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Tesi sul tema "Astronomical spectroscopy"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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1

Tulloch, Simon. "Astronomical spectroscopy with electron multiplying CCDs." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522382.

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2

Shaw, Graham David. "New techniques in astronomical multi-slit spectroscopy." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5643/.

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LDSS-2 is a low dispersion survey spectrograph for the William Herschel Telescope. It was constructed to meet an increasing demand for large scale statistical surveys of stellar and galactic populations. This thesis describes its design, construction and installation, together with additional research concerning the fabrication of multi-slit aperture masks.LDSS-2 has a similar optical system to its predecessor LDSS-1, but it can hold greater numbers of aperture masks, filters and grisms, and its control system is fully automated. This is expected to improve its observing efficiency and allow L

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3

Watson, Frederick Garnett. "Multi-object astronomical spectroscopy with optical fibres." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/27619.

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A full account is given of the relatively new astronomical technique of multi- object spectroscopy with optical fibre lightguides. The thesis begins with a survey of the number densities of a wide range of astronomi- cal object classes, and, after comparing the merits of the various techniques for multi- object spectroscopy, shows (by defining the "effective aperture" of a multiple fibre - coupled telescope) that the multi -fibre tech- nique is very well- suited to the real distribution of celestial objects. A review of the properties of optical fibres is given, together with an exposition of

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4

Haynes, Roger. "Infrared fibres in astronomical instrumentation." Thesis, Durham University, 1995. http://etheses.dur.ac.uk/5402/.

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For several years multi-object spectroscopy systems have been available for carrying out survey work in the visible region, but until very recently there has not been a system for the near infrared region. This thesis describes the design, manufacture and commissioning of the first multi-object fibre system for near infrared spectroscopy. SMIRFS (Spectroscopic Multi-object Infrared Fibre System) is a prototype system that has been designed at the Department of Physics in Durham to couple the Cassegrain focus of the United Kingdom InfraRed Telescope (UKIRT) to a cooled long slit infrared spectr

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5

Porter, Martin John. "A CCD camera system for use in echelle spectroscopy /." St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17953.pdf.

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6

Carrasco, Bertha Esperanza. "Further developments of optical fibre techniques for astronomical spectroscopy." Thesis, Durham University, 1992. http://etheses.dur.ac.uk/6029/.

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This thesis describes instrumental techniques pursued to optimise the quality of the spectroscopic data which will be obtained via the new generation of multifibre systems. The technical aspects discussed include the instrumental sources of systematic errors on sky subtraction and new methods to evaluate the fibre performance in terms of throughput and preservation of the input focal ratio. The limiting factor in faint multifibre spectroscopy is the accuracy and reliability of sky subtraction. Instrumentality the precision to which sky subtraction can be done is limited by systematic errors. T

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7

Lee, David. "New techniques in astronomical spectroscopy for 8-m telescopes." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4847/.

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The purpose of this thesis is to investigate new instrument technology to enhance the capabilities of 8-m telescopes. This thesis first describes the theory, design, construction, and testing of an immersed grating. Immersed gratings can be used to provide R≥ 10(^4) with a multi-object and/or integral field spectrograph on an 8-m telescope. Immersed gratings allow high resolution to be achieved whilst maintaining the required pupil size at a level similar to that on 4-m telescopes. This thesis describes laboratory tests which verify that immersed gratings provide high resolution. The throughpu

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8

Clampin, Mark. "Investigation of a resistive anode detector for astronomical spectroscopy." Thesis, University of St Andrews, 1986. http://hdl.handle.net/10023/7110.

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A large format two dimensional photon counting detector has been evaluated as a detector for astronomical spectroscopy. The design comprises an 320 photocathode, a tandem MCP gain stage and a circular arc terminated resisitive anode to provide pOSitional coordinates of detected events. The system is run from an LSI 11/23 computer operating under FORTH control. The micro-channel plate operating characteristics and the detector's resolution, quantum efficiency and imaging performance have been studied. The principal areas requiring design improvement are found to be the micro-channel plate gain,

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9

Oates, Anthony Patrick. "A technique for astronomical spectroscopy with a multi-aperture telescope." Thesis, University of Central Lancashire, 1985. http://clok.uclan.ac.uk/19078/.

