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The close environment of the central supermassive black hole of our Galaxy isstudied thoroughly since decades in order to shed light on the behavior of thecentral regions of galaxies in general and of active galaxies in particular.The Galactic Center has shown a wealth of structures on different scales with acomplicated mixture of early- and late-type stars, ionized and molecular gas,dust and winds. Here we aim at studying the distribution of water ices andhydrocarbons in the central parsec as well as along the line of sight. Thisstudy is made possible thanks to L-band spectroscopy. This spectral band, from2.8 to 4.2$\mu m$, hosts important signatures of the circumstellar medium andinterstellar dense and diffuse media among which deep absorption features areattributed to water ices and hydrocarbons. We observed the Galactic Center inthe L-band of ISAAC spectrograph located on UT1/VLT ESO telescope. By mappingthe central half parsec using 27 slit positions, we were able to build thefirst data cube of the region in this wavelength domain. Thanks to a calibratorspectrum of the foreground extinction in the L-band derived in a previouspaper, we corrected our data cube for the line of sight extinction andvalidated our calibrator spectrum. The data show that a residual absorption dueto water ices and hydrocarbons is present in the corrected data cube. Thissuggests that the features are produced in the local environment of theGalactic center implying very low temperatures well below 80K. This is inagreement with our finding of local CO ices in the central parsec described inMoultaka et al. (2015).

"Ice cubes" in the center of the Milky Way - Water ice and hydrocarbons in the central parsec