4.7 Article

H2CN/H2NC abundance ratio: a new potential temperature tracer for the interstellar medium

相关参考文献

注意:仅列出部分参考文献,下载原文获取全部文献信息。
Article Astronomy & Astrophysics

The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction☆

M. Agundez et al.

Summary: This study conducted an observational search for the molecules H2NC and H2CN in different types of interstellar regions, aiming to understand their abundance and formation mechanism. H2NC was detected in all but one of the cold dense clouds targeted, while H2CN was only detected in five out of the eight clouds. The column densities of H2NC and H2CN ranged from 10(11) to 10(12) cm(-2), and the abundance ratio H2NC/H2CN varied between 0.51 and >2.7. The chemical link between NH3 and H2NC was supported by the correlation between their column densities. The reaction C + NH3 was found to be the main source of H2NC in interstellar clouds according to both astronomical observations and theoretical calculations.

ASTRONOMY & ASTROPHYSICS (2023)

Article Astronomy & Astrophysics

Cyanopolyyne Chemistry in the L1544 Prestellar Core: New Insights from GBT Observations

Eleonora Bianchi et al.

Summary: In this study, a comprehensive investigation of the cyanopolyyne chemistry in the prototypical prestellar core L1544 is conducted. HC9N is detected for the first time towards the source. The high spectral resolution reveals double-peak spectral line profiles, with the redshifted peak being 3-5 times brighter. The emission of cyanopolyyne is likely associated with the southern region of the core where free carbon atoms are available for the formation of long chains.

ASTROPHYSICAL JOURNAL (2023)

Article Astronomy & Astrophysics

Sampling molecular gas in the Helix planetary nebula: Variation in HNC/HCN with UV flux

J. Bublitz et al.

Summary: The HNC/HCN ratio in the Helix planetary nebula is dependent on UV radiation, gas pressure, and density. Observations indicate that the HNC/HCN ratio increases with radial distance from the central star.

ASTRONOMY & ASTROPHYSICS (2022)

Article Astronomy & Astrophysics

Deuterium Fractionation as a Multiphase Component Tracer in the Galactic Center

Laura Colzi et al.

Summary: The gas in the Central Molecular Zone (CMZ) is mostly warm and turbulent, but the presence of a colder, denser, and less turbulent component has been observed for the first time. This narrow component has a narrower line width and higher D/H ratios compared to the broader component, indicating higher kinetic temperatures and H-2 densities. This method can be used to identify clouds on the verge of star formation in the CMZ and potentially in external galaxies.

ASTROPHYSICAL JOURNAL LETTERS (2022)

Article Astronomy & Astrophysics

Precursors of fatty alcohols in the ISM: Discovery of n-propanol

Izaskun Jimenez-Serra et al.

Summary: The discovery of n-propanol in the interstellar medium suggests that the building blocks for cell membranes may originate from outer space.

ASTRONOMY & ASTROPHYSICS (2022)

Article Astronomy & Astrophysics

Precursors of the RNA World in Space: Detection of (Z)-1,2-ethenediol in the Interstellar Medium, a Key Intermediate in Sugar Formation

Victor M. Rivilla et al.

Summary: We report the first detection of (Z)-1,2-ethenediol, the enol form of glycolaldehyde, in a molecular cloud near the Galactic Center. The molecular abundance with respect to molecular hydrogen is determined, and the possible formation routes and its relation to glyceraldehyde are discussed.

ASTROPHYSICAL JOURNAL LETTERS (2022)

Article Astronomy & Astrophysics

2021 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules

Brett A. McGuire

Summary: A total of 241 molecular species composed of 19 different elements have been detected in the interstellar and circumstellar medium through astronomical observations. These molecules vary in size from two atoms to 70 and can be detected across a wide range of wavelengths. This census provides a summary of the first detection of each molecular species, including details on the observational facility, wavelength range, transitions, and relevant laboratory spectroscopic work. Tentative and disputed detections are also listed, and tables for molecules detected in interstellar ices, external galaxies, protoplanetary disks, and exoplanetary atmospheres are included. Various visual representations of the aggregated data are briefly discussed.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2022)

Article Chemistry, Physical

Gliding on Ice in Search of Accurate and Cost-EffectiveComputational Methods for Astrochemistry on Grains: The PuzzlingCase of the HCN Isomerization

Carmen Baiano et al.

Summary: In this study, the isomerization of hydrogen cyanide on icy grain surfaces was investigated using a composite method (jun-Cheap) and density functional approaches. The results showed that four water molecules were involved in a proton relay mechanism, leading to a reduction in activation energy and facilitating the isomerization process.

