2005A&A...431..203P

Query : 2005A&A...431..203P

2005A&A...431..203P - Astronomy and Astrophysics, volume 431, 203-213 (2005/2-3)

Far-infrared detection of methylene.

POLEHAMPTON E.T., MENTEN K.M., BRUENKEN S., WINNEWISSER G. and BALUTEAU J.-P.

Abstract (from CDS):

We present a clear detection of CH₂ in absorption towards the molecular cloud complexes Sagittarius B2 and W49 N using the ISO Long Wavelength Spectrometer. These observations represent the first detection of its low excitation rotational lines in the interstellar medium. Towards Sagittarius B2, we detect both ortho and para transitions allowing a determination of the total CH₂ column density of N(CH₂)=(7.5±1.1)x10¹⁴cm^–2. We compare this with the related molecule, CH, to determine [CH/CH₂]=2.7±0.5. Comparison with chemical models shows that the CH abundance along the line of sight is consistent with diffuse cloud conditions and that the high [CH/CH₂] ratio can be explained by including the effect of grain-surface reactions.

Abstract Copyright: ∼

Journal keyword(s): infrared: ISM - ISM: molecules - molecular data - ISM: individual objects: Sagittarius B2 - ISM: individual objects: W49

Simbad objects: 16

Full paper

View the references in ADS

Number of rows : 16

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	IC 63	HII	00 59 01.37	+60 53 17.8		13.33				~	97	1
2	* zet Per	s*b	03 54 07.9224751	+31 53 01.081262	2.19	2.97	2.85	2.71	2.62	B1Ib	847	0
3	NAME Orion-KL	SFR	05 35 14.16	-05 22 21.5						~	2229	1
4	HD 51479	*	06 57 07.9293535176	-10 16 47.524002564		8.42	8.43			B7V	28	1
5	NAME Sgr A Region	reg	17 45 12	-28 48.3						~	936	0
6	NAME Galactic Center	reg	17 45 39.60213	-29 00 22.0000						~	13682	0
7	NAME Sgr A*	X	17 45 40.03599	-29 00 28.1699						~	4144	3
8	NAME Sgr B2 (North)	Rad	17 47 20.2	-28 22 21						~	636	1
9	NAME Sgr B2	MoC	17 47 20.4	-28 23 07						~	2168	1
10	NAME Sgr B2 Main	Rad	17 47 20.5	-28 23 06						~	384	1
11	[DJW84] W49 A	HII	19 10 12.93	+09 06 11.9						~	33	0
12	[DJW84] W49 N	HII	19 10 15.38	+09 06 14.9						~	9	0
13	W 49	SFR	19 10 20	+09 07.7						~	558	1
14	W 51m	Rad	19 23.7	+14 30						~	58	0
15	W 51	SNR	19 23 50	+14 06.0						~	1251	1
16	NGC 7023	RNe	21 01 36.9	+68 09 48						~	687	0

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