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A technique for acquiring spectral line data using a multi-aperture telescope is described. The multi-aperture principle and the criteria which led to the selection of a dispersive spectrometer are discussed. The problem of linking telescope and spectrometer has been solved by incorporating low loss optical fibres and this is also discussed. The problems of automatic data collection, its manipulation, display and storage presented a major research effort which were largely overcome by the use of cheap, digital micro-computers. To achieve rapid and flexible data handling the i.E.E.E. bus was us

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10

Bounissou, Sophie. "”On-chip” astronomical instrumentation : bringing polarimetric and spectroscopic capabilities to the detector level." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS400.

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Cette thèse étudie la possibilité d'intégrer plusieurs fonctions instrumentales au sein de la matrice de bolomètres pour les observations dans le domaine du sub-millimétrique. Ceci est désormais envisageable grâce aux progrès des micro-technologies.Dans un premier temps, nous avons optimisé le design des pixels polarimétriques inventés pour l'instrument B-BOP du futur observatoire spatial SPICA. Ce travail a notamment permis de quantifier la cross-polarisation (1/1000) et de repenser la géométrie des pixels afin d'obtenir des détecteurs mieux adaptés au rayonnement incident.Cette thèse a égale

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11

Gilbert, James Michael. "New developments in robotic fibre positioning for astronomical multi-object spectroscopy." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:ca88e3e2-cd47-422e-96a7-d644a88176d0.

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This thesis presents two bodies of work, both related to automated optical fibre positioning in highly-multiplexed astronomical instrumentation. Part one concerns the development and prototyping of a pick-and-place fibre positioner for WEAVE, a new 1000-fibre spectrograph for the 4.2 m William Herschel Telescope. This research has helped shape the positioner's final design and has included development of three novel techniques to enhance predicted performance: i) a scheme for automatically calibrating the fibre measurement system; ii) an algorithm for finding the centre of an imaged fibre with

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12

McGee, P. K. "Optical studies in high-energy astrophysics /." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phm14485.pdf.

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13

Keller, Luke David. "New devices and techniques for high resolution astronomical spectroscopy and a new study of old stars /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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14

Welsh, Frederick V. "Scientific application of the Santa Barbara instrument group self-guided spectrograph." Virtual Press, 2004. http://liblink.bsu.edu/uhtbin/catkey/1295146.

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The Santa Barbara Instrument Group self-guided spectrograph is aimed primarily at the advanced amateur astronomer. This study has determined that this instrument is capable of being used for scientific research. A comparison lamp box was built to be used in conjunction with the spectrograph. A test was conducted to determine the accuracy of the grating positioning micrometer. A chart was created to allow the conversion of the micrometer readings to correlate with the position of the low-dispersion grating. To determine the scientific applicability of the spectrograph, it was used to: (1) measu

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15

Waltham, Nicholas Richard. "The development of a detector system for faint object spectroscopy on the Isaac Newton Telescope." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6656/.

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The work reported in this thesis describes the development of the CCD instrumentation for the Faint Object Spectrograph on the 2.5m Isaac Newton Telescope at the Observatorio del Roque de los Muchachos, more commonly known as the La Palma Observatory. The Faint Object Spectrograph is a highly efficient, fixed-format CCD spectrograph aimed at low resolution spectrophotometry (15-20 A FWHM) over a wide spectral range (400-1050 nm). Its high throughput, compared with that of more conventional spectrographs, is due to the small number of optical surfaces, and the minimum vignetting which results f

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16

BECHTOLD, JILL ELEANOR. "HIGH RESOLUTION SPECTROSCOPY OF QUASAR ABSORPTION LINES (INTERGALACTIC MEDIUM, EXTRAGALACTIC, GALAXIES)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188085.

