2002A&A...390..363I


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST06:26:02

2002A&A...390..363I - Astronomy and Astrophysics, volume 390, 363-367 (2002/7-4)

Multi-transitional observations of methanol in Comet Hale-Bopp (1995 O1).

IKEDA M., KAWAGUCHI K., TAKAKUWA S., SAKAMOTO A., SUNADA K. and FUSE T.

Abstract (from CDS):

We have observed 9 rotational lines of methanol in comet Hale-Bopp (1995 O1) using the 45-m radio telescope at Nobeyama Radio Observatory in the frequency range 36-104GHz. The observed transitions have upper state rotational energy levels of Eu=7-159K. Assuming the Haser model for density distribution, we estimated the excitation temperature and the production rate to be Tex=81±8K and Q(CH3OH)=(1.2±0.1)x1029 molecule/s, respectively. We also observed the HCN J=1-0 line at 88GHz to derive the HCN production rate. We compared the production rate of CH3OH with that of HCN and that of other molecules whose production rates have been determined previously. The abundance ratio Q(CH3OH)/Q(X) is estimated to be in the range 3-121, where X denotes HCN, HNC, H2CO, CS and CH3CN. When we compare these abundance ratios with those in interstellar clouds: the bipolar flow L1157 B1/B2, the star-forming region SgrB2(M) and the dark cloud TMC-1, they are close to the values in L1157 B1/B2 or in SgrB2(M). We found that the abundance ratio Q(CH3OH)/Q(H2O) was similar to solid methanol ratio relative to water ice in interstellar medium. These results support the hypothesis that cometary nuclei are formed from dust grains outside of the primordial solar nebula so that the grain composition of the nebula remains in cometary nuclei.

Abstract Copyright:

Journal keyword(s): comets: general - comets: individual: C/1995 O1(Hale-Bopp) - ISM: abundances

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1378 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2025 1
3 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 337 1
4 W 33a Y*O 18 14 39.0 -17 52 03           ~ 588 0
5 [DE95] LDN 1157 B2 out 20 39 09.3 +68 00 44           ~ 61 0
6 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 188 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-06:26:02

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