Sulphur-bearing species in the star forming region L1689N

Abstract

We report observations of the expected main S-bearing species (SO, SO2 and H2S) in the low-mass star forming region L1689N. We obtained large scale (~300''x200'') maps of several transitions from these molecules with the goal to study the sulphur chemistry, i.e. how the relative abundances change in the different physical conditions found in L1689N. We identified eight interesting regions, where we carried out a quantitative comparative study: the molecular cloud (as reference position), five shocked regions caused by the interaction of the molecular outflows with the cloud, and the two protostars IRAS16293-2422 and 16293E. In the cloud we carefully computed the gas temperature and density by means of a non-LTE LVG code, while in other regions we used previous results. We hence derived the column density of SO, SO2 and H2S, together with SiO and H2CO - which were observed previously - and their relevant abundance ratios. We find that SiO is the molecule that shows the largest abundance variations in the shocked regions, whereas S-bearing molecules show more moderate variations. Remarkably, the region of the brightest SiO emission in L1689N is undetected in SO2, H2S and H2CO and only marginally detected in SO. In the other weaker SiO shocks, SO2 is enhanced with respect to SO. We propose a schema in which the different molecular ratios correspond to different ages of the shocks. Finally, we find that SO, SO2 and H2S have significant abundance jumps in the inner hot core of IRAS16293-2422 and discuss the implications of the measured abundances.

Accepted 08/10/03

References in corpus (1)

• Water emission in NGC1333-IRAS4: The physical structure of the envelope

Cited by in corpus (33)

• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• ExoMol molecular line lists - XVI: The rotation-vibration spectrum of hot H${}_2$S
• Gas phase Elemental abundances in Molecular cloudS (GEMS). II. On the quest for the sulphur reservoir in molecular clouds: the $H_{2}S$ case
• Gas phase Elemental abundances in Molecular cloudS (GEMS) VII. Sulfur elemental abundance
• A SCUBA survey of L1689 - The dog that didn't bark
• A new look at sulphur chemistry in hot cores and corinos
• S-bearing molecules in Massive Dense Cores
• Sulphur chemistry and molecular shocks: the case of NGC1333-IRAS2
• Gas phase Elemental abundances in Molecular cloudS (GEMS). IV. Observational results and statistical trends
• Diverse nuclear star-forming activities in the heart of NGC 253 resolved with ten-pc scale ALMA images
• Subsurface chemistry of mantles of interstellar dust grains in dark molecular cores
• Quantifying the chemical desorption of H${}_2$S and PH${}_3$ from amorphous water ice surfaces
• Formation of S-bearing complex organic molecules in interstellar clouds via ice reactions with C2H2, HS, and atomic H
• The SVS13-A Class I chemical complexity as revealed by S-bearing species. SOLIS XIII
• Gas phase Elemental abundances in Molecular cloudS (GEMS) VI. A sulphur journey across star-forming regions: study of thioformaldehyde emission
• AB Aur, a Rosetta stone for studies of planet formation (II): H${}_2$S detection and sulfur budget
• Seeds of Life in Space SOLIS. IX. Chemical segregation of $\mathrm{S}{\mathrm{O}}_2$ and SO toward the low-mass protostellar shocked region of L1157
• Physical and chemical differentiation of the luminous star-forming region W49A - Results from the JCMT Spectral Legacy Survey
• H${}_2$S observations in young stellar disks in Taurus
• The molecular environment of the solar-type protostar IRAS 16293-2422
• SO2 and OCS toward high-mass protostars: A comparative study between ice and gas
• The warm-up phase in massive star-forming cores around RCW 120
• The physical and chemical structure of Sagittarius B2, VIII. Full molecular line survey of hot cores
• Evolution of Chemistry in the envelope of Hot Corinos (ECHOS). I. Extremely young sulphur chemistry in the isolated Class 0 object B335
• Ice origins of OCS and chemistry of CS2-bearing ice mantles
• An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253
• Binding Energies and Vibrational Spectral Features of S${}_n$ Species on Amorphous Water-ice Mantles: A Quantum Mechanical Study
• APEX and NOEMA observations of H${}_2$S in nearby luminous galaxies and the ULIRG Mrk~231 -- Is there a relation between dense gas properties and molecular outflows?
• H2S ice sublimation dynamics: experimentally constrained binding energies, entrapment efficiencies, and snowlines
• Gas phase Elemental abundances in Molecular cloudS (GEMS). IX. Deuterated compounds of H2S in starless cores
• Observational studies on S-bearing molecules in massive star forming regions
• High resolution ALMA observations of H${}_2$S in LIRGS (Dense gas and shocks in outflows and CNDs)
• Rotating Motion of the Outflow of IRAS 16293-2422 A1 at its Origin Point near the Protostar