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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Column densities and abundances with respect to the number of protons, i.

Norma IRAM 4536- Soldadura

They trace the gas physical conditions, e. The legend at the bottom of the figure presents the line coding for the curves: 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.

Two positions are observed: Current usage metrics About article metrics Return to article. Goicoechea 4S. This is likely for two reasons. Le Bourlot 3A. Carretera de Ajalvir, Km 4.

Roueff 3M. Initial download of the metrics may take a while. Previous article Next article. 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. The left column presents igam 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.

Data correspond to usage on the riam after Laboratory spectroscopy is underway to confirm these results.

Bardeau 1A. We therefore assume that the eight lines have the same line width. Metrics Show article metrics. We wish to know to which development order we can significantly fit the frequency model to the observed data. Gratier 1V. Pure gas-phase chemistry models do not succeed in reproducing the measured abundances of jram hydrocarbons in the interstellar medium.

norma iram 4536 .soldadura.pdf

Displayed integrated intensities are expressed in the main beam temperature scale. 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.

Sievers 5F. Summary Acknowledgments References Appendix A: We only consider the most stable isomers to compare the measured irm modeled abundances.

Contour levels are shown in the grey-scale lookup tables. This led us to conclude that the species is a reactive molecule with a spatial distribution similar to small hydrocarbon chains.

Lines simultaneously observed in the cut displayed in Fig. Gerin 2J.

The illuminating star is positioned at the right of the plots. We used the Ohio State University osu pure gas-phase chemical network upgraded for photochemical studies.

Scientific Results in Press

This is due to a combination of two effects. Le Petit 3J. The spectra and the Gaussian fits are shown as black histograms and green curves, respectively.

List of tables List of figures. The green lines are Gaussian fits. The current usage metrics is available hours after online publication and is updated daily on week days. 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. This assumption enables a quick fit convergence when we start the fit with the following initial values: 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.

Molecular ions play an important role in the physics and chemistry of the insterstellar medium. Janssen, Meudon Cedex, France e-mail: Belloche 6 and D. Information on key gas-phase progenitors of these molecules sheds light on this problem.