ultraluminous infrared galaxies Archives

PPV plot of the (sub)millimeter HCN-to-HCO+ flux ratios at J=2–1, J=3–2, and J=4–3, with a velocity resolution of 20 km s−1 and a pixel scale of 0. ′′02 pixel−1 for IRAS 00091−0738. The HCN-to-HCO+ flux ratios are calculated in brightness temperature (K). (This is virtually identical to the ratio in flux density (Jy ∝ K × ν 2 ), because the HCN and HCO+ frequencies differ only by a factor of ∼1.006 at the same J transition.) Only data with >3σ detections in emission for both the HCN and HCO+ lines are plotted. The color bar corresponds to 0.285 (blue) to 3.5 (pink) in the same way as Nishimura et al. (2024). Left: All >3σ-detected data. Center : Data with the top 10% ratios. Right: Data with ratios >1.5. East is to the left and west is to the right along the ∆α axis. North is farther and south is nearer along the ∆δ axis. -- astro-ph.GA

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

Spectrally And Spatially Resolved (sub)millimeter HCN-to-HCO+ Flux Ratios In Nearby Ultraluminous Infrared Galaxies

by Keith CowingMay 12, 2026May 12, 2026

We present the results of our investigations of spectrally and spatially resolved (sub)millimeter HCN-to-HCO+ flux ratios at J=2-1, J=3-2, and/or J=4-3 in 18 nearby (z< 0.15) ultraluminous infrared galaxies (ULIRGs), […]

ultraluminous infrared galaxies

Spectrally And Spatially Resolved (sub)millimeter HCN-to-HCO+ Flux Ratios In Nearby Ultraluminous Infrared Galaxies

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Webb Reveals A Stunning Panorama Of Star Formation

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