Expanding the submillimeter wave spectroscopy and astronomical search for thioacetamide (CH3CSNH2) in the ISM

Abstract

Thioacetamide (CH3CSNH2) is the sulfur analog to acetamide (CH3CONH2) and it is a viable candidate to search for in astronomical environments specifically toward regions where other S-bearing molecules have been found and, if possible, that also contain a detection of CH3CONH2. If detected, it would not only continue to expand the view of molecular complexity in astronomical environments, but also help to better elucidate the possible formation pathways of these types of species in these environments. The rotational spectrum of CH3CSNH2 was investigated up to 650 GHz. Using the newly refined spectrum of CH3CSNH2, as well as additional spectroscopic data on the chemically related species CH3CONH2, a variety of astronomical sources were searched including data from the following large surveys: The PRIMOS conducted with the Green Bank Telescope (GBT); Exploring molecular complexity with ALMA (EMoCA) conducted with ALMA; and Astrochemical Surveys at IRAM (ASAI) conducted with the Institut de Radioastronomie Millimetrique (IRAM) 30m Telescope. A total of 1428 transitions from the vt=0 state with maximum values J=47 and Ka=20 in the range up to 330 GHz, and J=95 and Ka=20 in the range from 400 - 660 GHz were assigned. We also assigned 321 transitions from the vt=1 state with the maximum values J=35 and Ka=9 up to 330 GHz. The final fit is based on the rho-axis-method (RAM) Hamiltonian model that includes 40 parameters. An astronomical search for CH3CSNH2 was conducted based on all the new spectroscopic data. No transitions of CH3CSNH2 were detected toward any of the sources contained in our survey. Using the appropriate telescope and physical parameters for each astronomical source, upper limits to the column densities were found for CH3CSNH2 toward each source.

arXiv comment16 pages, 8 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (49)

• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)
• How to Calculate Molecular Column Density
• Discovery of the Interstellar Chiral Molecule Propylene Oxide (CH${}_3$CHCH${}_2$O)
• The largest oxigen bearing organic molecule repository
• Exploring Molecular Complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2)
• Gas phase formation of the prebiotic molecule formamide: insights from new quantum computations
• Resetting chemical clocks of hot cores based on S-bearing molecules
• An extraordinary outburst in the massive protostellar system NGC6334I-MM1: quadrupling of the millimeter continuum
• Weeds: a CLASS extension for the analysis of millimeter and sub-millimeter spectral surveys
• Re-exploring Molecular Complexity with ALMA (ReMoCA): Interstellar detection of urea
• Rotational spectroscopy, tentative interstellar detection, and chemical modelling of N-methylformamide
• The chemistry of interstellar molecules containing the halogen elements
• Sulphur chemistry in the envelopes of massive young stars
• Exploring molecular complexity with ALMA (EMoCA): Alkanethiols and alkanols in Sagittarius B2(N2)
• Astrochemical evolution along star formation: Overview of the IRAM Large Program ASAI
• Spitzer IRS Observations of Class I/II Objects in Taurus: Composition and Thermal History of the Circumstellar Ices
• New quantum chemical computations of formamide deuteration support a gas-phase formation of this prebiotic molecule
• {Millimeter Multiplicity in NGC 6334 I and I(N)
• Interstellar Isomers: The Importance of Bonding Energy Differences
• Distributed star formation throughout the Galactic Center cloud Sgr B2
• TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H2CCS, H2CCCS, and C4S and detection of C5S
• The complex chemistry of hot cores in Sagittarius B2(N): Influence of cosmic-ray ionization and thermal history
• Exploring molecular complexity with ALMA (EMoCA): Detection of three new hot cores in Sagittarius B2(N)
• Laboratory and tentative interstellar detection of trans-methyl formate using the publicly available Green Bank Telescope PRIMOS survey
• The formation of peptide-like molecules on interstellar dust grains
• ALMA Detection of Interstellar Methoxymethanol (CH${}_3$OCH${}_2$OH)
• Chemistry in disks. XI. Sulfur-bearing species as tracers of protoplanetary disk physics and chemistry: the DM Tau case
• The physical and chemical structure of Sagittarius B2. II. Continuum millimeter emission of SgrB2(M) and SgrB2(N) with ALMA
• Molecular line survey of the high-mass star-forming region NGC 6334I with Herschel/HIFI and the SMA
• Modelling the sulphur chemistry evolution in Orion KL
• Interstellar Carbodiimide (HNCNH) - A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features
• The family of amide molecules toward NGC 6334I
• The Massive Protostellar Cluster NGC6334I at 220 AU Resolution: Discovery of Further Multiplicity, Diversity and a Hot Multi-Core
• The GUAPOS project II. A comprehensive study of peptide-like bond molecules
• The Case of H${}_2$C${}_3$O Isomers, Revisited: Solving the Mystery of the Missing Propadienone
• Weak maser emission of methyl formate toward Sagittarius B2(N) in the Green Bank Telescope PRIMOS Survey
• Interstellar Glycolaldehyde, Methyl Formate, and Acetic Acid I: A Bi-modal Abundance Pattern in Star Forming Regions
• An ATCA Survey of Sagittarius~B2 at 7~mm: Chemical Complexity Meets Broadband Interferometry
• First Results of an ALMA Band 10 Spectral Line Survey of NGC 6334I: Detections of Glycolaldehyde (HC(O)CH${}_2$OH) and a New Compact Bipolar Outflow in HDO and CS
• Sulfur-Bearing Molecules In Massive Star-Forming Regions: Observations Of OCS, CS, H2S and SO
• Non-Thermal Continuum toward SGRB2(N-LMH)
• Collisional Excitation and Weak Maser Action of Interstellar Methanimine
• The Molecular Chemistry of Diffuse and Translucent Clouds in the Line-of-Sight to Sgr B2
• The Sub-millimeter Rotational Spectrum of Ethylene Glycol up to 890 GHz and Application to ALMA Band 10 Spectral Line Data of NGC 6334I
• SiS formation in the interstellar medium through Si+SH gas phase reactions
• ALMA Detection of Vibrationally Excited ($v{}_{\mathrm{t}}=1,2$) Acetic Acid toward NGC 6334I

Cited by in corpus (2)

• Amides inventory towards the G+0.693-0.027 molecular cloud
• Searching for Propionamide (C2H5CONH2) Toward Sagittarius B2 at Centimeter Wavelengths