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Título : High-J v=0 SiS Maser Emission in IRC+10216: A New Case of Infrared Overlaps
Autor : Fonfría, José Pablo ; Agúndez, Marcelino; Tercero, Belén ; Pardo Carrión, Juan Ramón ; Cernicharo, José
Palabras clave : Circumstellar matter
Masers
Stars: Asymptotic Giant Branch (AGB) and post-AGB
Stars: carbon
Fecha de publicación : 9-oct-2007
Citación : The Astrophysical Journal Letters, 646, 127 (2006)
arXiv:0710.1836v1
Resumen: 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 C-rich star IRC+10216. These masers seem to be produced in the very inhomogeneous region between the star and the inner dust formation zone, placed at 5-7 R*, with expansion velocities below 10 km/s. We interpret the pumping mechanism as due to overlaps between v=1-0 ro-vibrational lines of SiS and mid-IR lines of C2H2, HCN and their 13C isotopologues. The large number of overlaps found suggests the existence of strong masers for high-J v=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.
URI : http://hdl.handle.net/10261/2610
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