Using the powerful Heterodyne Receiver Array (HERA) on the IRAM m telescope (9 beams, 2 polarizations, NGC NGC NGC NGC – – – LDS – – – – 3 21 23, – – – 2 6 2 6 IRAM. from wastewater by maghemite nanoparticles. Water Research, , 39(18): – Iram M, Guo C, Guan Yet al. Adsorption and magnetic removal of.
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The legend at the bottom of the figure presents the line coding for the curves: Column densities and abundances with respect to the number of protons, i. To compute the spectroscopic parameters associated with the set of unidentified lines, we used higher order improvements to the simple model of a linear rotor.
Belloche 6 and D. Previous article Next article. Current usage metrics About article metrics Return to 453. Metrics Show article metrics. We only consider the most stable isomers to compare the measured and modeled abundances.
We wish to know to which development order we can significantly fit the frequency model to the observed data. Contour levels are shown in the grey-scale lookup tables. Lines simultaneously observed in the cut displayed in Fig. Molecular ions play ieam important role in the physics and chemistry of the insterstellar medium.
Services Articles citing this article CrossRef 4563 4S. The current usage metrics is available hours after online publication and is updated daily on week days. List of tables List of figures. We aim to constrain the chemical content of the Horsehead mane with a millimeter unbiased line survey at two positions, namely the photo-dissociation region PDR and the nearby shielded core.
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Pure gas-phase chemistry models do not succeed in reproducing the measured abundances of small hydrocarbons in the interstellar medium. Laboratory spectroscopy is underway to confirm these results. Summary Acknowledgments References Appendix A: Le Bourlot 3A. Simple hydrocarbon molecules, such as C 2 H, C 3 H, and C 3 H 2 have been detected in a wide variety of sources from diffuse e.
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Two positions are observed: This is due to a combination of two effects. We therefore assume that the eight lines have the same line width.
Bardeau 1A. The measured uram are typically one and two orders of magnitude higher than the modeled abundances for C 2 H and C 3 H 2.
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The illuminating star is positioned at the right of the plots. Carretera de Ajalvir, Km 4.
Indeed, the modeled and predicted abundances of c-C 3 H 2 are consistent, while the modeled abundance of C 2 H is still one order of magnitude lower than the measured abundance riam. Le Petit 3J.
Information on key gas-phase progenitors of these molecules sheds light on this problem. This led us to conclude that the species is a reactive molecule with a spatial distribution similar to small hydrocarbon chains.