Polycyclic aromatic hydrocarbons (PAHs) play a critical role in the reprocessing of stellar radiation and in balancing the heating and cooling processes in the interstellar medium (ISM), but appear to […]
PAH
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Press Release
PHANGS-JWST First Results: Tracing the Diffuse ISM with JWST Imaging of Polycyclic Aromatic Hydrocarbon Emission in Nearby Galaxies
JWST observations of polycyclic aromatic hydrocarbon (PAH) emission provide some of the deepest and highest resolution views of the cold interstellar medium (ISM) in nearby galaxies.
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Press Release
Rotational Spectra of Interstellar N- and CN-PAHs: Pyrene and Coronene
The detection of benzonitrile (C6H5CN), 1- and 2-cyano-naphthalene (C10H7CN) in the cold, dark molecular cloud TMC-1 at centimetre (cm) wavelengths has opened up prospects for the detection of other N- […]
Posted inAstrochemistry, Interstellar, Press Release
Polyaromatic Hydrocarbons with an Imperfect Aromatic System as Catalysts of Interstellar H2 Formation
Although H2 is the simplest and the most abundant molecule in the Universe, its formation in the interstellar medium, especially in the photodissociation regions is far from being fully understood.
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Press Release
PAH Emission From Star-forming Galaxies In JWST Mid-infrared Imaging Of The Lensing Cluster SMACS J0723.3−7327
The mid-infrared spectra of star-forming galaxies (SFGs) are characterized by characteristic broad PAH emission features at 3−20 μm.
Posted inAstrochemistry, Press Release
Formation Of c-C6H5CN Ice Using The SPACE TIGER Experimental Setup
Benzonitrile (c-C6H5CN) has been recently detected in cold and dense regions of the interstellar medium (ISM), where it has been used as a signpost of a rich aromatic organic chemistry […]
Posted inAstrochemistry, Press Release
Probing Computational Methodologies In Predicting Mid-infrared Spectra For Large Polycyclic Aromatic Hydrocarbons
We extend the prediction of vibrational spectra to large sized polycyclic aromatic hydrocarbon (PAH) molecules comprising up to ~ 1500 carbon atoms by evaluating the efficiency of several computational chemistry […]
Posted inAstrochemistry, Press Release
A High Angular Resolution View Of The PAH Emission In Seyfert Galaxies Using JWST/MRS Data
Polycyclic Aromatic Hydrocarbons (PAHs) are carbon-based molecules, which are ubiquitous in a variety of astrophysical objects and environments. In this work, we use JWST/MIRI MRS spectroscopy of 3 Seyferts to […]
Posted inAstrochemistry, Astronomy & Telescopes, Press Release
Contribution of Polycyclic Aromatic Hydrocarbon Ionization To Neutral Gas Heating In Galaxies
The ionization of polycyclic aromatic hydrocarbons (PAHs), by ultraviolet (UV) photons from massive stars is expected to account for a large fraction of the heating of neutral gas in galaxies. […]
Posted inAstrochemistry, Press Release
Observational Evidence Linking Interstellar UV Absorption to PAH Molecules
The 2175 \AA\ UV extinction feature was discovered in the mid-1960s, yet its physical origin remains poorly understood. One suggestion is absorption by Polycyclic Aromatic Hydrocarbons (PAH) molecules, which is […]