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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We only consider the most stable isomers to compare the measured and modeled abundances. The legend at the bottom of the figure presents the line coding for the curves: Sievers 5F.

This is due to ira, combination of two effects. 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. 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.

Roueff 3M. 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 is likely for two reasons. Carretera de Ajalvir, Km 4. We wish to know irak which development order we can significantly fit the frequency model to the observed 453.


This led us to conclude that the species is a reactive molecule with a spatial distribution similar to small hydrocarbon chains.

Two positions are observed: We used the Ohio State University osu pure gas-phase chemical network upgraded for photochemical studies. Column densities and abundances with respect to the number of protons, i. Lines simultaneously observed in the cut displayed in Fig.

Contour levels are shown in the grey-scale lookup tables. Information on key irzm progenitors of these molecules sheds light on this problem. Previous article Next article. Le Petit 3J. Summary Acknowledgments References Appendix A: 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 ira gradients.

Le Bourlot 3A. To compute the 4563 parameters associated with the set of unidentified lines, we used higher order improvements to the simple model of a linear rotor.

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Initial download of the metrics may take a while. Belloche 6 and D.

norma iram

The green lines are Gaussian fits. Gerin 2J. Gratier 1V.

Laboratory spectroscopy is underway to confirm these results. 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.

NORMA IRAM 3549 Mangas.pdf

Services Articles citing this article CrossRef Current usage metrics About article metrics Return to article. Bardeau 1A. Displayed integrated intensities are expressed in the main beam temperature scale.

Metrics Show article metrics. List of tables List of figures. Pure gas-phase chemistry models do not succeed in reproducing the measured abundances of small hydrocarbons in the interstellar medium.

Molecular ions play an important role in the physics and chemistry of the insterstellar medium. The spectra and the Gaussian fits are shown as black histograms and green curves, respectively.