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Dissertations / Theses on the topic 'Star cluster formation and evolution'

Author: Grafiati
Published: 10 March 2023
Last updated: 31 July 2025

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1

Adamo, A., J. E. Ryon, M. Messa, et al. "Legacy ExtraGalactic UV Survey with The Hubble Space Telescope: Stellar Cluster Catalogs and First Insights Into Cluster Formation and Evolution in NGC 628." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624449.

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We report the large effort that is producing comprehensive high-level young star cluster (YSC) catalogs for a significant fraction of galaxies observed with the Legacy ExtraGalactic UV Survey (LEGUS) Hubble treasury program. We present the methodology developed to extract cluster positions, verify their genuine nature, produce multiband photometry (from NUV to NIR), and derive their physical properties via spectral energy distribution fitting analyses. We use the nearby spiral galaxy NGC 628 as a test case for demonstrating the impact that LEGUS will have on our understanding of the formation
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Messa, M., A. Adamo, G. Östlin, et al. "The young star cluster population of M51 with LEGUS – I. A comprehensive study of cluster formation and evolution." OXFORD UNIV PRESS, 2018. http://hdl.handle.net/10150/626277.

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Recently acquired WFC3 UV (F275W and F336W) imaging mosaics under the Legacy Extragalactic UV Survey (LEGUS), combined with archival ACS data of M51, are used to study the young star cluster (YSC) population of this interacting system. Our newly extracted source catalogue contains 2834 cluster candidates, morphologically classified to be compact and uniform in colour, for which ages, masses and extinction are derived. In this first work we study the main properties of the YSC population of the whole galaxy, considering a mass-limited sample. Both luminosity and mass functions follow a power-la
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3

Simanton, Lesley Ann. "Star Cluster Populations in the Spiral Galaxy M101." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1437587267.

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4

Anders, Peter. "Formation and evolution of star clusters in interacting galaxies." Doctoral thesis, [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/anders.

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5

Goodwin, S. P. "The early dynamical evolution of globular clusters." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360496.

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6

Lyo, A.-Ran Physical Environmental &amp Mathematical Sciences Australian Defence Force Academy UNSW. "The nearby young [special character] Chamaeleontis cluster as a laboratory for star formation and evolution." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Physical, Environmental and Mathematical Sciences, 2004. http://handle.unsw.edu.au/1959.4/38707.

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[Special characters cannot be displayed. Please see the pdf version of the Abstract for an accurate reproduction.] We studied the circumstellar discs, the initial mass function (IMF), mass distribution, binarity and the fundamental properties of the [special character] 9 Myr-old pre-main sequence (PMS) [special character] Chamaeleontis cluster. Using JHKL colour-colour and colour-excess diagrams, we found the circumstellar disc fraction to be [special character] 0.60 among the late-type members. Four stars with [special character] (K - L) > 0.4 were identified as experiencing ongoing accretio
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Dorval, Julien. "Multi-scale approach of the formation and evolution of star clusters." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE021/document.

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Les jeunes amas d'étoiles sont sous-structurés et évoluent dynamiquement pour former des amas sphériques à l'équilibre. Je présente une nouvelle méthode pour générer des conditions initiales réalistes pour simuler ce processus: la fragmentation de Hubble-Lemaitre. Je laisse le système développer spontanément des surdensités au cours d'une expansion du système. Le modèle résultant se compare bien aux simulations hydrodynamiques de formation stellaire et aux observations des jeunes amas. Le modèle fragmenté s'effondre de manière plus douce qu'un modèle uniforme. L'injection d'une population d'ét
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8

Rudnick, Gregory, Jacqueline Hodge, Fabian Walter, et al. "Deep CO(1–0) Observations of z = 1.62 Cluster Galaxies with Substantial Molecular Gas Reservoirs and Normal Star Formation Efficiencies." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/627107.

