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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
611

Abundance Matching with the Galaxies of the Virgo Cluster and the Stellar-to-Halo Mass Relation

Grossauer, Jonathan January 2012 (has links)
Using data from the Next Generation Virgo Cluster Survey and high-resolution simulations of Virgo cluster-like halos, we determine the stellar-to-halo mass relation (SHMR) for subhalos, using the technique of abundance matching. The subhalo SHMR differs markedly from its field galaxy counterpart, regardless of how the subhalo mass is defined (mass at z = 0, mass at infall, or maximum mass while in the field). The slope of the relation at low mass (M⋆<10^10 Msun) is in all cases steeper than the same for the field. We find conflicting indicators of whether this difference in slope indicates an increasing or decreasing dark-to-stellar ratio; further modelling is required to reach a definitive conclusion. We also find evidence for the existence of a measurable age gradient in velocity, such that older subhalos have lower velocities than their younger peers. This opens the possibility that good quality redshifts of the lower mass galaxies of the Virgo cluster might provide additional constraints on the SHMR at high redshift and its evolution. Finally, we investigate the degree to which mergers, particularly major mergers, cause mixing of old and new material in halos, which has implications for the robustness of any implied radial age gradient. We find only a slight increase in mixing for major mergers over minor mergers, and little evidence for any large amount of mixing being induced by mergers of any ratio.
612

The nature of luminous IRAS galaxies

DePoy, Darren Lee January 1987 (has links)
Typescript. / Includes bibliographies. / Photocopy. / Microfilm. / xi, 175 leaves, bound ill. 29 cm
613

Imaging of complete samples of Z tilde 1 3C sources / Imaging of complete samples of redshift of approximately one 3C sources

Ridgway, Susan E January 1995 (has links)
Scientific symbol in title. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1995. / Includes bibliographical references (leaves 118-124). / Microfiche. / xi, 124 leaves, bound ill. 29 cm
614

Signatures of the propagation of primary and secondary cosmic ray electrons and positrons in the galaxy / Troy Anthony Porter.

Porter, Troy Anthony January 1999 (has links)
Includes bibliographical references (8 p.) / ix, 173, [8] p. : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Examines some of the consequences of the acceleration and production, and propagation, of high energy electrons and positrons in the Galaxy. In particular, predictions are made of the diffuse photon signals arising from the interactions of electrons and positrons with gas, low energy photons, and the galactic magnetic field during their transport in the Galaxy. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1999
615

Protogalaxy formation from inhomogeneities in cosmological models

Rankin, John Robert January 1977 (has links)
xii, 218 leaves / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1978) from the Dept. of Mathematical Physics, University of Adelaide
616

Signatures of the propagation of primary and secondary cosmic ray electrons and positrons in the galaxy / Troy Anthony Porter.

Porter, Troy Anthony January 1999 (has links)
Includes bibliographical references (8 p.) / ix, 173, [8] p. : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Examines some of the consequences of the acceleration and production, and propagation, of high energy electrons and positrons in the Galaxy. In particular, predictions are made of the diffuse photon signals arising from the interactions of electrons and positrons with gas, low energy photons, and the galactic magnetic field during their transport in the Galaxy. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1999
617

The metallicity distribution function of globular clusters systems through near-infrared photometry

Okoń, Wademar M. M. Harris, W. E. January 1900 (has links)
Thesis (Ph. D.)--McMaster University, 2006. / Supervisor: William E. Harris.
618

The galactic globular cluster NGC 3201: Primordial binaries and tidal dynamics.

Cote, Patrick. Welch, D.L. Unknown Date (has links)
Thesis (Ph.D.)--McMaster University (Canada), 1994. / Source: Dissertation Abstracts International, Volume: 58-06, Section: B, page: 3088. Adviser: D. L. Welch.
619

The formation of molecular clouds in spiral galaxies /

Dobbs, Clare Louise. January 2007 (has links)
Thesis (Ph.D.) - University of St Andrews, March 2007.
620

Measuring mass non-circular motions of gas in disk galaxies and radial velocities of stars in a global cluster /

Sánchez, Ricardo Zánmar, January 2009 (has links)
Thesis (Ph. D.)--Rutgers University, 2009. / "Graduate Program in Physics and Astronomy." Includes bibliographical references.

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