Cosmology

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The frequency of barred spiral galaxies in the near-infrared

ASTRONOMICAL JOURNAL 119:2 (2000) 536-544

Authors:

PB Eskridge, JA Frogel, RW Pogge, AC Quillen, RL Davies, DL DePoy, ML Houdashelt, LE Kuchinski, SV Ram铆rez, K Sellgren, DM Terndrup, GP Tiede

The hyperluminous infrared quasar 3C 318 and its implications for interpreting submm detections of high-redshift radio galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 313:2 (2000) 237-246

Authors:

CJ Willott, S Rawlings, MJ Jarvis

Monitoring of laser guide star & light pollution

Proceedings of SPIE - The International Society for Optical Engineering 3763 (1999) 50-60

Authors:

N Ageorges, F Delplancke, N Hubin, R Davies

Abstract:

The optical backscatter of the 4W CW laser used to produce a mesospheric sodium-layer laser guide star for the MPE adaptive optics system (ALFA) has been observed from a neighbouring 2.2 m telescope. The observations, taken at the Max Planck Observatory in Calar-Alto (Spain), in August 1998, had two aims: study the Na plume (altitude and profile variations) and the Rayleigh cone to achieve Rayleigh scattering measurements. In the framework of the network, 'Laser Guide Star for 8m class telescopes', a program of the European Commission, ESO, MPE and NUI, Galway are collaborating on studying the light pollution due to the MPE ALFA laser. The light pollution of the observatory is due to Rayleigh and Mie scattering, including water scattering, of the laser beam in the low atmosphere. With the increase of Laser Guide Star Adaptive Optics system use, there is a need for a laser management policy. In order to optimise observing time, it is important to evaluate exactly when to stop the LGS, as the line of sight of one telescope gets near the laser beam, and as a function of other telescope observing programme. In this perspective, not only the single and multiple Rayleigh scattering by atmospheric molecules but also Mie scattering by aerosols has to be taken into account. Modeling of these phenomena needs an experimental calibration in realistic circumstances, and precise measurements of single and multiple light scattering in the surroundings of the beam at various altitudes. We report here on the result of such experiments.

The spectral appearance of primeval galaxies

(1999)

Authors:

B Guiderdoni, JEG Devriendt

A survey of UV-excess AGNs in the South Galactic Pole

ArXiv astro-ph/9910055 (1999)

Authors:

F La Franca, C Lissandrini, S Cristiani, L Miller, MRS Hawkins, HT McGillivray

Abstract:

Spectra, position, magnitudes and colors are presented for 485 faint (B<20.5) emission line objects selected with the ultraviolet-excess (UVX) criterion on a area of 24.6 sq. deg in the South Galactic Pole. The objects were selected from the analysis of pixel-to-pixel stacking of COSMOS scans of UKST U, J and R plates. The candidates were observed with the Meudon-ESO Fiber Optics System (MEFOS) at the ESO 3.6m telescope. 429 type 1 AGNs have been identified (373 in the redshift range 0.3