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We present an extremely deep CO(1-0) observation of a confirmed z = 1.62 galaxy cluster. We detect two spectroscopically confirmed cluster members in CO(1-0) with signal-to-noise ratio >5. Both galaxies have log (M-star/M-circle dot) > 11 and are gas rich, with M-mol/(M-star + M-mol) similar to 0.17-0.45. One of these galaxies lies on the star formation rate (SFR)-M-star sequence, while the other lies an order of magnitude below. We compare the cluster galaxies to other SFR-selected galaxies with CO measurements and find that they have CO luminosities consistent with expectations given their i
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9

Tyler, Krystal D. "Star Formation and Galaxy Evolution in Different Environments, from the Field to Massive Clusters." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/265395.

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This thesis focuses on how a galaxy's environment affects its star formation, from the galactic environment of the most luminous IR galaxies in the universe to groups and massive clusters of galaxies. Initially, we studied a class of high-redshift galaxies with extremely red optical-to-mid-IR colors. We used Spitzer spectra and photometry to identify whether the IR outputs of these objects are dominated by AGNs or star formation. In accordance with the expectation that the AGN contribution should increase with IR luminosity, we find most of our very red IR-luminous galaxies to be dominated b
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10

Ziosi, Brunetto Marco. "The impact of stellar evolution and dynamics on the formation of compact-object binaries." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424212.

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The aim of this work is to study the formation and evolution of double compact-object binaries (DCOBs, i.e. black hole-black hole, black hole-neutron star and neutron star-neutron star binaries) in young (< 100 Myr) dense (>~ 10^3 star/pc^3) star clusters (YSCs). DCOBs, when merging, are expected to be powerful sources of gravitational waves (GWs) observable by Virgo and LIGO detectors. Best merger candidates (BMCs), i.e. those sources with a chance to be observed, have a coalescence timescale shorter than one Hubble time (t_H) and produce a signal strong enough (strain >~ 10^-21) to be
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Olsen, Knut A. G. "The formation and evolution of the large magellanic cloud from selected clusters and star fields /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5426.

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12

Lotz, Marcel [Verfasser], and Andreas [Akademischer Betreuer] Burkert. "Evolution of galactic star formation in galaxy clusters and post-starburst galaxies / Marcel Lotz ; Betreuer: Andreas Burkert." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/1232176338/34.

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13

Ruggiero, Rafael. "Galaxy Evolution in Clusters." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-14022019-140755/.

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In this thesis, we aim to further elucidate the phenomenon of galaxy evolution in the environment of galaxy clusters using the methodology of numerical simulations. For that, we have developed hydrodynamic models in which idealized gas-rich galaxies move within the ICM of idealized galaxy clusters, allowing us to probe in a detailed and controlled manner their evolution in this extreme environment. The main code used in our simulations is RAMSES, and our results concern the changes in gas composition, star formation rate, luminosity and color of infalling galaxies. Additionally to processes ta
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Cao, Orjales Jose Manuel. "A Study of AGN and their environments in the far-infrared." Thesis, University of Hertfordshire, 2014. http://hdl.handle.net/2299/14440.

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My Ph.D. has been composed of work involving the use of far–IR and submm observations of AGN. During this time it has focused on the in- terplay between AGN and their host galaxies and cluster environments. Understanding the role of AGN, and how they affect the evolution of both their host galaxies and surrounding environments, is a pressing concern in cosmological models of the universe, affecting as they do the chemical makeup, star formation rate, and morphology of their host galaxies. In Chapter 2, we focus on attempting to determine whether there is an inherent physical difference between
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Pope, Alexandra, Alfredo Montaña, Andrew Battisti, et al. "Early Science with the Large Millimeter Telescope: Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623817.

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We directly detect dust emission in an optically detected, multiply imaged galaxy lensed by the Frontier Fields cluster MACSJ0717.5+3745. We detect two images of the same galaxy at 1.1 mm with the AzTEC camera on the Large Millimeter Telescope leaving no ambiguity in the counterpart identification. This galaxy, MACS0717_Az9, is at z > 4 and the strong lensing model (mu = 7.5) allows us to calculate an intrinsic IR luminosity of 9.7 x 10(10) L-circle dot and an obscured star formation rate of 14.6 +/- 4.5 M-circle dot yr(-1). The unobscured star formation rate from the UV is only 4.1 +/- 0.3 M-
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Dias, Bruno Moreira de Souza. "Formation and evolution of globular clusters in the Galaxy and Magellanic Clouds." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-26082014-090039/.

