High- J [FORMULA][F]v[/F][/FORMULA] = 0 SiS Maser Emission in IRC +10216: A New Case of Infrared Overlaps

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Abstract

We report on the first detection of maser emission in the J=11–10, J=14–13, and J=15–14 transitions of the v=0 vibrational state of SiS toward the carbon-rich star IRC +10216. These masers seem to be produced in the very inhomogeneous region between the star and the inner dust formation zone, located at ~(5–7)R*, with expansion velocities below 10 km/s. We interpret the pumping mechanism as being due to overlaps between v=1–0 rovibrational lines of SiS and mid-IR lines of C2H2, HCN, and their 13C isotopologues. The large number of overlaps found suggest the existence of strong masers for high-Jv=0 and v=1 SiS transitions, located in the submillimeter range. In addition, it could be possible to find several rotational lines of the SiS isotopologues displaying maser emission.

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