A deep, narrow J-band search for proto-galactic Lyman Alpha emission at redshifts z~9

We present a deep, narrow J-band search for proto--galactic Lyman Alpha emission at redshifts z~9. We combine an exceptionally deep image of the Hubble Deep Field South, obtained using a narrow band filter centred on the wavelength 1.187 microns using the VLT/ISAAC facility, with existing deep, broad band images covering optical to near infrared wavelengths. We search for z~9 Lyman Alpha emitting galaxies displaying a significant narrow band excess relative to the Js-band that are undetected at optical wavelengths. We detect no sources consistent with this criterion to the 90% point source flux limit of the NB image, F_{NB} = 3.28 x 10^{-18} ergs/s/cm2. The survey selection function indicates that we have sampled a volume of approximately 340 h^{-3} Mpc^3 to a Lyman Alpha emission luminosity of 10^{43} h^{-2} ergs/s. We conclude by considering the potential implications for the physics of the high--redshift universe.Comment: 11 pages, accepted MNRAS. Please note that the automatic postscript generation may result in a corrupted postscript file. Please use ftp://astroftp.phys.uvic.ca/pub/jwillis/jwillis_zen1.ps.gz to obtain an uncorrupted versio

What's up prof? Current issues in the visual effects & post-production industry

We interviewed creative professionals at a number of London visual effects and post-production houses. We report on the key issues raised in those interviews: desirable new technologies, infrastructure challenges, personnel and process management

Shape Morphing Using PDE Surfaces

NoA methodology for shape morphing using partial differential equation (PDE) surfaces is presented in this work. The use of the PDE formulation shows how shape morphing can be based on a boundary-value approach by which intermediate shapes can be created. Furthermore, the mathematical properties of the method give rise to several alternatives in which morphing one shape into another can be achieved. Three of these alternatives are presented here. The first one is based on the gradual variation of the weighted sum of the boundary conditions for each surface, the second one consists of varying the Fourier mode for which the PDE is solved whilst the third results from a combination of the first two. Examples showing the efficiency of these methodologies are presented. Thus, it is shown that the PDE based approach for morphing, when combined with a parametric variation of the boundary conditions, is capable of obtaining smooth intermediate surfaces automatically

A deep, narrow J-band search for protogalactic Lyα emission at redshifts z ∼ 9

We present a deep, narrow J-band search for protogalactic Lyα emission at redshifts z∼ 9. We combine an exceptionally deep image of the Hubble Deep Field South, obtained using a narrow-band filter centred on the wavelength 1.187 μm using the VLT/ISAAC facility, with existing deep, broad-band images covering optical to near-infrared wavelengths. We search for z∼ 9 Lyα-emitting galaxies displaying a significant narrow-band excess relative to the Js band that are undetected at optical wavelengths. We detect no sources consistent with this criterion to the 90 per cent point-source flux limit of the narrow-band image, FNB= 3.28 × 10−18 erg s−1 cm−2. The survey selection function indicates that we have sampled a volume of approximately 340 h−3 Mpc3 to a Lyα emission luminosity of 1043 h−2 erg s−1. We conclude by considering the potential implications for the physics of the high-redshift Univers

Chemical Bonding Technology: Direct Investigation of Interfacial Bonds

This is the third Flat-Plate Solar Array (FSA) Project document reporting on chemical bonding technology for terrestrial photovoltaic (PV) modules. The impetus for this work originated in the late 1970s when PV modules employing silicone encapsulation materials were undergoing delamination during outdoor exposure. At that time, manufacturers were not employing adhesion promoters and, hence, module interfaces in common with the silicone materials were only in physical contact and therefore easily prone to separation if, for example, water were to penetrate to the interfaces. Delamination with silicone materials virtually vanished when adhesion promoters, recommended by silicone manufacturers, were used. The activities related to the direct investigation of chemically bonded interfaces are described

Luminous early-type field galaxies at z∼0.4z \sim 0.4 - I. Observations and redshift catalogue of 581 galaxies

We have compiled a sample of $\sim 9600$ bright, $i\le 18.95$, red, $b_j-r>2$, candidate galaxies in an area of 220 deg$^2$. These are luminous, $L > L^*$, field early-type galaxies with redshifts 0.3 \la z \la 0.6. We present a redshift catalogue of a sub-sample of 581 targets. The galaxies were selected according to their broadband $b_jri$ colours from United Kingdom Schmidt Telescope plates, and have a surface density on the sky of only $\sim 50$deg$^{-2}$. Such luminous field galaxies are virtually absent from published redshift surveys and the catalogue provides a large sample of the most luminous normal galaxies, at cosmological distances. The statistical properties of the galaxy spectra, including absorption line and emission line measures, are presented and a composite spectrum constructed. The nature of the sample, combined with the relatively bright apparent magnitudes make the galaxies suitable targets for several key investigations in galaxy evolution and cosmology.Comment: 16 pages, 20 figures, landscape table attached, accepted for publication by MNRAS. Contains mn.st

ZEN2: a narrow J-band search for z∼ 9 Lyα emitting galaxies directed towards three lensing clusters

We present the results of a continuing survey to detect Lyα emitting galaxies at redshifts z∼ 9: the ‘z equals nine' (ZEN) survey. We have obtained deep VLT Infrared Spectrometer and Array Camera observations in the narrow J-band filter NB119 directed towards three massive lensing clusters: Abell clusters 1689, 1835 and 114. The foreground clusters provide a magnified view of the distant Universe and permit a sensitive test for the presence of very high redshift galaxies. We search for z∼ 9 Lyα emitting galaxies displaying a significant narrow-band excess relative to accompanying J-band observations that remain undetected in Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) optical images of each field. No sources consistent with this criterion are detected above the unlensed 90 per cent point-source flux limit of the narrow-band image, FNB= 3.7 × 10−18erg s−1cm−2. To date, the total coverage of the ZEN survey has sampled a volume at z∼ 9 of approximately 1700 comoving Mpc3 to a Lyα emission luminosity of 1043erg s−1. We conclude by considering the prospects for detecting z∼ 9 Lyα emitting galaxies in light of both observed galaxy properties at z

Glucose-6-phosphate dehydrogenase activity of Neurospora grown on media containing malonate and citrate

Glucose-6-phosphate dehydrogenase activity om malonate and citrat