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Globular clusters are tracers of the formation and evolution of their host galaxies. Kinematics, chemical abundances, age and position of the clusters allows tracing interactions between Milky Way and surrounding galaxies and outlines their chemical enrichment history. In this thesis we analyse mid-resolution spectra of about 800 red giant stars in 51 Galactic globular clusters. It is the first time that [Fe/H] and [Mg/Fe] derived in a consistent way are published for such a huge sample of globular clusters, almost 1/3 of the total number of catalogued clusters. Our metallicities are showed to
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17

Alberts, Stacey, Alexandra Pope, Mark Brodwin, et al. "STAR FORMATION AND AGN ACTIVITY IN GALAXY CLUSTERS FROM z = 1–2: A MULTI-WAVELENGTH ANALYSIS FEATURING HERSCHEL /PACS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621395.

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We present a detailed, multi-wavelength study of star formation (SF) and active galactic nucleus (AGN) activity in 11 near-infrared (IR) selected, spectroscopically confirmed massive (greater than or similar to 10(14)M(circle dot)) galaxy clusters at 1 < z < 1.75. Using new deep Herschel/PACS imaging, we characterize the optical to far-IR spectral energy distributions (SEDs) for IR-luminous cluster galaxies, finding that they can, on average, be well described by field galaxy templates. Identification and decomposition of AGNs through SED fittings allows us to include the contribution to clust
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Paccagnella, Angela. "Galaxies on the road to quenching." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424851.

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This thesis explores the properties of galaxies that reside in high density regions in the local Universe. The driving motivation is to shed light on how galaxies stop forming stars and the role played by the environment in this process. A wide variety of environmentallyrelated quenching mechanisms have been proposed and the smoking gun proving that these are actually transforming galaxies from being star forming to passive is the existence of a population of galaxies in transition with intermediate features. In this Thesis I will mainly focus on the properties of two population of galaxies: t
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Xue, Rui, Kyoung-Soo Lee, Arjun Dey та ін. "The Diversity of Diffuse Ly α Nebulae around Star-forming Galaxies at High Redshift". IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623866.

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We report the detection of diffuse Ly alpha emission, or Lya halos (LAHs), around star-forming galaxies at z approximate to 3.78 and 2.66 in the NOAO Deep Wide-Field Survey Bootes field. Our samples consist of a total of similar to 1400 galaxies, within two separate regions containing spectroscopically confirmed galaxy overdensities. They provide a unique opportunity to investigate how the LAH characteristics vary with host galaxy large-scale environment and physical properties. We stack Ly alpha images of different samples defined by these properties and measure their median LAH sizes by deco
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20

Lee-Brown, Donald B., Gregory H. Rudnick, Ivelina G. Momcheva, et al. "The Ages of Passive Galaxies in a z = 1.62 Protocluster." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/625163.

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We present a study of the relation between galaxy stellar age and mass for 14 members of the z = 1.62 protocluster IRC 0218, using multiband imaging and HST G102 and G141 grism spectroscopy. Using UVJ colors to separate galaxies into star-forming and quiescent populations, we find that, at stellar masses M*>= 10(10.85)M circle dot the quiescent fraction in the protocluster is f(Q) = 1.0(-0.37)(+0.00), consistent with a similar to 2x enhancement relative to the field value, f(Q) = 0.45(-0.03)(+0.03). At masses 10(10.2)M circle dot <= M* <= 10(10.85)M circle dot, f(Q) in the cluster is f(Q) = 0.
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21

Mulia, Alexander John. "Stellar Populations in Nearby Merging Galaxies." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1449827923.

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22

Dale, J. E. "Feedback in star cluster formation." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598249.

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Massive stars emit strong fluxes of ionising radiation and their dynamical impact on their natal clusters is expected to be severe. The outflows generated expel residual gas from the cluster and can potentially gravitationally disrupt it. The loss of its reserves of molecular gas also prevents the cluster forming more stars. Star-formation and star cluster evolution cannot be fully understood without a proper treatment of feedback. I present a novel technique I have developed to allow the inclusion of the effects of ionising radiation in smoothed particle hydrodynamics (SPH) simulations of sta
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23

Guglielmo, Valentina. "Groups and clusters of galaxies in the XXL survey." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3421945.

