The Properties Of Star Forming Galaxies At Z 2
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The Properties Of Star Forming Galaxies At Z 2
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Author : Dawn Erb
language : en
Publisher: Universal-Publishers
Release Date : 2005
The Properties Of Star Forming Galaxies At Z 2 written by Dawn Erb and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Science categories.
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
A Multi Wavelength Census Of Star Formation At Redshift Z 2
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Author : Naveen Reddy
language : en
Publisher: Universal-Publishers
Release Date : 2006
A Multi Wavelength Census Of Star Formation At Redshift Z 2 written by Naveen Reddy and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
We examine the census of star-forming galaxies and their extinction properties at redshift z 2, when a large fraction of the stellar mass in the universe formed. We find a good agreement between the X-ray, radio, and de-reddened UV estimates of the average star formation rate (SFR) for our sample of z 2 galaxies of 50 Msun/yr, indicating that the locally calibrated SFR relations appear to be statistically valid from redshifts 1.5
The Kiloparsec Scale Structure And Kinematics Of High Redshift Star Forming Galaxies
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Author : David R. Law
language : en
Publisher: Universal-Publishers
Release Date : 2008-09
The Kiloparsec Scale Structure And Kinematics Of High Redshift Star Forming Galaxies written by David R. Law and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-09 with Science categories.
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.
Galaxies At High Redshift
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Author : I. Pérez-Fournon
language : en
Publisher: Cambridge University Press
Release Date : 2003-03-20
Galaxies At High Redshift written by I. Pérez-Fournon and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-03-20 with Science categories.
This volume presents lectures of the XI Canary Islands Winter School of Astrophysics written by experts in the field.
The Physics Of Galaxy Formation
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Author : Claudia Del P. Lagos
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-15
The Physics Of Galaxy Formation written by Claudia Del P. Lagos and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-15 with Science categories.
This thesis addresses two of the central processes which underpin the formation of galaxies: the formation of stars and the injection of energy into the interstellar medium from supernovae, called feedback. In her work Claudia Lagos has completely overhauled the treatment of these processes in simulations of galaxy formation. Her thesis makes two major breakthroughs, and represents the first major steps forward in these areas in more than a decade. Her work has enabled, for the first time, predictions to be made which can be compared against new observations which probe the neutral gas content of galaxies, opening up a completely novel way to constrain the models. The treatment of feedback from supernovae, and how this removes material from the interstellar medium, is also likely to have a lasting impact on the field. Claudia Lagos Ph.D. thesis was nominated by the Institute for Computational Cosmology at Durham University as an outstanding Ph.D. thesis 2012.
Chemical Evolution From Zero To High Redshift
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Author : Jeremy Walsh
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Chemical Evolution From Zero To High Redshift written by Jeremy Walsh and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.
A Statistical And Multi Wavelength Study Of Star Formation In Galaxies
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Author : Corentin Schreiber
language : en
Publisher: Springer
Release Date : 2016-09-12
A Statistical And Multi Wavelength Study Of Star Formation In Galaxies written by Corentin Schreiber and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-12 with Science categories.
This thesis presents a pioneering method for gleaning the maximum information from the deepest images of the far-infrared universe obtained with the Herschel satellite, reaching galaxies fainter by an order of magnitude than in previous studies. Using these high-quality measurements, the author first demonstrates that the vast majority of galaxy star formation did not take place in merger-driven starbursts over 90% of the history of the universe, which suggests that galaxy growth is instead dominated by a steady infall of matter. The author further demonstrates that massive galaxies suffer a gradual decline in their star formation activity, providing an alternative path for galaxies to stop star formation. One of the key unsolved questions in astrophysics is how galaxies acquired their mass in the course of cosmic time. In the standard theory, the merging of galaxies plays a major role in forming new stars. Then, old galaxies abruptly stop forming stars through an unknown process. Investigating this theory requires an unbiased measure of the star formation intensity of galaxies, which has been unavailable due to the dust obscuration of stellar light.
Planets To Cosmology
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Author : Mario Livio
language : en
Publisher: Cambridge University Press
Release Date : 2006-04-06
Planets To Cosmology written by Mario Livio and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-04-06 with Science categories.
This book acknowledges the importance of identifying the most crucial science to be performed by the superb Hubble Telescope. With this goal in mind, the book presents a review of some of the most important open questions in astronomy. World experts examine topics ranging from extrasolar planets and star formation to supermassive black holes and the reionization of the universe. Special emphasis is placed on what astronomical observations should be carried out during the next few years to enable breakthroughs in our understanding of a complex and dynamic universe. In particular, the reviewers attempt to identify those topics to which the Hubble Space Telescope can uniquely contribute. The special emphasis on future research makes this book an essential resource for both professional researchers and graduate students in astronomy and astrophysics.
Science With The Atacama Large Millimeter Array
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Author : Rafael Bachiller
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-04-03
Science With The Atacama Large Millimeter Array written by Rafael Bachiller and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-03 with Science categories.
Currently under construction in Northern Chile, the Atacama Large Millimeter Array (ALMA) is the most ambitious astronomy facility under construction. This book describes the enormous capabilities of ALMA, the state of the project, and most notably the scientific prospects of such a unique facility. The book includes reviews and recent results on most hot topics of modern astronomy. It looks forward to the revolutionary results that are likely to be obtained with ALMA.
The Nature Of Dusty Star Forming Galaxies
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Author : William Cowley
language : en
Publisher: Springer
Release Date : 2017-10-02
The Nature Of Dusty Star Forming Galaxies written by William Cowley and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-02 with Science categories.
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).