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- W137488349 abstract "We present Very Long Baseline Array (VLBA) HI absorption observations of the core region of the powerful radio galaxy Cygnus A. These data show both broad (FWHM = 244 pm 22 km/s) and narrow (FWHM 10^{4} cm^{-3} and a total column density in the range 10^{23}-10^{24} cm^{-2}; we cannot however determine whether it is primarily an atomic or molecular phase. We find that this gas component does not cover the radio core in Cygnus A and therefore does not contribute to the total gas column that blocks our view of the hidden quasar nucleus. If however we were observing Cygnus A from a different direction it could add significantly. This implies that in some radio galaxies gas on ~100 pc scales may contribute to the obscuration of the central engine. We argue that the circumnuclear torus in Cygnus A contains too little mass to power the AGN over >10^{7} yr but that material in the outer HI absorbing gas disk can provide a reservoir to fuel the AGN and replenish torus clouds. The second narrow HI absorption component is significantly redshifted (by 180 km/s) with respect to the systemic velocity and probably traces infalling gas which will ultimately fuel the source. This component could arise either within a tidal tail structure associated with a recent (minor) merger or be associated with an observed infalling giant molecular cloud." @default.
- W137488349 created "2016-06-24" @default.
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- W137488349 date "2009-10-29" @default.
- W137488349 modified "2023-09-27" @default.
- W137488349 title "An atomic circumnuclear disk in Cygnus A" @default.
- W137488349 hasPublicationYear "2009" @default.
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