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This dissertation investigates the properties of the metal-containing absorption lines seen in quasar spectra which have Z(abs) < < Z(em). These systems, which probably originate in the halos of galaxies at high redshift, are then compared to observations of the halo and interstellar medium of the Milky Way. We obtained echelle spectra at the Multiple Mirror Telescope (MMT) of the Z = 1.79 absorption system of the quasar B2 1225+317. The velocity profiles showed complex structure which varied from ion to ion, with ionization and column densities varying from component to component. The relati

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17

Rojas, Randall R. "Photometric and spectroscopic properties of void galaxies in the Sloan Digital Sky Survey /." Click for resource, 2004. http://dspace.library.drexel.edu/handle/1860/270.

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18

MacQueen, Phillip J. "Solid-state image detector development : a linear diode array for astronomical spectroscopy." Thesis, University of Canterbury. Astronomy, 1986. http://hdl.handle.net/10092/8071.

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Future spectroscopic observational programmes at Mount John University Observatory require the ability to acquire spectra with significantly higher spectrophotometric accuracy and geometrical stability than can currently be achieved. Therefore a solid-state linear-diode-array image detector system has been designed and developed for use with the MJUO échelle spectrograph. A review of those electromechanical design techniques of significance to astronomical instrumentation is presented. Their application is exemplified with a complete electromechanical design for the detector, which is found t

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19

Ren, Deqing. "New techniques of multiple integral field spectroscopy." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3800/.

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The work of this thesis is to investigate new techniques for Integral Field Spectroscopy (IPS) to make the most efficient use of modem large telescopes. Most of the work described is aimed at the FMOS for the SUBARU 8m telescope. Although this is primarily a system for Multiple Object Spectroscopy (MOS) employing single fibres, there is an option to include a multiple-IFS (MIPS) system. Much of this thesis is therefore aimed at the design and prototyping of critical systems for both the IPS and MOS modes of this instrument. The basic theory of IFU design is discussed first. Some particular pro

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20

Chan, Yat-ping Carl, and 陳一平. "Installation of direct-vision prism spectroscopy into a 32CM cassegrain telescope." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31220472.

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21

Chan, Yat-ping Carl. "Installation of direct-vision prism spectroscopy into a 32CM cassegrain telescope /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20357680.

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22

Jones, Scott Curtis, and University of Lethbridge Faculty of Arts and Science. "Astronomical submillimetre Fourier transform spectroscopy from the Herschel Space Observatory and the JCMT." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Physics & Astronomy, c2010, 2010. http://hdl.handle.net/10133/2486.

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Fourier transform spectroscopy (FTS) is one of the premier ways to collect source information through emitted radiation. It is so named because the principal measurement technique involves the analysis of spectra determined from the Fourier transform of a time-domain interference pattern. Given options in the field, many space- and ground-based instruments have selected Fourier transform spectrometers for their measurements. The Herschel Space Observatory, launched on May 14, 2009, has three on-board instruments. One, SPIRE, comprises a FTS paired with bolometer detector arrays. SCUBA-2

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23

Larson, Ana Marie. "A study of high quality, near-infrared spectra of eight spectral type of K stars: precise radial velocities, chromospheric emission, and fundamental stellar parameters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21938.pdf.

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24

Ogden, Chad E. "A prototype visible to near-infrared spectrograph for the CHARA array a long-baseline stellar interferometer /." unrestricted, 2005. http://etd.gsu.edu/theses/available/etd-11282005-121433/.

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Thesis (Ph. D.)--Georgia State University, 2005.<br>Theo A. ten Brummelaar, committee chair; Brian D. Thoms, Todd J. Henry, William G. Bagnuolo, Douglas R. Gies, Harold A. McAlister, committee members. Author's name from thesis t.p. Electronic text (548 p. : ill.) : digital, PDF file. Description based on contents viewed June 27, 2007; title from title screen. Includes bibliographical references (p. 539-548).

