The Interstellar Medium toward the Galactic Center Source 2MASS J17470898-2829561
T. R. Geballe, Yvonne Pendleton, Jean Chiar, and Alexander G .G., M.Tielens

TL;DR
This paper presents detailed infrared spectra of a heavily obscured supergiant star in the Galactic Center, revealing unique interstellar medium features and providing insights into the dense environment of the CMZ.
Contribution
It offers the first infrared spectra of 2MASS J17470898-2829561 within Sgr B1, highlighting its role as a probe of the dense interstellar medium in the Galactic Center.
Findings
Detected the strongest H3+ absorption lines toward any object.
Identified deep interstellar CO absorption in dense gas of Sgr B1.
Revealed complex solid-state features indicating diverse dust environments.
Abstract
We describe and discuss remarkable infrared spectra, covering key portions of the m wavelength interval, of the probable OH/IR supergiant 2MASS J174708982829561 (2M1747), located in direction of the Sgr B molecular cloud complex within the Central Molecular Zone (CMZ) of the Galaxy. This star was originally singled out for examination based on its suitability for spectroscopy of lines of H in the CMZ. Analysis of the spectra shows that 2M1747 is deeply embedded within Sgr B1, with A 100 mag, making it the only star within Sgr B for which infrared spectra have been obtained at present, and thereby a unique infrared probe of the dense interstellar medium within the CMZ. Despite the high extinction, spectra of 2M1747 reveal a veiled photosphere in the band and circumstellar gas in the band, giving clues as to its nature. Its m…
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