Simon P. Ellingsen

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How do methanol masers manage to appear in the youngest star vicinities and isolated molecular clumps? Abstract. General characteristics of methanol (CH3OH) maser emission are summarized. It is shown that methanol maser sources are concentrated in the spiral arms. Most of the methanol maser sources from the Perseus arm are associated with embedded stellar(More)
We present the first VLBI maps of H 2 O maser emission (λ1.3 cm) in the nucleus of the Circinus Galaxy, constructed from data obtained with the Australia Telescope Long Baseline Array. The maser emission traces a warped, edge-on accretion disk between radii of 0.11 ± 0.02 and ∼ 0.40 pc, as well as a wide-angle outflow that extends up to ∼ 1 pc from the(More)
An investigation of the spectral energy distribution (SED) of the compact steep-spectrum (CSS) source and possible radio-loud narrow-line Seyfert 1 galaxy (NLS1), PKS 2004–447, is presented. Five out of six well-studied radio-loud NLS1 share this dual classification (optically defined as a NLS1 with radio definition of a CSS or giga-hertz peaked spectrum(More)
Multibeam Maser Survey of methanol and excited OH in the Magellanic Clouds: new detections and maser abundance estimates. ABSTRACT We present the results of the first complete survey of the Large and Small Magellanic Clouds for 6668-MHz methanol and 6035-MHz excited-state hydroxyl masers. In addition to the survey, higher-sensitivity targeted searches(More)
The results of the first complete survey for 6668-MHz CH3 OH and 6035-MHz excited-state OH masers in the Small and Large Magellanic Clouds are presented. A new 6668-MHz CH3 OH maser in the Large Magellanic Cloud has been detected towards the star-forming region N 160a, together with a new 6035-MHz excited-state OH maser detected towards N 157a. We also(More)
A new 7-beam 6−7 GHz receiver has been built to survey the Galaxy and the Magel-lanic Clouds for newly forming high-mass stars that are pinpointed by strong methanol maser emission at 6668 MHz. The receiver was jointly constructed by Jodrell Bank Observatory (JBO) and the Australia Telescope National Facility (ATNF) and allows simultaneous coverage at 6668(More)
A sensitive search for 6.7–GHz methanol maser emission has been made towards 10 galaxies that have yielded detectable microwave molecular–line transitions. These include several which show OH megamaser or superluminous H 2 O maser emission. Within the Galaxy, CH 3 OH and OH masers often occur in the same star formation regions and, in most cases, the CH 3(More)
We have used the Australia Telescope Compact Array (ATCA) to search for 6.7-GHz methanol maser emission towards 87 galaxies. We chose the target sources using several criteria, including far-IR luminosities and the presence of known OH megamasers. In addition, we searched for methanol masers in the nearby starburst galaxy NGC 253, making a full(More)