A systematic search for OH megamasers
نویسندگان
چکیده
منابع مشابه
A Search for OH Megamasers at z> 0.1: Preliminary Results
We report the discovery of 11 OH megamasers and one OH absorber, along with upper limits on the OH luminosity of 53 other luminous infrared galaxies at z > 0.1. The new megamasers show a wide range of spectral properties, but are consistent with the extant set of 55 previously reported objects, 8 of which have z > 0.1. The new OH detections are the preliminary results of a OH megamaser survey i...
متن کاملA Dense Gas Trigger for Oh Megamasers
HCN and CO line diagnostics provide new insight into the OH megamaser (OHM) phenomenon, suggesting a dense gas trigger for OHMs. We identify three physical properties that differentiate OHM hosts from other starburst galaxies: (1) OHMs have the highest mean molecular gas densities among starburst galaxies; nearly all OHM hosts have n̄(H2) = 103–104 cm−3 (OH line-emitting clouds likely have n(H2)...
متن کاملZeeman splitting in OH megamasers
We detected significant Zeeman splitting in the 1667MHz OH megamaser emission from four ultraluminous galaxies. These detections, in addition to being the first extragalactic detection of the Zeeman effect in an emission line, suggest that OH megamasers are excellent extragalactic magnetometers.
متن کاملA Search for OH Megamasers at z> 0.1. I. Preliminary Results
We present the preliminary results of a survey for OH megamasers underway at the Arecibo Observatory . The goals of the survey are to calibrate the luminosity function of OH megamasers to the low-redshift galaxy merger rate (0.1 < z < 0.2), and to use the enhanced sample of OH megamasers provided by the survey to study OHmegamaser environments, engines, lifetimes, and structure. The survey shou...
متن کاملA Search for Oh Megamasers at Z > 0.1. Iii. the Complete Survey
We present the final results from the Arecibo Observatory OH megamaser survey. We discuss in detail the properties of the remaining 18 OH megamasers detected in the survey, including 3 redetections. We place upper limits on the OH emission from 85 nondetections and examine the properties of 25 ambiguous cases for which the presence or absence of OH emission could not be determined. The complete...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1987
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/226.3.689