Search Publications
Polycyclic aromatic hydrocarbons in Seyfert and star-forming galaxies
Rigopoulou, D.; Pereira-Santaella, M.; Alonso-Herrero, A. +3 more
Polycyclic Aromatic Hydrocarbons (PAHs) are carbon-based molecules resulting from the union of aromatic rings and related species, which are likely responsible for strong infrared emission features. In this work, using a sample of 50 Seyfert galaxies (DL < 100 Mpc) we compare the circumnuclear (inner kpc) PAH emission of AGN to that …
The Nearby Evolved Stars Survey II: Constructing a volume-limited sample and first results from the James Clerk Maxwell Telescope
Kim, J.; Menten, K. M.; Marshall, J. P. +89 more
The Nearby Evolved Stars Survey (NESS) is a volume-complete sample of ~850 Galactic evolved stars within 3 kpc at (sub-)mm wavelengths, observed in the CO J = (2-1) and (3-2) rotational lines, and the sub-mm continuum, using the James Clark Maxwell Telescope and Atacama Pathfinder Experiment. NESS consists of five tiers, based on distances and dus…
Orion Bar as a window to the evolution of PAHs
Kirsanova, Maria S.; Boley, Paul A.; Murga, Maria S. +1 more
We investigate the mid-infrared (IR) emission in the Orion Bar photodissociation region (PDR), using archival photometric and spectroscopic observations from the United Kingdom Infrared Telescope (UKIRT), Spitzer, Infrared Space Observatory(ISO), and Stratospheric Observatory for Infrared Astronomy (SOFIA) telescopes. Specifically, we consider flu…
Characterizing the PAH emission in the Orion Bar
Tielens, A. G. G. M.; Peeters, E.; Vacca, W. D. +1 more
We present 5-14 $\mu$m spectra at two different positions across the Orion Bar photodissociation region (PDR) obtained with the Infrared Spectrograph onboard the Spitzer Space Telescope and 3.3 $\mu$m PAH observations obtained with the Stratospheric Observatory for Infrared Astronomy (SOFIA). We aim to characterize emission from Polycyclic Aromati…
Probing computational methodologies in predicting mid-infrared spectra for large polycyclic aromatic hydrocarbons
Rigopoulou, D.; García-Bernete, I.; Roche, P. F. +3 more
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 methodologies. We employ classical mechanics methods (Amber and Gaff) with improved atomic point charges, semi-empirical (PM3, and density…
Polycyclic Aromatic Hydrocarbon emission model in photodissociation regions - I. Application to the 3.3, 6.2, and 11.2 µm bands
Cami, Jan; Tielens, A. G. G. M.; Peeters, Els +1 more
We present a charge distribution based model that computes the infrared spectrum of polycyclic aromatic hydrocarbon (PAH) molecules using recent measurements or quantum chemical calculations of specific PAHs. The model is applied to a sample of well-studied photodissociation regions (PDRs) with well-determined physical conditions (the radiation fi…