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Dissertations / Theses on the topic 'Stellar feedbacks'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Maillard, Vincent. "Modèle des fronts de photoevaporation dans les régions de formation d'étoiles." Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLO003.

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Les conditions de formation des étoiles est un sujet central en astrophysique. Le taux de formation stellaire (SFR) est relié à la masse de gaz moléculaire par la relation de Schmidt-Kennicutt. Une étoile modifie son nuage parent grâce aux vents, jets et à son rayonnement, balayant son environnement, détruisant des sites de formation d’étoiles, mais pouvant aussi en compresser et déstabiliser, déclenchant la formation de nouvelles étoiles. Ma thèse s’est concentrée sur la rétroaction radiative, largement dominée par celle des étoiles massives. Cela crée une région ionisée en expansion au plus

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2

Rogers, Hazel Claire. "Feedback from winds and supernovae in massive stellar clusters." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/6858/.

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This thesis contains a study of the mechanical feedback from winds and supernovae on inhomogeneous molecular material left over from the formation of a massive stellar cluster. Firstly, the mechanical input from a cluster with three massive O-stars into a giant molecular cloud (GMC) clump containing 3240M⊙ of molecular material within a 4 pc radius is investigated using a 3D hydrodynamcial model. The cluster wind blows out of the molecular clump along low-density channels, into which denser clump material is entrained. The densest regions are surprisingly resistant to ablation by the cluster w

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3

Giarrusso, Daniele. "Properties of the galactic-scale gas circulation generated by stellar feedback." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20942/.

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Questo lavoro di tesi si propone di esaminare la simulazione di una galassia isolata simile alla Via Lattea e, in particolare, di analizzare i processi di feedback dovuto ad esplosioni di supernove, il meccanismo responsabile della generazione di outflow gassosi dal disco. Scopo della tesi è quello di testare la validità dei risultati ottenuti dalla simulazione (generata dal recente modello di feedback SMUGGLE presente nel codice a griglia mobile AREPO) dal punto di vista della formazione stellare, del tasso di esplosioni di supernove e dei fenomeni di outflow di gas su scala galattica. Sono

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4

Rey, Raposo Ramon. "The interplay between stellar feedback and galactic environment in molecular clouds." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/21022.

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In this thesis we address the problem of understanding the star formation process in giant molecular clouds in a galactic context. Most simulations of molecular clouds to date use an oversimplified set of initial conditions (turbulent spheres/boxes or colliding flows). Full galactic scale models are able to generate molecular clouds with complex morphologies and velocity fields but they fail to reproduce in detail the effects that occur at sub-pc scales (e.g. stellar feedback). Our goal is to build the bridge between these two scenarios, and to model the star formation process in molecular clo

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5

Smith, Matthew Carey. "Modelling star formation and stellar feedback in numerical simulations of galaxy formation." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277830.

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Remarkable progress has been made over the last few decades in furthering our understanding of the growth of cosmic structure. Nonetheless, there remains a great deal of uncertainty regarding the precise details of the complex baryonic physics that regulate galaxy formation. Any theory of star formation in galaxies must encompass the radiative cooling of gas into dark matter haloes, the formation of a turbulent, multiphase interstellar medium (ISM), the efficiency with which molecular gas is able to collapse into cores and ultimately stars, and the subsequent interaction of those stars with th

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6

Jose, Jessy, Jinyoung S. Kim, Gregory J. Herczeg, et al. "STAR FORMATION IN W3—AFGL 333: YOUNG STELLAR CONTENT, PROPERTIES, AND ROLES OF EXTERNAL FEEDBACK." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621216.

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One of the key questions in the field of star formation is the role of stellar feedback on the subsequent star formation process. The W3 giant molecular cloud complex at the western border of the W4 super bubble is thought to be influenced by the massive stars in W4. This paper presents a study of the star formation activity within AFGL. 333, a similar to 104 M-circle dot cloud within W3, using deep JHK(s) photometry obtained from the NOAO Extremely Wide Field Infrared Imager combined with Spitzer IRAC and MIPS photometry. Based on the infrared excess, we identify 812 candidate young stellar o

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7

Lochhaas, Cassandra Derrick. "Stellar Feedback in Galaxies, Its Impact on the Circumgalactic Medium, and the Importance of Radiative Cooling." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1562676332648711.

