|The Australia Telescope National Facility Colloquium|
|15:00-16:00 Fri 01 Nov 2013|
Liz Humphreys Colloquium -- Probing inner NGC 4258: Warped, Unstable and Eccentric?
Nearby AGN NGC 4258 displays strong 22 GHz water maser emission, which enables mapping of a circumnuclear disk at the 40 000 Schwarzschild radius level (within 1 pc of the supermassive black hole). In this talk, I will discuss how we have used the masers to investigate the Unified Model for AGN. I will also describe how we have used the masers to make a new, high-accuracy geometric distance measurement to the galaxy. With this measurement, we have re-anchored the extragalactic distance scale of Riess et al. (2011) and obtain a Hubble constant of 72.0 +/- 3.0 km/s/Mpc.
This loads a font easier to read for people with dyslexia.
This renders the document in high contrast mode.
This renders the document as white on black
This can help those with trouble processing rapid screen movements.