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25

Faloon, Ashley J. 1983. "A spectroscopic survey of the supercluster RCS2319+00 /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111567.

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This thesis presents the results of a spectroscopic survey of the RCS2319+00 supercluster field using the VIMOS instrument on the 8-meter Very Large Telescope. This system is a rare and massive high-redshift structure, comprising at least three galaxy clusters at z = 0.9, separated by less than 3 Mpc, and is one of the few examples of the progenitors of present-day massive galaxy clusters.<br>We measure 638 new redshifts from a sample of 1134 target sources, 49 of which are consistent with the supercluster redshift. Redshifts are also obtained for 24 radio galaxies within the field, with 6 of

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26

O'Donnell, D. V. (Daniel V. ). 1983. "An infrared survey of galaxy clusters with the Spitzer Space Telescope /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111564.

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We present the observations, reduction and preliminary analysis of a sample of 45 mid-to-high redshift galaxy clusters imaged with the Spitzer Space Telescope's MIPS camera at 24 ~m and selected from the Red Sequence Cluster Survey. The purpose of the data set is motivated by a broad review of studies into the evolutionary trends of galaxy clusters and their constituent galaxy populations, focusing specifically on recent results that indicate clusters are environmental drivers of dusty starburst and active galactic nuclei activity. To accommodate the large amount of data in hand, we have const

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27

Mu, Bo. "Unsupervised spectral classification of astronomical X-ray sources based on independent component analysis /." Online version of thesis, 2007. http://hdl.handle.net/1850/5870.

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28

PENNING, WILLIAM ROY. "INVESTIGATIONS OF LONG-PERIOD DQ HERCULIS STARS." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/188161.

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The magnetic rotator model has long been the favored explanation for coherent photometric modulations in the DQ Herculis class of cataclysmic variables. However, to date, all evidence supporting this model has been of the indirect variety. Unlike their synchronously rotating cousins, the AM Herculis objects, DQ Herculis stars have not yet been discovered to emit polarized radiation. Therefore, in light of this crucial lack, the evidence used to place these objects in the magnetic cataclysmic variable category has been strictly circumstantial, based primarily on the coherence of the photometric

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29

Jeffers, Sandra Victoria. "Surface brightness distributions of late-type stars." Thesis, University of St Andrews, 2005. http://hdl.handle.net/10023/12941.

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The aim of this work has been to increase our understanding of the surface brightness distributions of late-type stars through Doppler imaging and eclipse mapping techniques. Combining spectroscopic and photometric observations with the technique of Doppler Imaging, I have reconstructed surface images of the G2V star He 699 (for 08 October 2000), which show high latitude and polar structures. In the case of the KOV star AB Dor, the Doppler images for January 1992 and November 1993 show a large polar cap with small dark features also present at intermediate to high latitudes. As the phase sampl

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30

Hernandez, Eloy [Verfasser], Martin M. [Akademischer Betreuer] Roth, Klaus [Akademischer Betreuer] Petermann, and Andreas [Akademischer Betreuer] Kelz. "Numerical simulations in multimode fibres for astronomical spectroscopy / Eloy Luis Hernandez Anguizola ; Martin M. Roth, Klaus Petermann, Andreas Kelz." Potsdam : Universität Potsdam, 2020. http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-472363.

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31

Hernandez, Eloy [Verfasser], Martin M. Akademischer Betreuer] Roth, Klaus [Akademischer Betreuer] [Petermann, and Andreas [Akademischer Betreuer] Kelz. "Numerical simulations in multimode fibres for astronomical spectroscopy / Eloy Luis Hernandez Anguizola ; Martin M. Roth, Klaus Petermann, Andreas Kelz." Potsdam : Universität Potsdam, 2020. http://d-nb.info/1219579300/34.

