Computer Science
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3461t&link_type=abstract
ATNF proposal T196, Semester: October, 2010
Computer Science
Masers (Galactic And Extragalactic), Active Galactic Nuclei / Quasars, Parkes
Scientific paper
Providing bright, almost point like hotspots, water masers are a powerful tool to investigate the structure and dynamics of the emitting gas, because they can be mapped at submilliarcsecond resolution using VLBI. In particular, detailed studies of luminous water masers in AGN provide constraints on the accretion disk geometry, estimates of black-hole masses and of the distance to parent galaxies. Since, so far, detection rates of water maser searches have been disappointingly low, increasing the number of such sources is highly desirable. Here, we propose to observe with The 70-m Tidbinbilla a complete sample of southern AGN selected in the hard X-ray band between 20 and 40 keV from INTEGRAL/IBIS observations, in a search for water maser emission at 22 GHz. Our selection criterion is supported by recent observational evidences indicating the existence of a correlation between hard X-ray emission and the water maser phenomenon. Together with providing new maser sources, this study will also allow us to investigate, on a firm statistical basis, the interplay between hard X-ray and maser emission in AGN.
Castangia Paola
Horiuchi Shinji
Panessa Francesca
Tarchi Andrea
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