Mathematics – Logic
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..442d&link_type=abstract
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,
Mathematics
Logic
Scientific paper
Central black hole masses for 117 spiral galaxies representing morphological stages S0/a through Sc and taken from the large spectroscopic survey of teauthor{Ho1997} teyearpar{Ho1997} are derived using 2MASS K_{s} data. Black hole (BH) masses are found using a calibrated black-hole mass-K_{s} bulge luminosity relation, while bulge luminosities are measured using a two-dimensional bulge/disk decomposition routine.
The BH masses are correlated against a variety of nuclear and host-galaxy properties. Nuclear properties such as line width and line ratios show a very high degree of correlation with BH mass. The excellent correlation with line width supports the view that the emission-line gas is in virial equilibrium with either the BH or bulge potential. The very good emission-line ratio correlations may indicate a change in ionizing continuum shape with BH mass in the sense that more massive BHs generate harder spectra.
Apart from the inclination-corrected rotational velocity, no excellent correlations are found between BH mass and host-galaxy properties.
Significant differences are found between the distributions of BH masses in early (S0/a, Sa), middle (Sab-Sbc) and later (Sc) type spiral galaxies in the sense that early-type galaxies have preferentially larger central BHs. The line-width distributions show a marked difference among the sub-samples in the sense that earlier-type galaxies have larger line widths. There are also clear differences in line ratios between sub-samples likely related to the level of ionization in the gas.
Finally, a K_{s}-band Simien & de Vaucouleurs diagram shows excellent agreement with the original B-band relation.
de Robertis Michael M.
Dong Xiao-Yi
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