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32

Hernandez, Anguizola Eloy Luis [Verfasser], Martin M. [Akademischer Betreuer] Roth, Klaus [Akademischer Betreuer] Petermann, and Andreas [Akademischer Betreuer] Kelz. "Numerical simulations in multimode fibres for astronomical spectroscopy / Eloy Luis Hernandez Anguizola ; Martin M. Roth, Klaus Petermann, Andreas Kelz." Potsdam : Universität Potsdam, 2020. http://d-nb.info/1219579300/34.

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33

Chantzos, Johanna [Verfasser], and Paola [Akademischer Betreuer] Caselli. "High resolution spectroscopy of molecules of astrophysical interest and radio astronomical observations of star forming regions / Johanna Chantzos ; Betreuer: Paola Caselli." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1209472864/34.

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34

Leigh, Christopher. "The detection and characterisation of extrasolar planets." Thesis, University of St Andrews, 2004. http://hdl.handle.net/10023/12943.

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Abstract (sommario):

Since the discovery of 51 Pegasi b in 1995, continued observations have indirectly identified over 110 planetary objects. These Jupiter-mass objects cause their host star to "wobble" slightly about the common centre-of-mass of the system, which is detectable as radial motion in high-precision Doppler spectroscopy. Of the known planets, approximately 20% are found to orbit within 0.1 AU of the star, whilst the transit of HD209458 has inferred the gas-giant nature of these close-in extrasolar giant planets (CEGPs). The discovery of CEGPs has produced a wave of speculative theory as to the exact

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35

Neyskens, Pieter. "Exploring S stars: stellar parameters, abundances and constraints on the s-process from a new grid of model atmospheres." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209358.

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More than 80% of the stars in the Universe are expected to have initial masses below eight to ten times the mass of our sun. These low mass stars, including our sun, become cool red giants during one of the final evolutionary stages of their life: the Asymptotic Giant Branch (or AGB) phase. AGB stars are among the main producers of carbon and heavy (s-process) elements in the Universe. These elements are synthesized inside the star and mixed to the stellar atmosphere where stellar winds are responsible for the loss of more than 50% of the stellar mass, hence, AGB stars are strong polluters of

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36

Spencer, Locke Dean, and University of Lethbridge Faculty of Arts and Science. "Spectral characterization of the Herschel SPIRE photometer." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2005, 2005. http://hdl.handle.net/10133/291.

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The European Space Agency's Herschel Space Observatory is comprised of three cryogenically cooled instruments commissioned to explore the far infrared/submillimetre universe. The Spectral and Photometric Imaging REceiver (SPIRE) is one of Herschel's instruments and consists of a three band imaging photometer and a two band imaging spectrometer. Canada is involved in the SPIRE project through provision of instrument development hardware and software, mission flight software, and support personnel. This thesis discusses Fourier transform spectroscopy (FTS) and FTS data processing. A detailed dis

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37

Tyas, Luke Martin Graham. "The SALT HRS Spectrograph." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/3492/.

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SALT HRS (Southern African Large Telescope High Resolution Échelle Spectrograph) is a high-resolution, high-efficiency spectrograph for the 11m SALT telescope in Sutherland, South Africa. The initial optical design work was performed at the University of Canterbury, New Zealand. Revisions to the concept, the mechanical design, manufacture, assembly and testing have been handled by the Centre for Advanced Instrumentation, at Durham University in the United Kingdom. SALT HRS is a fibre-fed echelle grating spectrograph with four operational modes: low-, medium- and high-resolution and high-stabi

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38

Marchi, Magali Conceição de Barros de. "A contribuição de Annie Jump Cannon para a Classificação Espectral de Harvard." Pontifícia Universidade Católica de São Paulo, 2017. https://tede2.pucsp.br/handle/handle/20080.