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8

Grisdale, Kearn. "The role of stellar feedback on the structure of the ISM and star formation in galaxies." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/841384/.

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Stellar feedback refers to the injection of energy, momentum and mass into the interstellar medium (ISM) by massive stars. This feedback owes to a combination of ionising radiation, radiation pressure, stellar winds and supernovae and is likely responsible both for the inefficiency of star formation in galaxies, and the observed super-sonic turbulence of the ISM. In this thesis, I study how stellar feedback shapes the ISM thereby regulating galaxy evolution. In particular, I focus on three key questions: (i) How does stellar feedback shape the gas density distribution of the ISM? (ii) How does

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9

DECATALDO, DAVIDE. "The Effect of Stellar and Quasar Feedback on the Interstellar Medium: Structure and Lifetime of Molecular Clouds." Doctoral thesis, Scuola Normale Superiore, 2020. http://hdl.handle.net/11384/90712.

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10

Serrano, Medina Sac Nicte Xiomara [Verfasser]. "Radio emission from massive Young Stellar Objects and their surroundings : Characterization and feedback / Sac Nicte Xiomara Serrano Medina." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1221668978/34.

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11

Engels, Jan Frederik [Verfasser], Jens [Akademischer Betreuer] [Gutachter] Niemeyer, and Ansgar [Gutachter] Reiners. "Modelling turbulent effects of stellar feedback in cosmological simulations / Jan Frederik Engels ; Gutachter: Jens Niemeyer, Ansgar Reiners ; Betreuer: Jens Niemeyer." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1143231082/34.

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12

Haid, Sebastian [Verfasser], Stefanie [Gutachter] Walch-Gassner, Cristiano [Gutachter] Porciani, and Joachim [Gutachter] Saur. "The Impact of Stellar Feedback from Massive Stars in the Interstellar Medium / Sebastian Haid ; Gutachter: Stefanie Walch-Gassner, Cristiano Porciani, Joachim Saur." Köln : Universitäts- und Stadtbibliothek Köln, 2018. http://d-nb.info/1173321934/34.

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13

Körtgen, Bastian [Verfasser], and Robi [Akademischer Betreuer] Banerjee. "Formation and Evolution of Magnetised and Turbulent Molecular Clouds : Varying Initial Conditions and the Role of Stellar Feedback / Bastian Körtgen. Betreuer: Robi Banerjee." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1093411600/34.

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14

Rahner, Daniel [Verfasser], and Simon [Akademischer Betreuer] Glover. "Stellar feedback and the self-regulation of star formation in giant molecular clouds: a new semi-analytic approach / Daniel Rahner ; Betreuer: Simon Glover." Heidelberg : Universitätsbibliothek Heidelberg, 2019. http://d-nb.info/1191760472/34.

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15

Petkova, Maya Atanasova. "Cloudy with a chance of starlight : coupling of smoothed particle hydrodynamics and Monte Carlo radiative transfer for the study of ionising stellar feedback." Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/16557.

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Ionising radiation is present in a variety of astrophysical problems, and it is particularly important for shaping the process of star formation in molecular clouds, containing hot, high-mass stars. In order to account for the effects of ionising radiation within numerical models of star formation, we need to combine a hydrodynamics method with a radiative transfer method and obtain a radiation hydrodynamics scheme (RHD). In this thesis I achieve live radiation hydrodynamics by coupling the Smoothed Particle Hydrodynamics (SPH) code Phantom with the Monte Carlo Radiative Transfer (MCRT) code C

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16

Körtgen, Bastian Verfasser], and Robi [Akademischer Betreuer] [Banerjee. "Formation and Evolution of Magnetised and Turbulent Molecular Clouds : Varying Initial Conditions and the Role of Stellar Feedback / Bastian Körtgen. Betreuer: Robi Banerjee." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:18-77743.

