Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.5706b&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #57.06; Bulletin of the American Astronomical Society, Vol. 30, p.1333
Astronomy and Astrophysics
Astronomy
Scientific paper
Many galactic nuclei host massive black holes, but not all nuclei with black holes are active. To understand if and how the supply of fuel affects a galaxy's activity level, I am conducting a survey with the Owens Valley millimeter array of the cold molecular gas in nine nearby spirals which possess a broad Hα component in their Seyfert or LINER nuclear spectra. I have mapped the sample at arcsecond resolution in the CO(2->1) rotational transition, and at lower resolution in the CO(1->0) transition. The galaxies harbor ~ 10(8 ) M_sun of molecular gas within 500 pc of their nuclei, in disklike structures which are flattened and show strong rotational gradients perpendicular to emergent radio jets and optical ionization cones. The intensity ratios of the two CO lines indicate they have high excitation temperatures and low optical depths in at least some systems. The gas structures also display striking levels of nonaxisymmetry in their mass, excitation, and kinematic properties, and in some cases confirm the absence of a single symmetry axis which is consistent over all scales. I will discuss the roles played by these molecular disks in fueling and obscuring emission from the central black holes, with particular emphasis on the prototypical Seyfert galaxy NGC 1068.
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