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This thesis presents one of the first census of the properties of galaxies in X-ray selected groups and clusters at intermediate redshift, with the aim of assessing the role of envi- ronment on the galaxy stellar mass assembly, star formation activity and observed stellar population properties. My project is framed in the XXL Survey (Pierre et al. 2016), the largest XMM-Newton programme approved to date, covering two extragalactic regions in the sky of 25 deg2 each one. Extended X-ray sources identified as groups and clusters are spectroscopically confirmed and their main properties are chara
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24

Breen, Philip Gavin. "Dynamical evolution of idealised star cluster models." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8296.

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This thesis is concerned with the dynamical evolution of globular star clusters modelled as the classical gravitational N-body problem. The models in this thesis are idealised in order to allow the detailed study of particular dynamical aspects of the cluster evolution. Examples of properties which tend to be omitted are stellar evolution, primordial binaries and the effect of an external tidal gravitational field. The methods used in this thesis are gas models, N-body models and physical arguments. One of the main topics in this thesis is gravothermal oscillations in multicomponent star clust
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Bica, Eduardo. "Une nouvelle approche pour la synthese de populations stellaires dans les galaxies." Paris 7, 1987. http://www.theses.fr/1987PA077092.

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Nouvelle methode pour la synthese de populations stellaires dans les noyaux de galaxies utilisant une bibliotheque de spectres integres d'amas d'etoiles. L'avantage de cette methode porte sur deux parametres: l'age et la metallicite. Une attention speciale a ete donnee aux differentes sources de rougissement interstellaire affectant les amas d'etoiles et les galaxies. Cette approche permet une estimation directe de l'evolution chimique a partir du spectre en absorption des noyaux de galaxies
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Canning, Rebecca Elizabeth Ann. "Star and filament formation in brightest cluster galaxies." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610523.

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Santoro, Fernando. "Semi analytical simulations of primordial star cluster formation." Thesis, University of Sussex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288843.

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Fensch, Jérémy. "Star and stellar cluster formation in gas-dominated galaxies." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC207/document.

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Nous étudions la formation d’étoiles et d’amas d’étoiles dans les galaxies dominées par le gaz. Ce terme réfère en premier lieu aux galaxies de l’époque du pic de formation d’étoiles dans l’histoire de l’Univers, qui s’est déroulé vers z ~ 2, mais aussi à leurs analogues locaux, les galaxies naines de marées. En premier lieu, en utilisant des simulations numériques, nous montrons que les galaxies massives typiques de z=2, avec une fraction de gaz d’environ 50%, forment des structures gazeuses massives (10**7-8 masses solaires) et liées gravitationnellement, appelées grumeaux dans la suite. Ces
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Thomas, Claire F. "Environmental dependence of star formation in field and cluster galaxies." Thesis, Liverpool John Moores University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439066.

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Harris, William E., Stephanie M. Ciccone, Gwendolyn M. Eadie, et al. "GLOBULAR CLUSTER SYSTEMS IN BRIGHTEST CLUSTER GALAXIES. III. BEYOND BIMODALITY." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/622870.

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We present new deep photometry of the rich globular cluster (GC) systems around the Brightest Cluster Galaxies UGC 9799 (Abell 2052) and UGC 10143 (Abell 2147), obtained with the Hubble Space Telescope (HST) ACS and WFC3 cameras. For comparison, we also present new reductions of similar HST/ACS data for the Coma supergiants NGC 4874 and 4889. All four of these galaxies have huge cluster populations (to the radial limits of our data, comprising from 12,000 to 23,000 clusters per galaxy). The metallicity distribution functions (MDFs) of the GCs can still be matched by a bimodal-Gaussian form whe
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31

Tsai, Chao-Wei. "Star cluster formation in the nuclear regions of nearby spiral galaxies." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1997620851&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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32

Bell, Eric Findlay. "Exploring the star formation histories of galaxies." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4796/.