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17

Ruda, Sonja. "Aufgaben stellen, lösen und korrigieren eine sprachpragmatische Analyse für ein lehrerunterstützendes Feedback-Werkzeug im E-Learning." Duisburg Univ.-Verl. Rhein-Ruhr, 2006. http://d-nb.info/989792250/04.

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18

Ruda, Sonja [Verfasser]. "Aufgaben stellen, lösen und korrigieren : Eine sprachpragmatische Analyse für ein lehrerunterstützendes Feedback-Werkzeug im E-Learning / Sonja Ruda." Duisburg : Universitätsverlag Rhein-Ruhr, 2008. http://d-nb.info/1147972133/34.

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19

Ficut-Vicas, Dana. "Star formation in LITTLE THINGS dwarf galaxies." Thesis, University of Hertfordshire, 2015. http://hdl.handle.net/2299/17095.

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In this thesis we test and expand our current knowledge of Star Formation Laws (SF laws) in the extreme environment of dwarf irregular galaxies. We focus on the SF characteristics of our 18 galaxies sample, extending current investigations of the Schmidt-Kennicutt law to the low luminosity, low metallicity regime. The Hi data used in this project have been observed, calibrated and imaged according to the LITTLE THINGS Survey prescription to which I brought my own contribution as a member of the team. Apart from high resolution, VLA data in B, C and D array configurations, this project makes us

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20

Pipitone, Girolamo. "La Web Democracy in Europa: Il caso italiano e il caso tedesco." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6709/.

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• Che ruolo ha la Democrazia su Internet? • Chi cerca di applicare i suoi principi soprattutto in Europa? • Quali sono gli strumenti utilizzati da questi soggetti? Queste sono le domande a cui l'elaborato cerca di rispondere. Per caso italiano e caso tedesco si intendono le due entità politiche che più di tutti hanno cercato e cercano ancora di sfruttare le potenzialità di Internet per lo sviluppo della Democrazia Diretta e Liquida.

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21

Dunne, Bryan C. "Stellar energy feedback in superbubbles /." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3269884.

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Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.<br>Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4537. Adviser: You-Hua Chu. Includes bibliographical references (leaves 146-152) Available on microfilm from Pro Quest Information and Learning.

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22

Su, Kung-Yi. "Stellar Feedback, AGN Feedback and Fluid Microphysics in Galaxy Evolution." Thesis, 2019. https://thesis.library.caltech.edu/11518/1/Final_Caltech_Thesis_Kung-Yi_Su.pdf.

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<p>Understanding how the baryonic physics affects the formation and evolution of galaxies is one of the most critical questions in modern astronomy. Significant progress in understanding stellar feedback and modeling them explicitly in simulations have made it possible to reproduce a wide range of observed galaxy properties. However, there are still various pieces of missing physics and uncertainties in galaxies of different mass range.</p> <p>In this thesis, I will explore these missing pieces in baryonic physics on top of the Feedback in Realistic Environments (FIRE) stellar feedback in t

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23

Li, Zhiyuan. "The role of stellar feedback in galaxy evolution." 2009. https://scholarworks.umass.edu/dissertations/AAI3349728.

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Aiming at understanding the role of stellar feedback in galaxy evolution, I present a study of the hot interstellar medium in several representative galaxies, based primarily on X-ray observations as well as theoretical modelling. I find that, in the massive disk galaxies NGC2613 and M104, the observed amount of hot gas is much less than that predicted by current galaxy formation models. Such a discrepancy suggests a lack of appropriate treatments of stellar/AGN feedback in these models. I also find that stellar feedback, primarily in the form of mass loss from evolved stars and energy release

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24

Zhiyuan, Li. "The Role of Stellar Feedback in Galaxy Evolution." 2009. https://scholarworks.umass.edu/open_access_dissertations/14.

