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  • W J Altenhoff, J H Bieging, B Butler, H M Butner, R Chini, C G T Haslam +15 others
  • 1999
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)
  • R Q Mao, C Henkel, A Schulz, M Zielinsky, R Mauersberger, H Störzer +2 others
  • 2000
and 3–2 line emission was mapped with angular resolutions of 13 – 22 toward the nuclear region of the archetypical starburst galaxy M 82. There are two hotspots on either side of the dy-namical center, with the southwestern lobe being slightly more prominent. Lobe spacings are not identical for all transitions: For the submillimeter CO lines, the spacing is(More)
The J = 3 − 2 sub-mm line of 12 CO has been observed with the Heinrich-Hertz-Telescope (HHT) toward a sample of 28 nearby galaxies, and toward Arp 220. All sources are detected. This is the largest extragalactic sample of CO 3 − 2 spectra published so far. The 3 − 2 line fluxes, I 32 , are compared to 1 − 0 and 2 − 1 fluxes measured with the IRAM 30-m(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)
  • M Wang, C Henkel, Y.-N Chin, J B Whiteoak, M Hunt Cunningham, R Mauersberger +1 other
  • 2004
A multi-line millimeter-wave study of the nearby starburst galaxy NGC 4945 has been carried out using the Swedish-ESO Submillimeter Telescope (SEST). The study covers the frequency range from 82 GHz to 354 GHz and includes 80 transitions of 19 molecules. 1.3 mm continuum data of the nuclear source are also presented. An analysis of CO and 1.3 mm continuum(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)
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)
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)
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)