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We have observed both Comets Hyakutake and Hale–Bopp close to perigee with several telescopes at frequencies between 30 and 860 GHz for an extended period of time. The observed " light " curves can be described as a simple function of heliocentric and geocentric distances without any outburst or noticeable variability with time. Our most sensitive diameter(More)
The first definite discoveries of extragalactic deuterium are reported. DCO + has been detected in three and DCN has been measured in one star-forming region of the Large Magellanic Cloud (LMC). While the HCO + /DCO + abundance ratios are found to be 19 ± 3, 24 ± 4, and 67 ± 18 for N113, N44BC and N159HW, respectively , a HCN/DCN abundance ratio of 23 ± 5(More)
Although changes in magnitude of single traits responding to selective agents have been studied intensively, little is known about selection shaping networks of traits and their patterns of covariation. However, this is central for our understanding of phenotypic evolution as traits are embedded in a multivariate environment with selection affecting a(More)
We performed NLTE-radiative transfer calculations for interstellar A-type methanol maser lines in order to find out under which physical conditions the level populations show strong inversion. In our model we considered collisional as well as radiative pumping and accounted for line overlap as well as for torsional excitation of the methanol molecules. The(More)
We present observations of the singly and doubly deuterated species of thio-formaldehyde, HDCS and D 2 CS, towards the dark cloud Barnard 1. This is the first detection of D 2 CS in Space and in dense and cold prestellar regions. Column densities obtained using rotational diagrams and a Large Velocity Gradient – 2 – model show an extremely high(More)
The large scale structure and physics of molecular gas in the Galactic center region is discussed based on the detailed analysis of a 9 ′ resolution survey of the Galactic center region in the J = 1 → 0 line of C 18 O. Emphasis is placed on the comparison with 12 CO(1–0) data. The line shapes of C 18 O(1–0) and 12 CO(1–0) differ significantly. The ratio of(More)
The large scale structure and physics of molecular gas in the Galactic center region is discussed based on the detailed analysis of a 9 resolution survey of the Galactic center region in the J = 1 → 0 line of C 18 O. Emphasis is placed on the comparison with 12 CO(1–0) data. The line shapes of C 18 O(1–0) and 12 CO(1–0) differ significantly. The ratio of(More)
Burst escape speed is an effective and widely used behaviour for evading predators, with burst escape speed relying on several different morphological features. However, we know little about how behavioural and underlying morphological attributes change in concert as a response to changes in selective predation regime. We studied intercorrelated trait(More)