2001A&A...376L...5K


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST12:58:27

2001A&A...376L...5K - Astronomy and Astrophysics, volume 376, L5-8 (2001/9-2)

Gas-phase SO2 in absorption towards massive protostars.

KEANE J.V., BOONMAN A.M.S., TIELENS A.G.G.M. and VAN DISHOECK E.F.

Abstract (from CDS):

We present the first detection of the nu ro-vibrational band of gas-phase SO2 in absorption in the mid-infrared spectral region around 7.3µm of a sample of deeply embedded massive protostars. Comparison with model spectra shows that the derived excitation temperatures correlate with previous C2H2 and HCN studies, indicating that the same warm gas component is probed. The SO2 column densities are similar along all lines of sight suggesting that the SO2 formation has saturated, but not destroyed, and the absolute abundances of SO2 are high (∼10–7). Both the high temperature and the high abundance of the detected SO2 are not easily explained by standard hot core chemistry models. Likewise, indicators of shock induced chemistry are lacking.

Abstract Copyright:

Journal keyword(s): star-formation: gas-phase molecules - ISM: abundances - ISM: molecules

Simbad objects: 9

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Number of rows : 9

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 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 330 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2025 1
3 NAME Mon R2 IRS 3 Y*O 06 07 47.8 -06 22 55           ~ 134 0
4 RAFGL 4176 IR 13 43 01.704 -62 08 51.23           ~ 91 0
5 [GGB2012] G308.9176+00.1231 HII 13 43 02.1 -62 08 52           ~ 59 0
6 W 33a Y*O 18 14 39.0 -17 52 03           ~ 587 0
7 RAFGL 2136 SFR 18 22 26.8740 -13 30 17.177           ~ 247 0
8 RAFGL 2591 Y*O 20 29 25.03656 +40 11 20.3316           ~ 571 0
9 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 369 3

    Equat.    Gal    SGal    Ecl

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2020.10.21-12:58:27

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