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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This is due to a combination of two effects. The illuminating star is positioned at the right of the plots. Bardeau 1A.
Data correspond to usage on the plateform after We therefore assume that the eight lines have the same line width. Gratier 1V. The left column presents the profiles computed by the code, which samples the UV-illuminated gas on a finer spatial grid than the UV-shielded gas to correctly represent the steep physical and chemical gradients. Current usage metrics About article metrics Return to article. Molecular ions play an important role in the physics and chemistry of the insterstellar medium.
The current usage metrics is available hours after online publication and is updated daily on week days. We only consider the most stable isomers to compare the measured and modeled abundances.
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. Contour levels are shown in the grey-scale lookup tables. Laboratory spectroscopy is underway to confirm these results.
Summary Acknowledgments References Appendix A: Le Bourlot 3A. Column densities and abundances with respect to the number of protons, i.
Norma Iram Iso – PDF Free Download
Janssen, Meudon Cedex, France e-mail: Gerin 2J. List of tables List of figures. We used the Ohio State University osu pure gas-phase chemical network upgraded for photochemical studies.
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. Initial download of the metrics may take a while. The spectra and the Gaussian fits are shown as black histograms and green curves, respectively.
This assumption enables a quick fit convergence when we start the fit with the following initial values: The measured abundances are typically one and two orders of magnitude higher than the modeled abundances for C 2 H and C 3 H 2.
This led us to conclude that the species is a reactive molecule with a spatial distribution similar to small hydrocarbon chains. Carretera de Ajalvir, Km 4. Sievers 5F. Roueff 3M. They trace the gas physical conditions, e. Displayed integrated intensities are expressed in the main beam temperature scale. Lines simultaneously observed in the cut displayed in Fig. We wish to know to which development order we can significantly fit the frequency model to the observed data. 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 cf.
This is likely for two reasons. Services Articles citing this article CrossRef Pure gas-phase chemistry models do not succeed in reproducing the measured abundances of small hydrocarbons in the interstellar medium. The legend at the bottom of the figure presents the line coding for the curves: Previous article Next article.
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Two positions are observed: The green lines are Gaussian fits. Belloche 6 and D. Le Petit 3J. Metrics Show article metrics.
Information on key gas-phase progenitors of these molecules sheds light on this problem. 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.