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Submitted by Filipe dos Santos (fsantos@pucsp.br) on 2017-05-12T13:15:30Z No. of bitstreams: 1 Magali Conceição de Barros de Marchi.pdf: 3776158 bytes, checksum: 69bb899a4464db6873c96be97e829f2e (MD5)<br>Made available in DSpace on 2017-05-12T13:15:30Z (GMT). No. of bitstreams: 1 Magali Conceição de Barros de Marchi.pdf: 3776158 bytes, checksum: 69bb899a4464db6873c96be97e829f2e (MD5) Previous issue date: 2017-03-13<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Fundação São Paulo - FUNDASP<br>At the end of the 19thand beginning of the 20th there was a technolog

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39

Casamiquela, Floriach Laia. "Chemical and dynamical analysis of Open Clusters in the context of the Milky Way disc." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/459148.

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This thesis has as a main purpose the determination of the chemical composition of Open Clusters for the study of the chemical gradients in the Galactic disc with: Galactocentric radius, position above the plane, and age. In 3 years and a half we have acquired high-resolution spectra of stars in 18 Open Clusters as a part of the OCCASO survey. We have used three fiber fed high-resolution spectrographs in the Observatorio del Roque de los Muchachos (La Palma, Spain) and the CAHA observatory (Almería, Spain). After a very accurate data reduction we have determined radial velocities, atmospher

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40

Daigle, Olivier. "Spectro-imagerie optique à faible flux et comparaison de la cinématique Hα et HI d'un échantillon de galaxies proches". Aix-Marseille 1, 2010. http://www.theses.fr/2010AIX10141.

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Un nouveau contrôleur de EMCCD (Electron multiplying Charge Coupled Device) est présenté. Il permet de diminuer significativement le bruit qui domine lorsque la puce EMCCD est utilisé pour du comptage de photons: le bruit d'injection de charge. À l'aide de ce contrôleur, une caméra EMCCD scientifique a été construite, caractérisée en laboratoire et testée à l'observatoire du mont Mégantic. Cette nouvelle caméra permet, entre autres, de réaliser des observations de la cinématique des galaxies par spectroscopie de champ intégral par interférométrie de Fabry-Perot en lumière Ha beaucoup plus rapi

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41

Fanelli, Cristiano <1991&gt. "Unveiling the unknown of cool stars with high-resolution spectroscopy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10440/1/CristianoFanelli_tesi.pdf.

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Cool giant and supergiant stars are among the brightest populations in any stellar system and they are easily observable out to large distances, especially at infrared wavelengths. These stars also dominate the integrated light of star clusters in a wide range of ages, making them powerful tracers of stellar populations in more distant galaxies. High-resolution near-IR spectroscopy is a key tool for quantitatively investigating their kinematic, evolutionary and chemical properties. However, the systematic exploration and calibration of the NIR spectral diagnostics to study these cool stellar

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42

Lardo, Carmela <1984&gt. "Multiple stellar populations in globular clusters with photometry and low resolution spectroscopy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5204/1/carmela_lardo_tesi.pdf.

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Our view of Globular Clusters has deeply changed in the last decade. Modern spectroscopic and photometric data have conclusively established that globulars are neither coeval nor monometallic, reopening the issue of the formation of such systems. Their formation is now schematized as a two-step process, during which the polluted matter from the more massive stars of a first generation gives birth, in the cluster innermost regions, to a second generation of stars with the characteristic signature of fully CNO-processed matter. To date, star-to-star variations in abundances of the light

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43

Lardo, Carmela <1984&gt. "Multiple stellar populations in globular clusters with photometry and low resolution spectroscopy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5204/.

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Abstract (sommario):

Our view of Globular Clusters has deeply changed in the last decade. Modern spectroscopic and photometric data have conclusively established that globulars are neither coeval nor monometallic, reopening the issue of the formation of such systems. Their formation is now schematized as a two-step process, during which the polluted matter from the more massive stars of a first generation gives birth, in the cluster innermost regions, to a second generation of stars with the characteristic signature of fully CNO-processed matter. To date, star-to-star variations in abundances of the light

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44

Mingozzi, Matilde <1992&gt. "Exploring interstellar medium conditions in AGN and star forming galaxies with integral field spectroscopy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9461/1/thesis_final_mingozzi.pdf.

