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2 results on '"Diez-Gonzalez, M.C."'

1. Detection of OH+ and H2O+ towards Orion KL

Author

Gupta, H., Rimmer, P., Pearson, J.C., Yu, S., Herbst, E., Harada, N., Bergin, E.A., Neufeld, D.A., Melnick, G.J., Bachiller, R., Bells, T.A., Blake, G.A., Caux, E., Ceccarelli, C., Cernicharo, J., Chattopadhyay, G., Comito, C., Cabrit, S., Crockett, N.R., Daniel, F., Falgarone, E., Diez-Gonzalez, M.C., Dubernet, M.-L., Erickson, N., Emprechtinger, M., Encrenaz, P., Gerin, M., Gill, J.J., Giesen, T.F., Goicoechea, J.R., Goldsmith, P.F., Joblin, C., Johnstone, D., Langer, W.D., Larsson, B., Latter, W.B., Lin, R.J., Lis, D.C., Liseau, R., Lord, S.D., Maiwald, F.W., Maret, S., Martin, P.G., Martin-Pintado, J., Menten, K.M., Morris, P., Muller, H.S.P., Murphy, J.A., Nordh, L.H., Olberg, M., Ossenkopf, V., Pagani, L., Perault, M., Phillips , T.G., Plume, R., Qin, S.-L., Salez, M., Samoska, L.A., Schilke, P., Schlecht, E., Schlemmer, S., Szczerba, R., Stutzki, J., Trappe, N., van der Tak, F.F.S., Vastel, C., Wang, S., Yorke, H.W., Zmuidzinas, J., Boogert, A., Gusten, R., Hartogh, P., Honigh, N., Karpov, A., Kooi, J., Krieg, J.-M., Schieder, R., and Zaal, P.

Subjects
Experimental Physics
Abstract

We report observations of the reactive molecular ions OH+, H2O+, and H3O+ towards Orion KL with Herschel/HIFI. All three N = 1−0 finestructure transitions of OH+ at 909, 971, and 1033 GHz and both fine-structure components of the doublet ortho-H2O+ 111−000 transition at 1115 and 1139 GHz were detected; an upper limit was obtained for H3O+. OH+ and H2O+ are observed purely in absorption, showing a narrow component at the source velocity of 9 km s−1, and a broad blueshifted absorption similar to that reported recently for HF and para-H18 2 O, and attributed to the low velocity outflow of Orion KL.We estimate column densities of OH+ and H2O+ for the 9 kms−1 component of 9±3×1012 cm−2 and 7±2×1012 cm−2, and those in the outflow of 1.9±0.7×1013 cm−2 and 1.0±0.3×1013 cm−2. Upper limits of 2.4×1012 cm−2 and 8.7×1012 cm−2 were derived for the column densities of ortho and para-H3O+ from transitions near 985 and 1657 GHz. The column densities of the three ions are up to an order of magnitude lower than those obtained from recent observations ofW31C and W49N. The comparatively low column densities may be explained by a higher gas density despite the assumption of a very high ionization rate.

Published
2010

2. Herschel observations of EXtra-Ordinary Sources (HEXOS): detecting spiral arm clouds by CH absorption lines

Author

Qin, S.-L., Schilke, P., Comito, C., Moller, T., Rolff, R., Muller, H.S.P., Belloche, A., Menten, K.M., Lis, D.C., Phillips , T.G., Bergin, E.A., Bell, T.A., Crockett, N.R., Blake, G.A., Cabrit, S., Caux, E., Ceccarelli, C., Cernicharo, J., Daniel, F., Dubernet, M.-L., Emprechtinger, M., Encrenaz, P., Falgarone, E., Gerin, M., Giesen, T.F., Goicoechea, J.R., Goldsmith, P.F., Gupta, H., Herbst, E., Joblin, C., Johnstone, D., Langer, W.D., Lord, S.D., Maret, S., Martin, P.G., Melnick, G.J., Morris, P., Murphy, J.Anthony, Neufeld, D.A., Ossenkopf, V., Pagani, L., Pearson, J.C., Perault, M., Plume, R., Salez, M., Schlemmer, S., Stutzki, J., Trappe, Neil, van der Tak, F.F.S., Vastel, C., Wang, S., Yorke, H.W., Yu, S., Zmuidzinas, J., Boogert, A., Gusten, R., Hartogh, P., Honingh, E., Karpov, A., Kooi, J., Krieg, J.-M., Schieder, R., Diez-Gonzalez, M.C., Bachiller, R., Martin-Pintado, J., Baechtold, W., Olberg, M., Nordh, L.H., Gill, J.L., Chattopadhyay, G., Qin, S.-L., Schilke, P., Comito, C., Moller, T., Rolff, R., Muller, H.S.P., Belloche, A., Menten, K.M., Lis, D.C., Phillips , T.G., Bergin, E.A., Bell, T.A., Crockett, N.R., Blake, G.A., Cabrit, S., Caux, E., Ceccarelli, C., Cernicharo, J., Daniel, F., Dubernet, M.-L., Emprechtinger, M., Encrenaz, P., Falgarone, E., Gerin, M., Giesen, T.F., Goicoechea, J.R., Goldsmith, P.F., Gupta, H., Herbst, E., Joblin, C., Johnstone, D., Langer, W.D., Lord, S.D., Maret, S., Martin, P.G., Melnick, G.J., Morris, P., Murphy, J.Anthony, Neufeld, D.A., Ossenkopf, V., Pagani, L., Pearson, J.C., Perault, M., Plume, R., Salez, M., Schlemmer, S., Stutzki, J., Trappe, Neil, van der Tak, F.F.S., Vastel, C., Wang, S., Yorke, H.W., Yu, S., Zmuidzinas, J., Boogert, A., Gusten, R., Hartogh, P., Honingh, E., Karpov, A., Kooi, J., Krieg, J.-M., Schieder, R., Diez-Gonzalez, M.C., Bachiller, R., Martin-Pintado, J., Baechtold, W., Olberg, M., Nordh, L.H., Gill, J.L., and Chattopadhyay, G.

Abstract

We have observed CH absorption lines (J = 3/2, N = 1 ← J = 1/2, N = 1) against the continuum source Sgr B2(M) using the Herschel/HIFI instrument. With the high spectral resolution and wide velocity coverage provided by HIFI, 31 CH absorption features with different radial velocities and line widths are detected and identified. The narrower line width and lower column density clouds show “spiral arm” cloud characteristics, while the absorption component with the broadest line width and highest column density corresponds to the gas from the Sgr B2 envelope. The observations show that each “spiral arm” harbors multiple velocity components, indicating that the clouds are not uniform and that they have internal structure. This line-of-sight through almost the entire Galaxy offers unique possibilities to study the basic chemistry of simple molecules in diffuse clouds, as a variety of different cloud classes are sampled simultaneously. We find that the linear relationship between CH and H2 column densities found at lower AV by UV observations does not continue into the range of higher visual extinction. There, the curve flattens, which probably means that CH is depleted in the denser cores of these clouds.

Published
2010

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