Showing papers by "Peter A. R. Ade published in 1986"
TL;DR: In this paper, narrowband photometry of the Jovian disk in 10 passbands covering the range from 0.35 to 3.3 mm wavelength was reported. But the results for wavelengths between 0.45 mm and 0.7 mm were not fit by a clear atmosphere (or a small particle cloud) model.
100 citations
TL;DR: In this paper, narrowband photometric measurements of Uranus and Neptune covering the wavelength range from 0.35 to 3.3 mm were made and combined with other measurements made in the period 1978 through 1984 in the spectral range of 17 μm through 3 mm to form models for atmospheric temperature structure in the vertical range from 100 mbar to 8 bar.
87 citations
TL;DR: The results of monitoring, over a period of two years, a sample of 12 blazars in 11 wave bands between 1 micron and 2 mm are presented in this article.
Abstract: The results of monitoring, over a period of two years, a sample of 12 blazars, in 11 wave bands between 1 micron and 2 mm are presented All sources exhibit some variability, both in flux density and spectral shape The infrared variability is consistent with repeated injections of reaccelerations of electrons, which subsequently suffer radiative losses For OJ 287, 3C 279, and 3C 345, a decay and steepening of the infrared spectrum occurred as the submillimeter turnover evolved to lower frequencies, consistent with expansion of the emitting region The peak flux, however, increased during this evolution This behavior is inconsistent with most models for compact extragalactic sources, but it is naturally explained by shock waves traveling in an adiabatically expanding relativistic jet (Marscher and Gear, 1985)
28 citations
01 May 1986
TL;DR: In this paper, a spectroscopic instrument for the ESA Infrared Space Observatory is described, covering the wavelength range 45 to 180 microns and with operating modes offering a choice of two resolving powers.
Abstract: A spectroscopic instrument for the ESA Infrared Space Observatory is described, covering the wavelength range 45 to 180 microns and with operating modes offering a choice of two resolving powers. The lower resolving power of around 230 is given by a diffraction grating system, with the spectrum recorded by a line of 10 detectors. The high resolving power of around 1.5E4 is achieved by switching a Fabry-Perot (F-P) interferometer into the parallel part of the instrument beam. Either of two F-Ps can be selected, one optimised for the 45 to 90 micron wavelength range and the other for 90 to 180 microns. The operating modes offered include differential measurement, using wavelength switching and synchronous detection, and absolute measurement with an internal chopper/reference. Development aspects of the instrument are also discussed.
17 citations
TL;DR: In this paper, the authors have mapped the 350-μm emission along the major axis of the dusty galaxy NGC 253 and find this to have an extent of about 95 arcsec.
Abstract: The authors have mapped the 350-μm emission along the major axis of the dusty galaxy NGC 253 and find this to have an extent of about 95 arcsec. The total mass of interstellar material in the central kpc is ≡3×108M_sun;. Comparison of the results with CO observations suggests that the interstellar material in NGC 253 is in the form of massive clouds, similar to those in our Galaxy.
8 citations
TL;DR: In this article, the authors present the results of mapping the 350 μm emission around the bipolar outflow source GL 490 and report IRAS observations of this source, showing the source to be extended north-south.
Abstract: The authors present the results of mapping the 350 μm emission around the bipolar outflow source GL 490 They also report IRAS observations of this source The 350 μm data show the source to be extended north-south The authors interpret these results in terms of a disc of dust and gas surrounding the central embedded young star but show that it is incapable of channelling the bipolar molecular outflow The outflow must therefore be collimated on scales smaller than 1017cm
3 citations