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

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

2005A&A...431..203P - Astronomy and Astrophysics, volume 431203-213 (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.

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

Simbad objects: 16

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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 - 2026 		#notes
1 IC 63 HII 00 59 01.37 +60 53 17.8   13.33       ~ 105 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 881 0
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
4 HD 51479 * 06 57 07.9293535176 -10 16 47.524002564   8.42 8.43     B7V 30 1
5 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 955 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
7 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
8 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 742 1
9 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
10 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 436 1
11 [DJW84] W49 A HII 19 10 12.93 +09 06 11.9           ~ 34 0
12 [DJW84] W49 N HII 19 10 15.38 +09 06 14.9           ~ 10 0
13 W 49 SFR 19 10 20 +09 07.7           ~ 601 1
14 W 51m Rad 19 23.7 +14 30           ~ 72 0
15 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
16 NGC 7023 OpC 21 01 36.9 +68 09 48           ~ 739 0

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