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In this thesis, I explore the star formation histories of both spiral and elliptical galaxies. In Part 1,1 present an in-depth study of the star formation histories of spiral galaxies with a wide range of properties. Optical and near-infrared colours are used in conjunction with up-to-date stellar population synthesis models to constrain the ages and metallicities of my sample galaxies. I find that age and metallicity gradients are common in spiral galaxies of all types. The age of a spiral galaxy correlates mainly with its surface brightness, and its metallicity correlates strongly with both
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Northeast, Mark Steven. "Evolution of galaxies : star formation histories in nearby spheroids." Thesis, University of Central Lancashire, 2006. http://clok.uclan.ac.uk/7805/.

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This thesis is about an investigation into the formation of spheroidal type galaxies. The investigation began with modelling studies of early-type galaxies and spiral bulges (SBs). From galaxy formation modelling studies led by experiments with a sample galaxy, some results were obtained; nonsolar abundance ratios in Elliptical galaxies (Es) achieved better fits between model and data than solar abundance ratios. For both early-type and late-type galaxies, best fits with non-solar abundance ratios were more constrained than in the solar abundance ratio case. A strong link between star formatio
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Pacifici, Camilla, Susan A. Kassin, Benjamin J. Weiner, et al. "THE EVOLUTION OF STAR FORMATION HISTORIES OF QUIESCENT GALAXIES." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622457.

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Although there has been much progress in understanding how galaxies evolve, we still do not understand how and when they stop forming stars and become quiescent. We address this by applying our galaxy spectral energy distribution models, which incorporate physically motivated star formation histories (SFHs) from cosmological simulations, to a sample of quiescent galaxies at 0.2 < z < 2.1. A total of 845 quiescent galaxies with multi-band photometry spanning rest-frame ultraviolet through near-infrared wavelengths are selected from the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (C
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Twite, Joanathan W. "Galaxy star formation and mass growth since z=3." Thesis, University of Nottingham, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.718862.

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In this thesis we investigate the evolution of galaxies since z = 3. There are several methods to measure the star formation rate (SFR) of galaxies, they all however have drawbacks. Several studies have investigated the SFR at high redshifts using SFR trac­ers that suffer from uncertainties, either from the tracer used, or from the uncertainties correcting for the effects of dust. We have new measurements of the Ha emission line for a sample of galaxies at =~1; Ha is a more accurate SFR-tracer than other com­monly used tracers, but until now had been technically difficult to measure at : > 0.8
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Kuntschner, Harald. "The star formation history of early-type galaxies in the Fornax cluster." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4849/.

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We have measured central line strengths and line-strength gradients for a complete sample of early-type galaxies in the Fornax cluster, comprising 11 elliptical and 11 lenticular galaxies, more luminous than M(_B) = -17. We find that the centres of Fornax ellipticals follow the locus of galaxies of fixed age in Worthey's models and have metallicities varying roughly from half solar to 2.5 times solar. Line-strength gradients indicate that elliptical galaxies do not show age gradients with radius but do exhibit a decrease of ~ 0.4 dex in [Fe/H] between the centre and one effective radius. The c
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Molnár, Dániel Csaba. "Tracing star formation and AGN activity at radio frequencies." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/79453/.

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My research has focused on locating and measuring star formation and AGN activity in different environments with interferometric and single-dish radio observations. As my first PhD project, I studied the complex interaction between an intermediate redshift (z 0.3) starburst galaxy and a nearby ( 7 kpc separation) QSO using sub-arcsecond VLA observations. I found new evidence for jet-induced star formation activity in the companion galaxy, making the system a strong candidate for this rare, and potentially important process in the early Universe. In my second paper, I investigated the infrared-
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Zaurin, Javier Rodriguez. "The star formation histories and evolution of ultraluminous infrared galaxies." Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489391.

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Chamcham, Khalil. "The evolution of galactic discs with a star formation threshold." Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262321.

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Ruffle, Deborah Patricia. "The physical and chemical evolution of star forming regions." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300792.

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Vincke, Kirsten [Verfasser], and Susanne [Gutachter] Pfalzner. "How star cluster evolution shapes protoplanetary disc sizes / Kirsten Vincke ; Gutachter: Susanne Pfalzner." Köln : Universitäts- und Stadtbibliothek Köln, 2018. http://d-nb.info/1191895785/34.