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Aiming at understanding the role of stellar feedback in galaxy evolution, I present a study of the hot interstellar medium in several representative galaxies, based primarily on X-ray observations as well as theoretical modelling. I find that, in the massive disk galaxies NGC2613 and M104, the observed amount of hot gas is much less than that predicted by current galaxy formation models. Such a discrepancy suggests a lack of appropriate treatments of stellar/AGN feedback in these models. I also find that stellar feedback, primarily in the form of mass loss from evolved stars and energy release

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25

Emerick, Andrew James. "Stellar Feedback and Chemical Evolution In Dwarf Galaxies." Thesis, 2019. https://doi.org/10.7916/d8-29kz-8d92.

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Motivated by the desire to investigate two of the largest outstanding problems in galactic evolution -- stellar feedback and galactic chemical evolution -- we develop the first set of galaxy-scale simulations that simultaneously follow star formation with individual stars and their associated multi-channel stellar feedback and multi-element metal yields. We developed these simulations to probe the way in which stellar feedback, including stellar winds, stellar radiation, and supernovae, couples to the interstellar medium (ISM), regulates star formation, and drives outflows in dwarf galaxies. W

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26

Engels, Jan Frederik. "Modelling turbulent effects of stellar feedback in cosmological simulations." Doctoral thesis, 2017. http://hdl.handle.net/11858/00-1735-0000-0023-3F4E-C.

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27

Grudić, Michael Yvan. "The Role of Stellar Feedback in Star Cluster Formation." Thesis, 2019. https://thesis.library.caltech.edu/11708/1/MYG_Thesis.pdf.

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<p>A methodology for numerical magnetohydrodynamics simulations of star cluster formation, accounting for all mechanisms of stellar feedback from massive stars, is developed and used to address a range of problems regarding the formation of stars and star clusters in giant molecular clouds (GMCs). These studies culminate in a new theoretical framework that connects properties of GMCs to those of the star clusters that form in them.</p> <p>The simulation methodology is established and tested, and the problem of the star formation efficiency (SFE) of molecular clouds is addressed. It is found

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28

Hong, Sungryong. "Constraining stellar feedback: Ionized gas structures in local starburst galaxies." 2011. https://scholarworks.umass.edu/dissertations/AAI3482631.

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Stellar feedback, i.e., the return of mechanical energy from supernova explosions, and massive star and AGN winds to the interstellar medium, is one of the fundamental processes that shape galaxy evolution. Yet, some of its fundamental parameters, such as the efficiency of feedback, have not been solidly constrained from an observational point of view. In this thesis, we aim at addressing this issue. First, we investigate the kinematics of Damped Ly-alpha Absorbers (DLAs) at z = 3 using high-resolution cosmological hydrodynamical simulations. Our simulations include a heuristic model for galac

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29

Bildfell, Christopher John. "The Stellar Content in Clusters of Galaxies." Thesis, 2013. http://hdl.handle.net/1828/4562.

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We investigate three separate topics associated with the formation and evolution of the stellar mass component in galaxy clusters. The work presented herein is based primarily on optical imaging and spectra taken with, respectively, the Canada-France-Hawaii Telescope and Gemini North/South. We confront the result from the optical data analysis with the results from the analysis of high-resolution X-ray data taken with the Chandra and XMM-Newton space observatories. Confirming earlier results, we find that 22% of brightest cluster galaxies (BCGs) show central inversions in their optical colo

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30

Hummels, Cameron Bryce. "Comparing Simulations and Observations of Galaxy Evolution: Methods for Constraining the Nature of Stellar Feedback." Thesis, 2012. https://doi.org/10.7916/D8SN0H1C.

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Computational hydrodynamical simulations are a very useful tool for understanding how galaxies form and evolve over cosmological timescales not easily revealed through observations. However, they are only useful if they reproduce the sorts of galaxies that we see in the real universe. One of the ways in which simulations of this sort tend to fail is in the prescription of stellar feedback, the process by which nascent stars return material and energy to their immediate environments. Careful treatment of this interaction in subgrid models, so-called because they operate on scales below the reso

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