High-J v=0 SiS Maser Emission in IRC+10216: A New Case of Infrared Overlaps
| Autor: | Expósito, J. P. Fonfría, Agúndez, M., Tercero, B., Pardo, J. R., Cernicharo, J. |
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| Rok vydání: | 2007 |
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| Zdroj: | Astrophys.J.646:L127-L130,2006 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1086/507104 |
| Popis: | 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. Comment: 4 pages, 1 figure, published in the ApJ Letters |
| Databáze: | arXiv |
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