Download or read book The Formation and Evolution of Galaxies microform a Deep Submillimeter Survey written by Tracy M. A. (Tracy Margaret Anne) Webb and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deep Millimeter Surveys Implications For Galaxy Formation And Evolution written by David H Hughes and published by World Scientific. This book was released on 2001-10-29 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: The arrival of large submillimeter and millimeter-wave detector arrays opened a new window on galaxy formation and evolution. The major new facilities now being designed or constructed, such as ALMA (MMA) and the Large Millimeter Telescope (LMT), will soon be expanding the horizons even farther.The Conference on “Deep Millimeter Surveys: Implications for Galaxy Formation and Evolution” drew together the major international groups working on submillimeter and millimeter-wave galaxies to discuss their relation to other galaxies both near by and in the early Universe, the role of the LMT and other new facilities in advancing the new field, and the implications of the new results and models for our understanding of galaxy formation and evolution. The resulting compendium of reports on observations, simulations, theory and interpretation, and instrumentation is the first book to present the new millimeter view of the early Universe thoroughly in a single volume.
Download or read book Probing Global Star and Galaxy Formation Using Deep Multi wavelength Surveys written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Electronic reproduction.
Download or read book Galaxy Formation and Evolution from Deep Optical and Infrared Surveys written by Nathan Adams and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Galaxy Evolution from Deep Optical and Near infrared Surveys written by Leonidas Alexander Moustakas and published by . This book was released on 1998 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probing Galaxy Evolution Through Deep Radio Continuum Observations written by Hansung Gim and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important questions in modern astrophysics is how galaxies form and evolve. There are numerous processes involved in galaxy evolution, but the stellar mass buildup and supermassive black hole growth are two main drivers in galaxy evolution. Those activities are heavily obscured by dust, so we need another tracer without dust attenuation: low-frequency radio continuum observation. We understand the galaxy evolution through the deep radio continuum observations on the Great Observatories Origins Deep Survey (GOODS)-North, -South, and the COSMOS HI Large Extragalactic Survey (CHILES) fields. Exploiting the multi-wavelength dataset, we define the radio populations such as star-formation (SF) dominated, active galactic nuclei (AGN)-dominated, and passive galaxies by applying new selection criteria. Populations are defined according to the relative contributions of SF and AGN luminosities to the bolometric luminosities of host galaxies and star formation properties. We explore the physical properties of radio populations, interpret their properties in the context of galaxy evolution, and show that our results of radio populations are consistent with the galaxy evolution scenarios. These results are the same for the GOODS and CHILES fields. Our investigation of the radio spectral index and radio-FIR correlation for the GOODS fields show that the radio spectral index is characteristic of each population and the radio-FIR correlation is a robust tracer of star formation activity. The analysis of radio spectral index shows the prominence of steep spectrum sources at faint flux density first as expected in the Euclidean normalized number counts. We also show that the radio spectral index should be calculated by matching the beam sizes of images. The evolution of the radio-FIR correlation in SF-dominated galaxies is not found significantly with our data. On the other hand, the analysis of radio spectral index for the CHILES is not consistent with the result of the GOODS due to the larger difference of beam area. This inconsistency gives important implications for the future works.
Download or read book Star Formation and Galaxy Evolution Since Z 2 written by Drew Grinnell Brisbin and published by . This book was released on 2014 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Formation and Evolution of Isolated Galaxies written by Daniel Joseph Pisano and published by . This book was released on 2001 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Galaxy Formation and Evolution written by Rychard John Bouwens and published by . This book was released on 1999 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Millimeter and Submillimeter Studies on the Active Trinity of Gas Stars and Black Holes in Seyfert Galaxies written by Takuma Izumi and published by Springer. This book was released on 2018-01-23 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on understanding the growth and formation mechanism of supermassive black holes (SMBHs), an issue it addresses by investigating the dense interstellar medium that is assumed to be a crucial component of the fuel for SMBHs. The thesis also offers unique guidance on using the Atacama Large Millimeter/submillimeter Array (ALMA) in active galactic nuclei (AGN) research. The author presents the three major findings regarding SMBH formation and growth: (1) The development of a new diagnostic method for the energy sources in galaxies based on submillimeter spectroscopy, which allows identification of accreting SMBHs even in obscured environments, (2) the discovery that the circumnuclear dense gas disk (CND), with a typical size of a few tens of parsecs, which plays a crucial role in governing the growth of SMBHs, and (3) the discovery that the mass transfer budget from the CND to the central SMBHs can be quantitatively understood with a theoretical model incorporating the circumnuclear starburst as a driver of mass transfer. The thesis skillfully reviews these three findings, which have greatly improved our understanding of the growth mechanism of SMBHs.
