Cyano-substituted polycyclic aromatic hydrocarbons (CN-PAHs) may contribute to the emission detected in the 7 – 9 μm (1430 – 1100 cm−1) and 11 – 15 μm (900 – 670 cm−1) […]
![Left: An example of PSF matching between the [O III] λ5007 PNB image from Keck/KCWI (top-left) and the [O III] 88 µm PNB image from Herschel/PACS (bottom-left). The KCWI PNB image has been convolved with a 2D Gaussian kernel (top-right) to match the PACS PNB image’s PSF. The resulting residual is shown in the bottom-right panel. The red dashed circles indicate the apertures from which the 1D spectra were extracted. Right: Modeling of dust attenuation based on the observed flux ratios of hydrogen Balmer and Paschen lines. In the top panel, the data points represent the correction factors needed to align the observed flux ratios with those predicted by Case B recombination. The best-fit attenuation models are represented by solid curves, while the shaded areas denote their 1σ uncertainties. The blue (orange) color indicates the 1D spectra before (after) PSF matching. The steep slope at the lower wavelengths is primarily due to contributions from stellar absorption. The lower panel shows the fractional deviations between the observed and best-fit flux ratios, for the same data points. Data points near unity indicate a good agreement with the attenuation model. -- astro-ph.GA](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/06/Robust-Nitrogen-and-Oxygen.png?resize=1200%2C717&ssl=1)
Accurate chemical compositions of star-forming regions are a critical diagnostic tool to characterize the star formation history and gas flows which regulate galaxy formation.
We investigate the role of carbon monoxide ice in the chemical evolution of prestellar cores using astrochemical rate equation models.
Featured in this new image from the NASA/ESA/CSA James Webb Space Telescope is the dwarf galaxy NGC 4449. This galaxy, also known as Caldwell 21, resides roughly 12.5 million light-years […]
Deuterium fractionation in the closest vicinity of a protostar is important in understanding its potential heritage to a planetary system.
Infrared emission features toward interstellar gas of the IC 348 star cluster in Perseus have been recently proposed to originate from the amino acid tryptophan.
Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous component of the interstellar medium (ISM) in z~0 massive, star-forming galaxies and play key roles in ISM energy balance, chemistry, and shielding.
For the last century, the source of sulfur in Earth’s very first organisms has remained a fundamental, unsolved enigma.
Imidogen (NH) is a reactive molecule whose presence in astrochemical environments is of interest due to its role in the formation of nitrogen-containing molecules and as a potential probe of […]
High-resolution observations show that typically both the dust and the gas in nearby extended protoplanetary disks are structured, possibly related to radial and azimuthal variations in the disk density and/or […]
