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Now showing items 81-90 of 178
The cosmic evolution of the IMF under the Jeans conjecture with implications for massive galaxies
(Oxford University Press, 2013)
We examine the cosmic evolution of a stellar initial mass function (IMF) in galaxies that varies
with the Jeans mass in the interstellar medium, paying particular attention to the K-band stellar
mass-to-light ratio (M/LK) ...
The slow flow model of dust eflux in local star-forming galaxies
(Oxford University Press, 2013)
We develop a dust efflux model of radiation pressure acting on dust grains which
successfully reproduces the relation between stellar mass, dust opacity and star forma-
tion rate observed in local star-forming galaxies. ...
The high-ion content and kinematics of low-redshift lyman limit systems
(The American Astronomical Society, 2013)
We study the high-ion content and kinematics of the circumgalactic medium around low-redshift galaxies using a sample of 23 Lyman limit systems (LLSs) at 0.08 < z < 0.93 observed with the Cosmic Origins Spectrograph on ...
Testing gravity using large-scale redshift-space distortions
(Oxford University Press, 2013)
We use luminous red galaxies from the Sloan Digital Sky Survey (SDSS) II to test
the cosmological structure growth in two alternatives to the standard cold dark matter
( CDM)+general relativity (GR) cosmological model. ...
Radio-loud active calactic nucleus: is there a link between luminosity and cluster environment?
(American Physical Society, 2013)
We present here the first results from the Chandra ERA (Environments of Radio-loud AGN) Large Project,
characterizing the cluster environments of a sample of 26 radio-loud active galactic nuclei (AGNs) at z ∼ 0.5
that ...
Sample variance, source clustering and their influence on the counts of faint radio sources
(Oxford University Press, 2013)
The shape of the curves defined by the counts of radio sources per unit area as a function of their
flux density was one of the earliest cosmological probes. Radio source counts continue to be
an area of astrophysical ...
Testing homegeneity with Galaxy Star formation histories
(IOP Publishing, 2013)
Observationally confirming spatial homogeneity on sufficiently large cosmological scales is of importance to test
one of the underpinning assumptions of cosmology, and is also imperative for correctly interpreting dark ...
Students' ontological security and agency in science education - an example from reasoning about the use of gene technology
(Taylor & Francis, 2013)
This paper reports on a study of how students' reasoning about socioscientific issues is framed by three dynamics: societal structures, agency and how trust and security issues are handled. Examples from gene technology ...
The ongoing pursuit of R Coronae Borealis stars: the ASAS-3 survey strikes again
(EDP Sciences, 2013)
CONTEXT: R Coronae Borealis stars( RCBs) are rare, hydrogen-deficient, carbon rich super giant variable stars that are likely the evolved merger products of pairs of CO and He white dwarfs. Only 55 RCB stars have been found ...
Properties of Type Ia supernovae inside rich galaxy clusters
(Oxford University Press, 2013)
We used the Gaussian Mixture Brightest Cluster Galaxy catalogue and Sloan Digital Sky
Survey-II supernovae data with redshifts measured by the Baryon Oscillation Spectroscopic
Survey to identify 48 Type Ia supernovae ...