Testo completo

Abstract (sommario):

The interstellar medium (ISM), made up of ionised, neutral and molecular gas, and interstellar dust, is a fundamental ingredient of galaxy evolution. It is the “primary repository” of galaxies, where star formation (SF) takes place, depositing energy, momentum and chemical enriched material via stellar evolution events (e.g. stellar winds, supernova explosions). ISM properties can be largely influenced also by Active Galactic Nuclei (AGN) activity, that through outflows and jets is capable of heating, compressing and/or removing the gas (feedback). SF and AGN activities are part of the so-call

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45

Torresi, Eleonora <1981&gt. "The gaseous environment of radio galaxies: a new perspective from high-resolution x-ray spectroscopy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3820/1/Torresi_Eleonora_tesi.pdf.

Testo completo

Abstract (sommario):

It is known that massive black holes have a profound effect on the evolution of galaxies, and possibly on their formation by regulating the amount of gas available for the star formation. However, how black hole and galaxies communicate is still an open problem, depending on how much of the energy released interacts with the circumnuclear matter. In the last years, most studies of feedback have primarily focused on AGN jet/cavity systems in the most massive galaxy clusters. This thesis intends to investigate the feedback phenomena in radio--loud AGNs from a different perspective studying

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46

Torresi, Eleonora <1981&gt. "The gaseous environment of radio galaxies: a new perspective from high-resolution x-ray spectroscopy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3820/.

Testo completo

Abstract (sommario):

It is known that massive black holes have a profound effect on the evolution of galaxies, and possibly on their formation by regulating the amount of gas available for the star formation. However, how black hole and galaxies communicate is still an open problem, depending on how much of the energy released interacts with the circumnuclear matter. In the last years, most studies of feedback have primarily focused on AGN jet/cavity systems in the most massive galaxy clusters. This thesis intends to investigate the feedback phenomena in radio--loud AGNs from a different perspective studying

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47

Tombesi, Francesco <1982&gt. "An X-ray absorption line spectroscopy study of ultra-fast outflows from the innermost regions of AGNs." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2548/1/tombesi_francesco_tesi.pdf.

Testo completo

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48

Tombesi, Francesco <1982&gt. "An X-ray absorption line spectroscopy study of ultra-fast outflows from the innermost regions of AGNs." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2548/.

Testo completo

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49

Cocozza, Gabriele <1974&gt. "A spectroscopic and photometric study of MSP companions in Galactic Globular Clusters." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/631/1/Tesi_Cocozza_Gabriele.pdf.

Testo completo

Abstract (sommario):

This Thesis is devoted to the study of the optical companions of Millisecond Pulsars in Galactic Globular Clusters (GCs) as a part of a large project started at the Department of Astronomy of the Bologna University, in collaboration with other institutions (Astronomical Observatory of Cagliari and Bologna, University of Virginia), specifically dedicated to the study of the environmental effects on passive stellar evolution in galactic GCs. Globular Clusters are very efficient “Kilns” for generating exotic object, such as Millisecond Pulsars (MSP), low mass X-ray binaries(LMXB) or Blue S

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50

Cocozza, Gabriele <1974&gt. "A spectroscopic and photometric study of MSP companions in Galactic Globular Clusters." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/631/.

Testo completo

Abstract (sommario):

This Thesis is devoted to the study of the optical companions of Millisecond Pulsars in Galactic Globular Clusters (GCs) as a part of a large project started at the Department of Astronomy of the Bologna University, in collaboration with other institutions (Astronomical Observatory of Cagliari and Bologna, University of Virginia), specifically dedicated to the study of the environmental effects on passive stellar evolution in galactic GCs. Globular Clusters are very efficient “Kilns” for generating exotic object, such as Millisecond Pulsars (MSP), low mass X-ray binaries(LMXB) or Blue S

Gli stili APA, Harvard, Vancouver, ISO e altri

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