Beecroft Institute for Particle Astrophysics and Cosmology

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Non-Standard Structure Formation Scenarios

(2002)

Authors:

Alexander Knebe, Brett Little, Ranty Islam, Julien Devriendt, Asim Mahmood, Joe Silk
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White dwarfs in the 2dF QSO redshift survey - I. Hydrogen-rich (DA) stars

Monthly Notices of the Royal Astronomical Society 335:3 (2002) 673-686

Authors:

S Vennes, RJ Smith, BJ Boyle, SM Croom, A Kawka, T Shanks, L Miller, N Loaring

Abstract:

We report the spectroscopic identification of close to 1000 hydrogen-rich (DA) white dwarfs discovered in the course of the Anglo-Australian 2dF QSO Redshift Survey (2QZ). We measured the atmospheric parameters of a subsample of 201 stars based on good-quality Balmer line spectra and we determine the 2QZ population characteristics. Over ten per cent of the sample are potential ZZ Ceti variables. We estimate the DA white dwarf birthrate (bDA = 0.5-1.0 × 10-12 yr-1 pc-3) and the scaleheight (h = 220-300 pc) of the population in the thin disc of the Galaxy by combining information acquired in the Palomar-Green, AAT-UVX and new 2QZ surveys. White dwarfs appear related to G and late-F progenitors. A catalogue of 201 DA white dwarfs is presented.
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The correlation of line strength with luminosity and redshift from composite QSO spectra

ArXiv astro-ph/0207571 (2002)

Authors:

SM Croom, K Rhook, EA Corbett, BJ Boyle, H Netzer, NS Loaring, L Miller, PJ Outram, T Shanks, RJ Smith

Abstract:

We have generated a series of composite QSO spectra using over 22000 individual low resolution (~8A) QSO spectra obtained from the 2dF (18.25
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The shape of a small universe: signatures in the cosmic microwave background

(2002)

Authors:

R Bowen, PG Ferreira
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The shape of a small universe: signatures in the cosmic microwave background

ArXiv astro-ph/0207505 (2002)

Authors:

R Bowen, PG Ferreira

Abstract:

We consider the most general parametrization of flat topologically compact universes, complementing the work of Scannapieco, Levin and Silk to include non-trivial shapes. We find that modifications in shape of the fundamental domain will lead to distinct signatures in the anisotropy of the cosmic microwave radiation. We make a preliminary assessment of the effect on three statistics: the angular power spectrum, the distribution of identified ``circles'' on the surface of last scattering and the correlation function of antipodal points.
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