Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download A Spatially Resolved Kinematic Study Of High Redshift Star Forming Galaxies PDF full book. Access full book title A Spatially Resolved Kinematic Study Of High Redshift Star Forming Galaxies.
| Author | : Shelley Adams Wright |
| Publisher | : |
| Total Pages | : 324 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
| Author | : David R. Law |
| Publisher | : Universal-Publishers |
| Total Pages | : 252 |
| Release | : 2008-09 |
| Genre | : Science |
| ISBN | : 1599426919 |
We study the spatially resolved properties of star-forming galaxies at redshift z 2 - 3 on scales 1 kpc using a combination of morphological and kinematic analyses in an effort to characterize the major mechanisms of galaxy formation in the young universe. Using a sample of 216 galaxies which have been spectroscopically confirmed to lie between redshifts z = 1.8 - 3.4 in the GOODS-N field we demonstrate that rest-UV morphology (as seen by the Hubble Space Telescope) is statistically uncorrelated with physical properties such as star formation rate and is therefore unable to support the hypothesis that the prevalence of irregular morphologies indicates a high major merger fraction. Further, we present a sample of 13 galaxies observed with the OSIRIS integral field spectrograph and the Keck laser-guide star adaptive optics system which demonstrate the prevalence of high velocity dispersions 80 km/s and generally little in the way of spatially resolved velocity gradients, inconsistent with favored rotating disk models. We discuss the implications of these results for galaxy formation models, including gas accretion via cold flows and gravitational instability of early gas-rich galactic disks. There is some evidence for a trend towards stronger rotational signatures in galaxies with more massive stellar populations.
| Author | : Dawn Erb |
| Publisher | : Universal-Publishers |
| Total Pages | : 168 |
| Release | : 2005 |
| Genre | : Science |
| ISBN | : 1581122977 |
We study the properties of star-forming galaxies at redshift z 2, an era in which a substantial fraction of the stellar mass in the universe formed. Using 114 near-IR spectra of the H-alpha and [N II] emission lines and model spectral energy distributions fit to rest-frame UV through IR photometry, we examine the galaxies' star formation properties, dynamical masses and velocity dispersions, spatially resolved kinematics, outflow properties, and metallicities as a function of stellar mass and age. While the stellar masses of the galaxies in our sample vary by a factor of 500, dynamical masses from H-alpha velocity dispersions and indirect estimates of gas masses imply that the variation of stellar mass is due as much to the evolution of the stellar population and the conversion of gas into stars as to intrinsic differences in the total masses of the galaxies. About 10% of the galaxies are apparently young starbursts with high gas fractions, caught just as they have begun to convert large amounts of gas into stars. Using the [N II]/H-alpha ratio of composite spectra to estimate the average oxygen abundance, we find a monotonic increase in metallicity with stellar mass. From the estimated gas fractions, we conclude that the observed mass-metallicity relation is primarily driven by the increase in metallicity as gas is converted to stars. The picture that emerges is of galaxies with a broad range in stellar population properties, from young galaxies with ages of a few tens of Myr, stellar masses M 10 DEGREES9 Msun, and metallicities Z 1/3 Zsun, to massive objects with M* 10 DEGREES11 Msun, Z Zsun, and ages as old as the universe allows. All, however, are rapidly star-forming, power galactic-scale outflows, and have masses in gas and stars of at least 10 DEGREES10 Msun, in keeping with their likely role as the progenitors of elliptical galaxies
| Author | : Mairéad Hurley |
| Publisher | : |
| Total Pages | : 174 |
| Release | : 2011 |
| Genre | : |
| ISBN | : |
| Author | : Nimisha Kumari |
| Publisher | : |
| Total Pages | : |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
| 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 | : 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 | : Santiago Erroz-Ferrer |
| Publisher | : Springer |
| Total Pages | : 207 |
| Release | : 2015-11-21 |
| Genre | : Science |
| ISBN | : 3319263986 |
This thesis discusses the evolution of galaxies through the study of the morphology, kinematics, and star formation properties of a sample of nearby galaxies. The main body of the thesis describes the kinematic observations with the GHaFAS Fabry-Perot instrument on the William Herschel Telescope of a sample of 29 spiral galaxies. The work is closely related to the Spitzer Survey of Stellar Structure in Galaxies, and uses the mid-infrared data of that survey to determine key parameters of the galaxies studied. From these data, important results are obtained on streaming and other non-circular motions in galaxies, on the distribution and rates of star formation, and on how correlations of these parameters and of the rotation curve shape with basic galaxy parameters yield clues on the evolutionary processes taking place in disk galaxies.
| Author | : Alejandro Crespo Gómez |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2022 |
| Genre | : |
| ISBN | : |
Since their discovery, Luminous and Ultraluminous Infrared Galaxies (U/LIRGs) have been the subject of numerous studies due to their characteristically intense star formation rate (SFR). These objects are the perfect laboratory to study in detail the physical and dynamical processes that govern the creation of stars from gas reservoirs and are therefore critical for the evolution of galaxies. Furthermore, although these galaxies are not common in the local Universe, they are the dominant population to the energy density at z>1. Understanding the behaviour of gas and stars in these objects is therefore critical to our knowledge of what the Universe was like more than 8 billion years ago. Gas kinematic studies in these objects have revealed that their behaviour encompasses a wide range of dynamical states, from those dominated by the rotating-disc motions to much more complex ones driven by gravitational interaction processes. It is also worth noting that the intense starbursts and the presence of active galactic nuclei (AGN) in these objects yields a scenario where the presence of gas ejections, in any of their phases, is not uncommon. In this scenario, the stellar component is really relevant, since stars area better tracer of the gravitational potential as they are less reactive to local events that may perturb their kinematics. However, the stellar kinematics of these objects remains largely unknown, partly due to the difficulty of obtaining a signal-to-noise value (S/N) high enough to observe the stellar continuum, and has only been studied for a small number of objects, generally from the integrated and/or nuclear spectra...
| Author | : Donald E. Osterbrock |
| Publisher | : University Science Books |
| Total Pages | : 488 |
| Release | : 2006 |
| Genre | : Science |
| ISBN | : 9781891389344 |
Thoroughly revised and expanded throughout, the new edition is a graduate-level text and reference book on gaseous nebulae, nova and supernova remnants. Much of the new data and new images are from the Hubble Space Telescope with two wholly new chapters being added along with other new features. The previous edition which was tried and tested for thirty years has now been succeeded by a revised, updated, larger edition, which will be valuable to anyone seriously interested in astrophysics.
