منابع مشابه
Zeeman 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 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 کاملExtragalactic Zeeman Detections in Oh Megamasers
We have measured the Zeeman splitting of OH megamaser emission at 1667 MHz from five (ultra)luminous infrared galaxies ([U]LIRGs) using the 305 m Arecibo telescope and the 100 m Green Bank Telescope. Five of eight targeted galaxies show significant Zeeman-splitting detections, with 14 individual masing components detected and line-of-sight magnetic field strengths ranging from ≃ 0.5 − 18 mG. Th...
متن کاملOH megamasers , starburst and AGN activity in Markarian 231
We present MERLIN observations of OH maser and radio continuum emission within a few hundred pc of the core of the Ultra Luminous IR Galaxy Markarian 231. This is the only known OH megamaser galaxy classed as a Seyfert 1. Maser emission is identified with the 1665and 1667-MHz transitions over a velocity extent of 720 km s. Both lines show a similar position-velocity structure including a gradie...
متن کاملA 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...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1998
ISSN: 1539-2996
DOI: 10.1017/s1539299600019249