ALMA Atacama Compact Array Archives

(A)–(D). Spectrally integrated flux maps for HCN on September 12 and 15 and for CH3 on September 18 and October 1. Contour intervals in each map are given in multiples of the rms noise. The rms noise (σ, mJy beam−1 km s−1 ) is indicated in the upper left corner of each panel. Contours are 5σ and 10σ for HCN and for CH3OH on October 1, and 3σ and 5σ for CH3OH on September 18. Sizes and orientations of the synthesized beam (Table A1) are indicated in the lower left corner of each panel. The comet’s observer-centered illumination (ϕSTO ∼ 20◦ ), as well as the direction of the Sun and dust trail, are indicated in the lower right. A spectrum of the HCN (J = 4 − 3) transition from a 10′′ diameter aperture centered on the peak emission is shown in the upper right. The CH

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Interstellar, Status Report

CH3OH and HCN in Interstellar Comet 3I/ATLAS Mapped with the ALMA Atacama Compact Array: Distinct Outgassing Behaviors and a Remarkably High CH3OH/HCN Production Rate Ratio

by Keith CowingDecember 11, 2025December 10, 2025

We report the detection of methanol (CH3OH) toward interstellar comet 3I/ATLAS using the Atacama Compact Array of the Atacama Large Millimeter/Submillimeter Array (ALMA) on UT 2025 August 28, September 18 […]

ALMA Atacama Compact Array

CH3OH and HCN in Interstellar Comet 3I/ATLAS Mapped with the ALMA Atacama Compact Array: Distinct Outgassing Behaviors and a Remarkably High CH3OH/HCN Production Rate Ratio

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