2010A&A...521L..11S

Query : 2010A&A...521L..11S

2010A&A...521L..11S - Astronomy and Astrophysics, volume 521, L11-11 (2010/10-1)

Herschel observations of ortho- and para-oxidaniumyl (H₂O⁺) in spiral arm clouds toward Sagittarius B2(M).

SCHILKE P., COMITO C., MUELLER H.S.P., BERGIN E.A., HERBST E., LIS D.C., NEUFELD D.A., PHILLIPS T.G., BELL T.A., BLAKE G.A., CABRIT S., CAUX E., CECCARELLI C., CERNICHARO J., CROCKETT N.R., DANIEL F., DUBERNET M.-L., EMPRECHTINGER M., ENCRENAZ P., FALGARONE E., GERIN M., GIESEN T.F., GOICOECHEA J.R., GOLDSMITH P.F., GUPTA H., JOBLIN C., JOHNSTONE D., LANGER W.D., LATTER W.B., LORD S.D., MARET S., MARTIN P.G., MELNICK G.J., MENTEN K.M., MORRIS P., MURPHY J.A., OSSENKOPF V., PAGANI L., PEARSON J.C., PERAULT M., PLUME R., QIN S.-L., SALEZ M., SCHLEMMER S., STUTZKI J., TRAPPE N., VAN DER TAK F.F.S., VASTEL C., WANG S., YORKE H.W., YU S., ERICKSON N., MAIWALD F.W., KOOI J., KARPOV A., ZMUIDZINAS J., BOOGERT A., SCHIEDER R. and ZAAL P.

Abstract (from CDS):

H₂O⁺ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all spiral arm clouds between the Sun and Sgr B2. The average o/p ratio of H₂O⁺ in most velocity intervals is 4.8, which corresponds to a nuclear spin temperature of 21K. The relationship of this spin temperature to the formation temperature and current physical temperature of the gas hosting H₂O⁺ is discussed, but no firm conclusion is reached. In the velocity interval 0-60km/s, an ortho/para ratio of below unity is found, but if this is due to an artifact of contamination by other species or real is not clear.

Abstract Copyright: ∼

Journal keyword(s): astrochemistry - line: profiles - molecular processes

Simbad objects: 11

Full paper

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Number of rows : 11

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag V	Sp type	#ref 1850 - 2023	#notes
1	NAME Orion-KL	SFR	05 35 14.16	-05 22 21.5		~	2251	1
2	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000		~	13889	0
3	NAME Sgr A*	X	17 45 40.03599	-29 00 28.1699		~	4217	3
4	OH 000.66-00.03	Mas	17 47 20.12	-28 23 06.2		~	60	1
5	NAME Sgr B2 (North)	Rad	17 47 20.2	-28 22 21		~	646	1
6	NAME Sgr B2	MoC	17 47 20.4	-28 23 07		~	2198	1
7	NAME Sgr B2 Main	Rad	17 47 20.5	-28 23 06		~	390	1
8	W 31c	HII	18 10 29.1	-19 56 05		~	336	0
9	W 49	SFR	19 10 20	+09 07.7		~	564	1
10	W 51	SNR	19 23 50	+14 06.0		~	1258	1
11	NAME Cas A	SNR	23 23 24.000	+58 48 54.00	14.30	~	2724	1

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