2015A&A...579L...1Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:51:47

2015A&A...579L...1Z - Astronomy and Astrophysics, volume 579, L1-1 (2015/7-1)

Mercapto radical (SH) in translucent interstellar clouds.

ZHAO D., GALAZUTDINOV G.A., LINNARTZ H. and KRELOWSKI J.

Abstract (from CDS):

We present the first detection of rotationally resolved electronic transitions of the mercapto radical (SH) in the near-ultraviolet in translucent interstellar clouds. Observational data acquired by the Ultraviolet and Visual Echelle Spectrograph of the Very Large Telescope were used to search for the near-ultraviolet absorption spectra of SH. Two weak absorption features at ∼3242.40 and 3240.66Å, assigned as the pP11(3/2) and the (qP21(3/2)+qQ11(3/2)) doublet transitions in the A2Σ+-X2Π (0, 0) band of SH, respectively, were identified in the averaged spectrum of four selected lines of sight: HD73882, HD 78344, HD 80077, and HD 154368. These features are weak, but can be identified within a 3σ detection limit, and are found in other published data sets as well. We compiled a set of line positions and oscillator strengths of SH to facilitate the data analysis. We derived an averaged value of the SH column density, ∼1.5±0.3x1013cm–2, that is most likely representative for the magnitude of SH column densities in individual SH-rich translucent clouds. This value is also consistent with predictions from models for C-type shocks and turbulent dissipation regions with typical translucent cloud conditions.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - ISM: lines and bands - ultraviolet: ISM

Simbad objects: 4

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Number of rows : 4

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 HD 73882 EB* 08 39 09.53412 -40 25 09.2608 7.07 7.59 7.19 6.67 6.30 O8.5IV 219 2
2 HD 78344 * 09 05 51.3293958719 -47 46 06.830657900 10.10 10.12 9.00 8.55 8.16 O9.5/B0(Ib) 69 0
3 HD 80077 s*b 09 15 54.7869106351 -49 58 24.573847509 10.50 10.29 9.00 7.89   B2Ia+e 123 0
4 HD 154368 s*b 17 06 28.3687923960 -35 27 03.759955171 6.10 6.63 6.13 7.12   O9.5Iab 264 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:51:47

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