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Molecular gas in the Andromeda galaxy
M 31, the closest large spiral galaxy to our own, is the best object for studying molecular clouds and their relation to the spiral structure. As one of the astronomical objects with the best knownExpand
Infrared Space Observatory's Discovery of C4H2, C6H2, and Benzene in CRL 618
We report on the detection with the Infrared Space Observatory (ISO), for the first time in the circumstellar medium, of the polyacetylenic chains C4H2 and C6H2 and of benzene (C6H6) in the directionExpand
A λ2 mm molecular line survey of the C-star envelope IRC+10216
The mm-wave spectrum of the C-star envelope IRC+10216 has been continuously surveyed between 129.0 and 172.5 GHz with the IRAM 30-m telescope. 380 lines are detected, of which 317 have been identied.Expand
The essential signature of a massive starburst in a distant quasar
The HCN line luminosity indicates the presence of 10 billion solar masses of very dense gas, an essential feature of an immense starburst, which contributes, together with the active galactic nucleus it harbours, to its high infrared luminosity. Expand
Probing isotopic ratios at z = 0.89 : molecular line absorption in front of the quasar PKS 1830-211
With the Plateau de Bure interferometer, we have measured the C, N, O and S isotopic abundance ratios in the arm of a spiral galaxy with a redshift of 0.89. The galaxy is seen face-on according toExpand
HCOOCH3 as a probe of temperature and structure in Orion-KL
Context. The Orion Kleinmann-Low nebula (Orion-KL) is a complex region of star formation. Whereas its proximity allows studies on a scale of a few hundred AU, spectral confusion makes it difficult toExpand
BR1202–0725: an extreme multiple merger at z = 4.7
The radio-quiet quasar BR1202-0725 (z=4.695) is a remarkable source with a bright Northwest (NW) companion detected at submm and radio wavelengths but invisible in the optical. In the absence ofExpand
Molecular abundances in the inner layers of IRC +10216
Observations towards IRC +10216 of CS, SiO, SiS, NaCl, KCl, AlCl, AlF, and NaCN have been carried out with the IRAM 30-m telescope in the 80-357.5 GHz frequency range. A large number of rotationalExpand
Methylpolyynes and small hydrocarbons in CRL 618
We report on the detection with the Infrared Space Observatory of strong infrared absorption from NH3 and C2H4 in CRL 618. The observed NH3 and C2H4 bands arise from a region with kineticExpand
A precise and accurate determination of the cosmic microwave background temperature at z = 0.89
Context. According to the Big Bang theory and as a consequence of adiabatic expansion of the Universe, the temperature of the cosmic microwave background (CMB) increases linearly with redshift. ThisExpand