mechanism(s) that trigger such starbursts, especially in dense environments, remains ambiguous. The research that comprises this dissertation aims to answer two questions that, while both relevant to astronomers' understanding of the birth and evolution of galaxies in the broadest sense, are largely disjoint from one another. These questions are: 1) What are the intermediate- to high-redshift analogs to the sources that reionized the universe at very early times?; and 2) As a function of redshift and/or environment, how common are massively star-forming, dust-obscured galaxies? Because these questions are so different from one another, this dissertation will be split into two major parts. In the first, I present a search in two legacy fields (the GOODS-North and the GOODS-South) for galaxies at high redshift that may be sources of ionizing ultraviolet photons. Such objects are expected to be analogs, in various ways, to the first generation of galaxies, and thus provide clues to the nature of very-high-redshift galaxies that will be discovered en masse by future ground- and space-based observatories. In the second part, I present the spectroscopic confirmation of an overdensity of dusty starbursting galaxies at $z \approx 3.14$, signposting a protocluster of galaxies near the peak of star formation activity in the universe. Compared to similar recent discoveries in the literature, this new protocluster is relatively late-forming and includes several of the most infrared-luminous starbursts currently known. This makes it an excellent laboratory for testing theories of starburst triggering and the subsequent buildup of stellar mass in dense environments. In the final chapter of this dissertation, I reiterate the key results of the research presented in chapters 2, 3, and 5.
| Author | : Drew Grinnell Brisbin |
| Publisher | : |
| Total Pages | : 167 |
| Release | : 2014 |
| Genre | : |
| ISBN | : |
Our recent studies in galaxy evolution have revealed a surprising new paradigm of star formation. Contrary to the notion that major mergers play an increasingly dominant role going backwards in cosmic history, we find that over the last ~10 Gyr, much of star formation has been fueled by accreting cold gas from the cosmic web. Accretion rates were presumably larger in the past, so star forming systems may have very different properties in the early Universe and today. Large scale astronomical surveys, such as the Herschel Multi-Tiered Extragalactic Survey (HerMES), and the Sloan Digital Sky Survey (SDSS) have provided a wealth of extragalactic data covering a statistically large number of sources. Targeted, niche surveys, like our fine structure line survey of star forming galaxies in the early Universe observed with the redshift (z) Early Universe Spectrometer (ZEUS) have provided detailed observations of high interest sources. We have made use of this diverse set of data to study galaxy evolution from the epoch of peak star formation at z=1-2 up to the present. Data from HerMES is a reliable probe of infrared emission, particularly useful for characterizing the far infrared dust peak, and therefore determining star formation rates out to redshifts of a few. Deep integrations with the Herschel SPIRE photometer rapidly reach the confusion limit, tempering its utility in studying faint high redshift galaxies. With appropriate care taken to identify blended sources, however, HerMES data is useful in identifying bright, red- shifted, star forming sources. We have compiled spectral energy distributions from HerMES and ancillary data and found that, even sources at high redshift are well fit by local star forming galaxy templates. In the local Universe, spectroscopic SDSS data has allowed us to estimate crucial galaxy properties on ~105 sources, providing an opportunity to observe general statistical trends, and constrain theories of galaxy evolution. A toy model of cold flow accretion powered star formation reproduces the observed fundamental plane of galaxy stellar mass, metallicity, and star formation for small and medium mass galaxies. Our fine structure line survey with ZEUS detected the [CII] 157.7 [MICRO SIGN]m line in eight galaxies from the epoch of peak star formation at z=1-2. We augmented this survey with observations of the [OI] 63 [MICRO SIGN]m line and far infrared photometry from Herschel, as well as Spitzer IRS spectra from the literature. Most of our sources have higher than average gas heating efficiency with L[CII] /LF IR 10[-]2 . We interpret the majority of them as being dominated by star formation powered PDRs, extending to kpc scales. In two sources there is evidence for enhanced [CII] emission due to heating by low velocity shocks. These findings are consistent with a picture of gas accretion fueling star formation on a near galaxy-wide scale. In synthesizing this data we find a remarkable consistency in the nature of star formation over the last 10 Gyr. In contrast with the model of sustained hierarchical merging, we find that star formation since z~2 is fueled largely by cold flow accretion of gas from the cosmic web, which presents itself as moderate density star formation with correspondingly moderate UV fields.
| Author | : S. D'Odorico |
| Publisher | : |
| Total Pages | : 592 |
| Release | : 1998 |
| Genre | : Science |
| ISBN | : |
| Author | : Maren Cosens |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2022 |
| Genre | : |
| ISBN | : |
Star formation is key to the regulation of galactic environments. Studying the sites of ongoing star formation is therefore critical to understanding the evolution of galaxies over cosmic time. Integral Field Spectrographs (IFS) have allowed astronomers to probe the dynamical processes of galaxies at high redshift, z∼1-3, revealing unique kiloparsec-scale "clumps" of star formation. The relationships between clump size, luminosity, and velocity dispersion are particularly important to understanding clump formation and evolution. These relationships have been measured in a variety of studies but disagreement remains about their nature and possible evolution with redshift. To investigate the cause of these differences, I collected a comprehensive sample of clump observations across redshifts and developed a Bayesian Markov Chain Monte Carlo fitting routine to robustly explore the scaling relationships of star-forming regions. There is evidence of a break into two clump populations based on their star formation rate surface density with differences in slope due to either the formation mode or geometry of the clump and host galaxy disk, but there is added uncertainty from limited observations at small clump sizes. To address this limitation, I observed a sample of compact H II regions in the local starburst galaxy, IC 10, with the Keck Cosmic Web Imager IFS at the W. M. Keck Observatory. I found these H II regions are offset to higher luminosity and velocity dispersion for a given size. These H II regions do not appear to be virialized, and instead show evidence that they are young and expanding. Even in the most compact H II regions, warm gas pressure from photoinization heating provides the dominant contribution to outward pressure and expansion. Improvements in instrumentation are also key to improving studies of the characteristics and evolution of star-forming regions, as well as many other astronomical objects. Liger, an adaptive optics fed IFS and imager for Keck Observatory, will provide improvements in resolution, field of view, and wavelength coverage compared to current instruments. I have developed the mechanical design of three major components of the Liger imager and sequential spectrograph: the filter wheel; selectable cold pupil stop; and mounting stage for the imager detector and IFS pick-off mirrors.
