15 papers · 1 filter
Molecular tori in AGN: a search using excited states of OH
C. M. Violette Impellizzeri, Alan L. Roy, Christian Henkel
One of the fundamental concepts in the unified scheme of AGN is that both Seyfert 1 and Seyfert 2 galaxies harbour supermassive nuclear engines blocked from direct view by an optic…
Chemical evolution in the environment of intermediate mass young stellar objects: NGC7129--FIRS2 and LkH234
A. Fuente, J. R. Rizzo, P. Caselli +2
We have carried out a molecular survey of the Class 0 IM protostar NGC 7129 -- FIRS 2 (hereafter FIRS 2) and the Herbig Be star LkH 234 with the aim of studying the chemical evo…
Extragalactic water masers in bright IRAS sources
A. Tarchi, C. Henkel, A. B. Peck +3
We report the results of a search for 22 GHz water maser emission in IRAS-bright galaxies, using the 100-m Effelsberg telescope. In particular, we present the details of four new m…
Observations of extragalactic masers in bright IRAS sources
A. Tarchi, C. Henkel, A. B. Peck +2
We report the first results of an ongoing survey at 22 GHz with the 100-m Effelsberg telescope to search for water maser emission in bright IRAS sources. We have detected water vap…
VLBA Observations and Effelsberg Monitoring of a Flaring Water Maser in Mrk 348
A. B. Peck, H. Falcke, C. Henkel +1
We report on single-dish monitoring as well as extremely high angular resolution observations of the flaring H2O maser in the Seyfert 2 galaxy Mrk 348. The H2O line is redshifted b…
A Flaring Megamaser in Mrk 348
A. B. Peck, H. Falcke, C. Henkel +4
We report new observations of the H2O megamaser in the Seyfert 2 galaxy Mrk 348. Following our initial detection in 2000 March using the Effelsberg 100 m telescope, re-analysis of…