JOURNAL OF CHEMICAL THEORY AND COMPUTATION (2022)

Article Chemistry, Multidisciplinary

Collisional excitation of HNC by He found to be stronger than for structural isomer HCN in experiments at the low temperatures of interstellar space

Brian M. Hays et al.

Summary: HCN and HNC, two molecules observed in the interstellar medium, have different collisional excitation properties and their abundance ratios correlate strongly with temperature.

NATURE CHEMISTRY (2022)

Article Astronomy & Astrophysics

Ionize Hard: Interstellar PO+ Detection

Victor M. Rivilla et al.

Summary: We have detected the presence of phosphorus monoxide ion (PO+) in the interstellar medium for the first time. Our study shows that the abundance of PO+ is larger than other phosphorus-bearing species, indicating its importance in interstellar phosphorus chemistry. The high gas-phase abundance of PO+ is attributed to sputtering of interstellar icy grain mantles and efficient ionization by cosmic rays. New chemical models further confirm the enhanced abundance of PO+ in shocked regions with high cosmic-ray ionization rates.

FRONTIERS IN ASTRONOMY AND SPACE SCIENCES (2022)

Article Astronomy & Astrophysics

Molecular Precursors of the RNA-World in Space: New Nitriles in the G+0.693-0.027 Molecular Cloud

Victor M. Rivilla et al.

Summary: Nitriles play a crucial role in prebiotic experiments based on the RNA-world scenario for the origin of life, and they could have originated from extraterrestrial objects and formed reservoirs in the interstellar medium. The study detects several nitriles and discusses their formation mechanisms in the interstellar medium.

FRONTIERS IN ASTRONOMY AND SPACE SCIENCES (2022)

Article Astronomy & Astrophysics

Tracing Interstellar Heating: An ALCHEMI Measurement of the HCN Isomers in NGC 253

Erica Behrens et al.

Summary: We analyzed the emission of HCN and HNC in the nearby starburst galaxy NGC 253 to investigate its effectiveness in tracing heating processes associated with star formation. Our results show that the density and cosmic-ray ionization rate are enhanced in the central regions of the galaxy, and there is a positive correlation between the density and cosmic-ray ionization rate with the number of star formation-related heating sources in each giant molecular cloud. We also observed an anticorrelation between the HCN/HNC ratio and cosmic-ray ionization rate.

ASTROPHYSICAL JOURNAL (2022)

Article Astronomy & Astrophysics

H13CN-HN13C Intensity Ratio as a Temperature Indicator of Interstellar Clouds

A. G. Pazukhin et al.

Summary: This study used the IRAM radio telescope to observe star forming regions and found a correlation between molecular line ratios and kinetic temperature. The study proposes the use of (HCN)-C-13-(HNC)-C-13 intensity ratio as a potential temperature indicator for interstellar clouds.

ASTRONOMY REPORTS (2022)

Article Astronomy & Astrophysics

Detection of the cyanomidyl radical (HNCN): a new interstellar species with the NCN backbone

V. M. Rivilla et al.

Summary: The study reports the first detection of the cyanomidyl radical (HNCN) in the interstellar medium, potentially produced by gas-phase chemistry with a relatively low abundance and high reactivity. This suggests the presence of a plausible precursor of larger prebiotic molecules in interstellar space.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Article Astronomy & Astrophysics

Probing the Chemical Complexity of Amines in the ISM: Detection of Vinylamine (C2H3NH2) and Tentative Detection of Ethylamine (C2H5NH2)

Shaoshan Zeng et al.

Summary: The first interstellar detection of vinylamine and tentative detection of ethylamine were reported in this Letter with derived abundances compared to H-2 as (3.3 +/- 0.4) x 10(-10) and (1.9 +/- 0.5) x 10(-10), respectively. The inferred abundance ratios of C2H3NH2 and C2H5NH2 with respect to methylamine are approximately 0.02 and 0.008. Possible chemical routes for the interstellar synthesis of C2H3NH2 and C2H5NH2 were discussed based on recent chemical and laboratory studies.

ASTROPHYSICAL JOURNAL LETTERS (2021)

Article Astronomy & Astrophysics

Thiols in the Interstellar Medium: First Detection of HC(O)SH and Confirmation of C2H5SH

Lucas F. Rodriguez-Almeida et al.

Summary: Compounds with thiol groups are crucial in the polymerization of amino acids in prebiotic studies. We have detected various thiol compounds in interstellar space, with different abundances. The ratios of thiol-bearing species to their alcohol analogs show similar trends in increasing complexity.

