2010A&A...521L...9L

Query : 2010A&A...521L...9L

2010A&A...521L...9L - Astronomy and Astrophysics, volume 521, L9-9 (2010/10-1)

Herschel/HIFI discovery of interstellar chloronium (H₂Cl⁺).

LIS D.C., PEARSON J.C., NEUFELD D.A., SCHILKE P., MUELLER H.S.P., GUPTA H., BELL T.A., COMITO C., PHILLIPS T.G., BERGIN E.A., CECCARELLI C., GOLDSMITH P.F., BLAKE G.A., BACMANN A., BAUDRY A., BENEDETTINI M., BENZ A., BLACK J., BOOGERT A., BOTTINELLI S., CABRIT S., CASELLI P., CASTETS A., CAUX E., CERNICHARO J., CODELLA C., COUTENS A., CRIMIER N., CROCKETT N.R., DANIEL F., DEMYK K., DOMINIC C., DUBERNET M.-L., EMPRECHTINGER M., ENCRENAZ P., FALGARONE E., FUENTE A., GERIN M., GIESEN T.F., GOICOECHEA J.R., HELMICH F., HENNEBELLE P., HENNING Th., HERBST E., HILY-BLANT P., HJALMARSON A., HOLLENBACH D., JACK T., JOBLIN C., JOHNSTONE D., KAHANE C., KAMA M., KAUFMAN M., KLOTZ A., LANGER W.D., LARSSON B., LE BOURLOT J., LEFLOCH B., LE PETIT F., LI D., LISEAU R., LORD S.D., LORENZANI A., MARET S., MARTIN P.G., MELNICK G.J., MENTEN K.M., MORRIS P., MURPHY J.A., NAGY Z., NISINI B., OSSENKOPF V., PACHECO S., PAGANI L., PARISE B., PERAULT M., PLUME R., QIN S.-L., ROUEFF E., SALEZ M., SANDQVIST A., SARACENO P., SCHLEMMER S., SCHUSTER K., SNELL R., STUTZKI J., TIELENS A., TRAPPE N., VAN DER TAK F.F.S., VAN DER WIEL M.H.D., VAN DISHOECK E.F., VASTEL C., VITI S., WAKELAM V., WALTERS A., WANG S., WYROWSKI F., YORKE H.W., YU S., ZMUIDZINAS J., DELORME Y., DESBAT J.-P., GUESTEN R., KRIEG J.-M. and DELFORGE B.

Abstract (from CDS):

We report the first detection of chloronium, H₂Cl⁺, in the interstellar medium, using the HIFI instrument aboard the Herschel Space Observatory. The 2₁₂-1₀₁ lines of ortho-H₂³⁵Cl⁺ and ortho-H₂³⁷Cl⁺ are detected in absorption towards NGC 6334I, and the 1₁₁-0₀₀ transition of para-H₂³⁵Cl⁺ is detected in absorption towards NGC 6334I and Sgr B2(S). The H₂Cl⁺ column densities are compared to those of the chemically-related species HCl. The derived HCl/H₂Cl⁺ column density ratios, ∼1-10, are within the range predicted by models of diffuse and dense photon dominated regions (PDRs). However, the observed H₂Cl⁺ column densities, in excess of 10¹³cm^–2, are significantly higher than the model predictions. Our observations demonstrate the outstanding spectroscopic capabilities of HIFI for detecting new interstellar molecules and providing key constraints for astrochemical models.

Abstract Copyright: ∼

Journal keyword(s): astrochemistry - line: identification - ISM: abundances - ISM: molecules - molecular processes - submillimetre: ISM

Simbad objects: 8

Full paper

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Number of rows : 8

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Sp type	#ref 1850 - 2023	#notes
1	IRC +10216	C*	09 47 57.40632	+13 16 43.5648	C9,5e	2303	0
2	NGC 6334	HII	17 20 53	-36 07.9	~	674	0
3	NAME NGC 6334-I	Cl*	17 20 53.35	-35 47 01.5	~	333	0
4	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000	~	13889	0
5	NAME Sgr B2	MoC	17 47 20.4	-28 23 07	~	2198	1
6	NAME Sgr B2 (South)	HII	17 47 20.430	-28 23 45.06	~	96	0
7	NAME Sgr B2 Main	Rad	17 47 20.5	-28 23 06	~	390	1
8	RAFGL 2591	Y*O	20 29 24.8230	+40 11 19.590	~	613	0

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