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2025ApJ...989L..51N - Astrophys. J., 989, L51 (2025/August-3)

The Discovery of 25 μm Interstellar Methanol.

NICKERSON S.L., RANGWALA N., SUNG K., HUANG X., MONTIEL E.J., DEWITT C., LE GOUELLEC V.J.M., COLGAN S.W.J., DITTMANN J., FONFRIA J.P., HARPER G.M., KRAEMER K.E., LI J., NIXON C.A., RASHMAN M.F., SOUSA-SILVA C., TIELENS A.G.G.M. and VACCA W.D.

Abstract (from CDS):

We present the first astrophysical detection of methanol (CH3OH) in the torsional band near 25 μm. Using high-resolution mid-infrared (MIR) spectroscopy, we identified over 70 gas-phase CH3OH absorption lines between 20 and 28 μm toward the massive protostar NGC 7538 IRS 1 with the Stratospheric Observatory for Infrared Astronomy/Echelon-Cross-Echelle Spectrograph. We derive a temperature of 180 K and a total column density of 2 × 1017 cm–2, comparable to submillimeter measurements. Complementary analysis of acetylene (C2H2) absorption lines is also included. Both CH3OH and C2H2 reveal an unresolved second velocity component. These MIR absorption lines likely probe the molecular material in two edge-on disks, supporting the scenario that NGC 7538 IRS 1 consists of multiple protostars. We provide an updated line list for the torsional band of CH3OH, which was generated from lab work and model calculations. This discovery and the updated line list will enable the search for CH3OH in JWST/MIRI spectra.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Astrochemistry - Protostars - Star formation - Young stellar objects - Spectral line lists - Molecular spectroscopy - High resolution spectroscopy - Interstellar medium

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 4

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