We present our most recent observations in the M-band, ranging from 4.4 to 5.1 micron, of the central parsec of the Galaxy, obtained with the ISAAC spectrograph of the VLT. These observations resulted in unprecedented high quality spectra of the brightest sources of the central parsec which allow us to analyse the spatial distribution, locally and along the line of sight, of the solid and gaseous phase of the CO molecule.

https://iopscience.iop.org/article/10.1088/1742-6596/54/1/010/pdf

ISAAC M-band spectroscopy of dust embedded sources at the Galactic Center

High-resolution spectroscopy of bright infrared sources in the centre of the Galaxy has resulted in the detection of in a remarkable array of dense and diffuse clouds along the 8000 parsec long line of sight, at a wide range of distances from the centre. Most prominent among these is a previously undetected, but very large amount of warm ( T ∼250 K) and diffuse ( n ∼100 cm 2 ) gas within a few hundred parsecs of the centre. The key to understanding the environment of the in this region is an absorption line at 3.53 μm from the metastable (3,3) rotational level, which has not been detected in dense or diffuse clouds outside of the Galactic centre (GC). We have used spectroscopy of this line along with other lines of and CO to characterize all of the clouds along the line of sight to the GC. The high abundance of in the central few hundred parsecs implies an ionization rate there that is several times larger than estimated for diffuse clouds outside the GC, and nearly two orders of magnitude greater than originally predicted for diffuse clouds.

towards and within the Galactic centre

Les spectres d'absorption IR a haute resolution de plusieurs sources IR du Centre Galactique ont ete obtenus a 4,64 μm autour de la transition de vibration-rotation de CO. Les profils en absorption revelent la presence d'un certain nombre de nuages interstellaires individuels dont les vitesses sont estimees

/pdf/carbon-monoxide-along-the-line-of-sight-to-galactic-center-33vfwcpaxu.pdf

Carbon monoxide along the line of sight to galactic center infrared sources

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Carbon monoxide along the line of sight to galactic center infrared sources