Abstract
view Abstract Citations (56) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectral Line Profiles and Luminosities of Astrophysical Water Masers Nedoluha, Gerald E. ; Watson, William D. Abstract The spectral line narrowing and rebroadening that occurs for astrophysical masers as a function of the emergent radiative flux is calculated for the prominent, 22 GHz masing transition of water. The increased line breadths due to hyperfine structure lead to reliable, essentially model-independent upper limits to the emergent flux that tend to be lower than other estimates for these masers. For many 22 GHz masers, including the outbursts in W49 and Orion, the observed line breadths are less than 0.9 km/s. For these, the upper limit to the emergent maser flux is 10 to the 10th K-sr when expressed in terms of the brightness temperature and the solid angle for beaming. It is concluded that the extreme brightness of the interstellar water masers is due to a high degree of beaming and not to more effective pumping. Publication: The Astrophysical Journal Pub Date: February 1991 DOI: 10.1086/185932 Bibcode: 1991ApJ...367L..63N Keywords: Interstellar Masers; Luminosity; Spectral Line Width; Water Masers; Brightness Temperature; Circular Polarization; Computational Astrophysics; Interstellar Magnetic Fields; Astrophysics; LINE PROFILES; MASERS full text sources ADS |
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