NGC 7027 Archives

HST/WFC3 NICMOS F212N image of NGC 7027 with JWST MIRI-MRS FOVs for channels 1 (red), 2, and 3 (white) overlaid. The black cross indicates the position of the central star. The yellow contours outline the H2 gas morphology in the continuum-subtracted HST/NICMOS images from Latter et al. (2000). The small orange, pink, blue, and green boxes are the spaxels used to illustrate the AIB variability referred to hereinafter as the E ring, outer NE corner, inner region, and the SW ring, respectively. Credit: NASA/ESA, Latter et al. (2000). -- astro-ph.SR

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report

PAH Spectral Diversity in NGC 7027 and the Evolution of Aromatic Carriers

by Keith CowingOctober 24, 2025October 22, 2025

Polycyclic Aromatic Hydrocarbons (PAHs) constitute a significant fraction of the Universe’s carbon budget, playing a key role in the cosmic carbon cycle and dominating the mid-infrared spectra of astrophysical environments […]

Fractional abundances of PAHs as a function of the number of carbon atoms 𝑁C. Dotted lines denote the estimated abundance upper limits of large quasi-symmetric PAHs in NGC 7027, and these values warrant cautious interpretation (refer to the contextual discussion). The solid curve shows the theoretical prediction from Draine & Lazarian (1998). For comparative analysis, values or upper limits from previous studies are overplotted. -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Status Report

The Missing Giant: Do FAST Spectroscopic Observations Reveal a Scarcity of Large Polycyclic Aromatic Hydrocarbons in Astronomical Environments?

by Keith CowingAugust 23, 2025August 23, 2025

The search for large polycyclic aromatic hydrocarbons (PAHs) with over 100 carbon atoms is crucial to resolving the origin of unidentified infrared emission (UIE) bands.

NGC 7027

PAH Spectral Diversity in NGC 7027 and the Evolution of Aromatic Carriers

The Missing Giant: Do FAST Spectroscopic Observations Reveal a Scarcity of Large Polycyclic Aromatic Hydrocarbons in Astronomical Environments?

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