ASTROPHYSICAL JOURNAL LETTERS (2021)

Article Astronomy & Astrophysics

Interstellar detection of the simplest aminocarbyne H2NC: an ignored but abundant molecule

C. Cabezas et al.

Summary: The study reports the first identification of H2NC in space, an isomer of H2CN, with detailed observations in cold dark clouds. The abundance ratio of H2NC/H2CN varies in different clouds, suggesting potential production mechanisms involving N+CH3 and C+NH3 reactions. Further research is required to understand the chemistry behind H2NC and the implications of its ratio with H2CN in different interstellar environments.

ASTRONOMY & ASTROPHYSICS (2021)

Article Astronomy & Astrophysics

A study of submillimeter methanol absorption toward PKS 1830-211: Excitation, invariance of the proton-electron mass ratio, and systematics

S. Muller et al.

Summary: The study conducted an extensive analysis of methanol absorption lines in the high-redshift object PKS 1830-211, revealing methanol only detected in one line of sight and indicating cool and dense methanol gas. The results showed no evidence of variations in the proton-electron mass ratio mu and emphasized the importance of considering systematics in future studies aiming to test Delta mu/mu below the 10(-7) horizon.

ASTRONOMY & ASTROPHYSICS (2021)

Article Astronomy & Astrophysics

First detection of C2H5NCO in the ISM and search of other isocyanates towards the G+0.693-0.027 molecular cloud

L. F. Rodriguez-Almeida et al.

Summary: This study focused on the detection of new isocyanates in the interstellar medium, with a specific emphasis on ethyl isocyanate (C2H5NCO) and vinyl isocyanate (C2H3NCO). Results showed the relative abundance of C2H5NCO and H2NCO+ in the ISM, along with the decreasing trend in relative abundance from simpler isocyanates to more complex ones.

ASTRONOMY & ASTROPHYSICS (2021)

Article Multidisciplinary Sciences

Discovery in space of ethanolamine, the simplest phospholipid head group

Victor M. Rivilla et al.

Summary: Cell membranes, crucial for life, are composed of phospholipids. The presence of ethanolamine in space suggests its potential role in the assembly of primitive membranes on early Earth.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2021)

Article Astronomy & Astrophysics

The first steps of interstellar phosphorus chemistry

J. Chantzos et al.

ASTRONOMY & ASTROPHYSICS (2020)

Article Astronomy & Astrophysics

HCN-to-HNC intensity ratio: a new chemical thermometer for the molecular ISM

A. Hacar et al.

ASTRONOMY & ASTROPHYSICS (2020)

Article Astronomy & Astrophysics

New molecular species at redshift z=0.89

B. Tercero et al.

ASTRONOMY & ASTROPHYSICS (2020)

Article Astronomy & Astrophysics

Cloud-cloud collision as drivers of the chemical complexity in Galactic Centre molecular clouds

S. Zeng et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2020)

Article Astronomy & Astrophysics

Prebiotic Precursors of the Primordial RNA World in Space: Detection of NH2OH

Victor M. Rivilla et al.

ASTROPHYSICAL JOURNAL LETTERS (2020)

Article Astronomy & Astrophysics

A particular carbon-chain-producing region: L1489 starless core

Yuefang Wu et al.

ASTRONOMY & ASTROPHYSICS (2019)

Article Astronomy & Astrophysics

Abundant Z-cyanomethanimine in the interstellar medium: paving the way to the synthesis of adenine

V. M. Rivilla et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2019)

Article Astronomy & Astrophysics

Nitrogen and hydrogen fractionation in high-mass star-forming cores from observations of HCN and HNC

L. Colzi et al.

ASTRONOMY & ASTROPHYSICS (2018)

Article Astronomy & Astrophysics

Complex organic molecules in the Galactic Centre: the N-bearing family

S. Zeng et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2018)

Article Astronomy & Astrophysics

Nitrogen and hydrogen fractionation in high-mass star-forming cores from observations of HCN and HNC

L. Colzi et al.

ASTRONOMY & ASTROPHYSICS (2018)

Article Astronomy & Astrophysics

Phosphorus-bearing molecules in the Galactic Center

V. M. Rivilla et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2018)

Article Physics, Atomic, Molecular & Chemical

The Cologne Database for Molecular Spectroscopy, CDMS, in the Virtual Atomic and Molecular Data Centre, VAMDC

Christian P. Endres et al.

JOURNAL OF MOLECULAR SPECTROSCOPY (2016)

Article Astronomy & Astrophysics

THE SPATIAL DISTRIBUTION OF COMPLEX ORGANIC MOLECULES IN THE L1544 PRE-STELLAR CORE

Izaskun Jimenez-Serra et al.

ASTROPHYSICAL JOURNAL LETTERS (2016)

Article Astronomy & Astrophysics

Discovery of interstellar ketenyl (HCCO), a surprisingly abundant radical

Marcelino Agundez et al.