Download or read book Galaxy Evolution as Seen by Herschel written by Zhiyuan Ma (Ph.D. in Physics) and published by . This book was released on 2018 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unprecedented Herschel data have revolutionized our view of the IR universe, providing new insights to galaxy formation and evolution. However, the Herschel data are still far away from being fully explored, mainly due to three reasons. First, in most of the Herschel wide fields, we are still lacking ancillary data even in the optical/near-IR, which prevents us from doing any follow-up analysis. Second, even in the few fields that have sufficient ancillary data in various archives, there is no homogeneous reduction such that the data can be readily used. Third, but not the least, the long-standing problem of poor spatial resolution in FIR/sub-mm observations severely limits our capability of counterpart identification, and hence creates tremendous obstacles in obtaining redshifts, modeling the spectral energy distributions, deriving star formation rates, etc. In this thesis, I present our approach to attack these problems. My basic task is to establish a methodology that can be applied to all the Herschel wide-field survey data, with the science goal of constructing the largest, well-defined sample of highredshift Ultra-Luminous InfarRed Galaxies (ULIRGs) whose optical-to-far-IR SEDs are accurately measured. We first conduct a comprehensive search of the available archival optical data in the public domain. Moreover, we have been conducting our own deep optical survey, Mizzou WIYN Survey, to observe those fields that lack full range optical data coverage. To facilitate the data reduction process, I have developed APUS, a pipeline building and management tool that offers great repeatability, scalability, and maintainability. With this tool, we can reduce all these data in a uniform manner and create deep optical mosaics. To combat the problem of poor spatial resolution in the Herschel data, we have developed a source de-blending algorithm, which I have implemented as a software tool called CIDer. Using this tool, we can extract the major contributors to the FIR fluxes based on the position priors from the high-resolution optical data. Treating all the Herschel wide-field data is obviously beyond the scope of an individual thesis. Therefore, my thesis mainly focuses on one field, namely the "First Look Survey" field. As the first study case, we compiled and reduced the full-range multi-wavelength data in this field, and constructed the panchromatic SEDs from optical to FIR using CIDer. The redshifts of the sources were found to be ranging from z = 0 to ~ 3. We derived the total IR luminosities by fitting modified black body model or starbursting templates, which are found to be ranges from 3 x 10[superscript 10] to ~ 10[superscript 13] L[SYMBOL]_ after taking into account the cut to ensure reliability of the CIDer result. On the L[subscript IR]-T plane, the sources show the similar turning over behavior as in our previous study Yan & Ma (2016), implies a limited size of the dust star forming sites. Also presented in the thesis is our earlier work on the Herschel-detected SDSS quasars. The project was conducted before we have the CIDer to obtain the fullrange SEDs and thereby the redshifts. Instead, we aimed at the quasars, which we can measure the redshift spectroscopically and to a high redshift. In the project, it is found that the Herschel-detected quasars are mostly ULIRGs, and are forming stars very actively. This implies the co-evolution of extreme AGNs and star formation.
Download or read book Probing Global Star and Galaxy Formation Using Deep Multi wavelength Surveys written by Peter L. Capak and published by . This book was released on 2004 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Star formation History of Massive Galaxies written by Anita M. Schael and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents multi-frequency data, galaxy identifications, estimated redshifts, and derived physical properties for the sub-millimetre source sample produced by the SCUBA HAlf Degree Extragalactic Survey (SHADES). SHADES is the largest, complete, sub-millimetre survey undertaken to date, and the aim of this work is to exploit this survey to study the evolution of sub-mm selected galaxies at high redshift, explore their possible connectionwith localmassive ellipticals, and to test current models of galaxy formation. The SHADES sample was selected from 850 micron images made with the submillimetre camera SCUBA at the James Clerk Maxwell Telescope. These submillimetre maps cover a total area of 720 arcmin2 split between two well-studied extra-galactic survey fields, the Lockman Hole East and the Subaru/XMMNewton Deep Field (SXDF). The resulting sample of 120 sub-millimetre sources is the focus of this thesis. Here the wealth of information provided by deep radio, optical, near-infrared and mid-infrared imaging of the two SHADES fields is exploited to complete the identification of the SHADES sample, and then to derive a robust redshift estimate for every sub-millimetre source. Where possible this is achieved from the optical+ infrared photometry using a new two-component redshift estimation code developed specifically to deal with starbursting galaxies with potentially highly stochastic star-formation histories. The effectiveness of this code is demonstrated via comparison with the small subset of SHADES source which possess robust spectroscopic redshifts. For those galaxies which are too faint for effective redshift constraints to be provided by the existing optical+infrared photometry, the information on the long-wavelength spectral energy distribution provided by the radio+submm photometry is utilised to provide cruder constraints or limits on redshift. The result is the first complete and unbiased estimate of the redshift distribution of the bright extragalactic sub-millimetre galaxy population. It is found that the brightest sub-mm sources are confined to the redshift range 2
Download or read book The Formation and Evolution of Galaxies written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Formation and Evolution of Galaxies and Large Structures in the Universe written by J. Audouze and published by Springer. This book was released on 2011-11-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, La Plagne, France, March, 1983
Download or read book The Evolution of Galaxies and AGN from Deep X ray and Optical Surveys written by and published by . This book was released on 2004 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Looking Wider and Further written by and published by . This book was released on 2016 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxy clusters are rare objects in the universe, but on-going wide field optical surveys are identifying many thousands of them to redshift 1.0 and beyond. Using early data from the Dark Energy Survey (DES) and publicly released data from the Sloan Digital Sky Survey (SDSS), this dissertation explores the evolution of cluster galaxies in the redshift range from 0 to 1.0. As it is common for deep wide field sky surveys like DES to struggle with galaxy detection efficiency at cluster core, the first component of this dissertation describes an efficient package that helps resolving the issue. The second part focuses on the formation of cluster galaxies. The study quantifies the growth of cluster bright central galaxies (BCGs), and argues for the importance of merging and intra-cluster light production during BCG evolution. An analysis of cluster red sequence galaxy luminosity function is also performed, demonstrating that the abundance of these galaxies is mildly dependent on cluster mass and redshift. The last component of the dissertation characterizes the properties of galaxy filaments to help understanding cluster environments.
