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- W1996060365 abstract "We present new maser emission from 14NH3 (9,6) in NGC 7538. Our observations include the known spectral features near vLSR = −60 km s−1 and −57 km s−1 and several more features extending to −46 km s−1. In three epochs of observation spanning two months we do not detect any variability in the ammonia masers, in contrast to the >10-fold variability observed in other 14NH3 (9,6) masers in the Galaxy over comparable timescales. We also present observations of water masers in all three epochs for which emission is observed over the velocity range −105 km s−1 < vLSR < −4 km s−1, including the highest velocity water emission yet observed from NGC 7538. Of the remarkable number of maser species in IRS 1, H2O and, now, 14NH3 are the only masers known to exhibit emission outside of the velocity range −62 km s−1 < vLSR < −51 km s−1. However, we find no significant intensity or velocity correlations between the water emission and ammonia emission. We also present a non-detection in the most sensitive search to date toward any source for emission from the CC32S and CC34S molecules, indicating an age greater than ≈104 yr for IRS 1–3. We discuss these findings in the context of embedded stellar cores and recent models of the region." @default.
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- W1996060365 date "2011-11-15" @default.
- W1996060365 modified "2023-09-25" @default.
- W1996060365 title "NEW MASER EMISSION FROM NONMETASTABLE AMMONIA IN NGC 7538. II. GREEN BANK TELESCOPE OBSERVATIONS INCLUDING WATER MASERS" @default.
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- W1996060365 doi "https://doi.org/10.1088/0004-6256/142/6/202" @default.
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