ASTRONOMY & ASTROPHYSICS (2015)

Article Astronomy & Astrophysics

Discovery of interstellar ketenyl (HCCO), a surprisingly abundant radical

Marcelino Agundez et al.

ASTRONOMY & ASTROPHYSICS (2015)

Article Astronomy & Astrophysics

THE C(3P) + NH3 REACTION IN INTERSTELLAR CHEMISTRY. I. INVESTIGATION OF THE PRODUCT FORMATION CHANNELS

Jeremy Bourgalais et al.

ASTROPHYSICAL JOURNAL (2015)

Article Astronomy & Astrophysics

THE HCN/HNC ABUNDANCE RATIO TOWARD DIFFERENT EVOLUTIONARY PHASES OF MASSIVE STAR FORMATION

Mihwa Jin et al.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2015)

Article Astronomy & Astrophysics

THE HNC/HCN RATIO IN STAR-FORMING REGIONS

Dawn M. Graninger et al.

ASTROPHYSICAL JOURNAL (2014)

Article Astronomy & Astrophysics

The interstellar gas-phase chemistry of HCN and HNC

Jean-Christophe Loison et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2014)

Article Astronomy & Astrophysics

The UMIST database for astrochemistry 2012

D. McElroy et al.

ASTRONOMY & ASTROPHYSICS (2013)

Article Chemistry, Physical

H2CN+ and H2CNH+: New insight into the structure and dynamics from mass-selected threshold photoelectron spectra

Fabian Holzmeier et al.

JOURNAL OF CHEMICAL PHYSICS (2013)

Article Astronomy & Astrophysics

Neutral production of hydrogen isocyanide (HNC) and hydrogen cyanide (HCN) in Titan's upper atmosphere

E. Hebrard et al.

ASTRONOMY & ASTROPHYSICS (2012)

Article Astronomy & Astrophysics

A KINETIC DATABASE FOR ASTROCHEMISTRY (KIDA)

V. Wakelam et al.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2012)

Article Astronomy & Astrophysics

Multiline spectral imaging of dense cores in the Lupus molecular cloud

M. Benedettini et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2012)

Article Astronomy & Astrophysics

Hydrogenation of solid hydrogen cyanide HCN and methanimine CH2NH at low temperature

P. Theule et al.

ASTRONOMY & ASTROPHYSICS (2011)

Article Chemistry, Physical

Matrix Infrared Spectra and Density Functional Calculations of the H2CCN and H2CNC Radicals Produced from CH3CN

Han-Gook Cho et al.

JOURNAL OF PHYSICAL CHEMISTRY A (2011)

Article Astronomy & Astrophysics

The CO luminosity and CO-H2 conversion factor of diffuse ISM: does CO emission trace dense molecular gas?

H. S. Liszt et al.

ASTRONOMY & ASTROPHYSICS (2010)

Article Astronomy & Astrophysics

The rotational excitation of HCN and HNC by He: new insights on the HCN/HNC abundance ratio in molecular clouds

E. Sarrasin et al.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2010)

Article Astronomy & Astrophysics

The Galactic center: The largest oxygen-bearing organic molecule repository

M. A. Requena-Torres et al.

ASTROPHYSICAL JOURNAL (2008)

Article Astronomy & Astrophysics

Tracing shocks and photodissociation in the galactic center region

Sergio Martin et al.

ASTROPHYSICAL JOURNAL (2008)

Article Chemistry, Physical

The reaction of nitrogen atoms with methyl radicals: Are spin-forbidden channels important?

Alvaro Cimas et al.

JOURNAL OF PHYSICAL CHEMISTRY A (2006)

Article Astronomy & Astrophysics

Organic molecules in the Galactic center -: Hot core chemistry without hot cores

M. A. Requena-Torres et al.

ASTRONOMY & ASTROPHYSICS (2006)

Article Astronomy & Astrophysics

Comparative chemistry of diffuse clouds - V. Ammonia and formaldehyde

HS Liszt et al.

ASTRONOMY & ASTROPHYSICS (2006)

Article Astronomy & Astrophysics

Deuterated thioformaldehyde in the Barnard 1 cloud

N Marcelino et al.

ASTROPHYSICAL JOURNAL (2005)

Article Chemistry, Physical

Theoretical investigation of reaction mechanism for CH2(X3B1) with NO radical

WC Zhang et al.

JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM (2004)

Article Astronomy & Astrophysics

Comparative chemistry of diffuse clouds II.: CN, HCN, HNC, CH3CN & N2H+

H Liszt et al.

ASTRONOMY & ASTROPHYSICS (2001)

Article Astronomy & Astrophysics

A study of the physics and chemistry of L134N

JE Dickins et al.

ASTROPHYSICAL JOURNAL (2000)