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Pozzo, Monica. "The effect of high-mass stars on low-mass star formation." Thesis, Keele University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366445.

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Takahashi, Sanemichi. "Formation and evolution of the protoplanetary disks." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199099.

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Burton, Christopher Steven. "The environmental dependence of galaxy evolution." Thesis, University of Hertfordshire, 2013. http://hdl.handle.net/2299/12572.

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Observations of galaxy environments have revealed numerous correlations associated with their intrinsic properties. It is therefore clear that if we are to understand the processes by which galaxies form and evolve, we have to consider the role of their immediate environment and how these trends change across cosmic time. In this thesis, I investigate the relationship between the environmental densities of galaxies and their associated properties by developing and implementing a novel approach to measuring galaxy environments on individual galaxy scales with Voronoi tessellations. Using optica
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Ownsworth, Jamie Richard. "Star formation and the evolution of massive galaxies across cosmic time." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/27762/.

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This thesis investigates the evolution of massive galaxies throughout the last 11 billion years using measured stellar masses and star formation rates. Firstly, we present a study of the resolved star-forming properties of a sample of distant massive (M > 10{11}) galaxies in the GOODS NICMOS Survey (GNS) within the redshift range 1.5 < z < 3 in order to measure the spatial location of ongoing star formation (SF). We find that the SFRs present in different regions of a galaxy reflect the already existent stellar mass density, i.e. high density regions have higher SFRs than lower density regions
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Davies, Richard Ian. "Structure and evolution of star formation in starburst galaxies and AGN." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390490.

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Davies, Claire L. "Revolution evolution : tracing angular momentum during star and planetary system formation." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7557.

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Stars form via the gravitational collapse of molecular clouds during which time the protostellar object contracts by over seven orders of magnitude. If all the angular momentum present in the natal cloud was conserved during collapse, stars would approach rotational velocities rapid enough to tear themselves apart within just a few Myr. In contrast to this, observations of pre-main sequence rotation rates are relatively slow (∼ 1 − 15 days) indicating that significant quantities of angular momentum must be removed from the star. I use observations of fully convective pre-main sequence stars in
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Cai, Zheng. "Cosmic Structure Formation: From First Star to Large-scale Filamentary Structure." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/578387.

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Theory of cosmic structure formation outlines how stars, galaxies, clusters of galaxies, and large-scale structures formed out of primordial density fluctuations. It presents us a picture of cosmic mass assembly, and places strong constraints on cosmological model. Both observations and theories suggest that structures formation follows a "bottom up" process, in which small, low-mass component form first, and gradually develop into larger, more massive systems. This dissertation focuses on three crucial stages of cosmic structure formation: first generation stars, quasar host galaxies and the
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49

Wijesinghe, Dinuka. "Galaxy star formation rates and their relation to galaxy environments." Thesis, The University of Sydney, 2012. https://hdl.handle.net/2123/28926.

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This thesis investigates various methods of dust obscuration measurements in order to derive accurate SFRs which I then use to investigate the SFR-density relation. I present self-consistent star formation rates derived through pan-spectral analysis of galaxies drawn from the Galaxy and Mass Assembly (GAMA) survey. I determine the most appropriate form of dust obscuration correction via application of a range of extinction laws drawn from the literature as applied to Ha, [On] and UV luminosities. I consider several different obscuration curves, including those of Milky Way, Calzetti (2001) a
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50

Hughes, Thomas Marcus. "A phenomenological study of star formation and chemical evolution in nearby galaxies." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54133/.

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The main aims of this thesis are: (a) an investigation into the evolutionary histories of nearby galaxies, via the use of ultraviolet-infrared colour-mass diagrams, to uncover the dominant mechanism driving nearby galaxy evolution; (b) the determination of the impact of feedback from active galactic nuclei on star formation; and (c) a study of chemical evolution of star-forming galaxies in different environments. The analysis confirms recent observations of a population of late-type galaxies with reduced levels of star formation. I demonstrate that feedback from active nuclei is unlikely to be
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