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J/other/RMxAA/47.361 AGN activity in isolated SDSS galaxies (Coziol+, 2011)
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Beginning of ReadMe :J/other/RMxAA/47.361 AGN activity in isolated SDSS galaxies (Coziol+, 2011)
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The nature and origin of Narrow-line AGN Activity in a sample of isolated
SDSS galaxies.
Coziol R., Torres-Papaqui J.P., Plauchu-Frayn I., Islas-Islas J.M.,
Ortega-Minakata R.A., Neri-Larios D.M., Andernach H.
<Rev. Mex. Astron. Astrofis. 47, 361 (2011)>
=2011RMxAA..47..361C
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ADC_Keywords: Galaxies, spectra ; Active gal. nuclei ; Abundances ;
Equivalent widths
Keywords: Galaxies:spectra ; AGN ; Equivalent_widths
Abstract:
We discuss the nature and origin of the nuclear activity observed in
a sample of 292 SDSS narrow-emission-line galaxies, considered to have
formed and evolved in isolation. All these galaxies are spiral like
and show some kind of nuclear activity. The fraction of Narrow Line
AGNs (NLAGNs) and Transition type Objects (TOs; a NLAGN with
circumnuclear star formation) is relatively high, amounting to 64% of
the galaxies. There is a definite trend for the NLAGNs to appear in
early-type spirals, while the star forming galaxies and TOs are found
in later-type spirals. We verify that the probability for a galaxy to
show an AGN characteristic increases with the bulge mass of the galaxy
(Torres-Papaqui et al. 2011), and find evidence that this trend is
really a by-product of the morphology, suggesting that the AGN
phenomenon is intimately connected with the formation process of the
galaxies. Consistent with this interpretation, we establish a strong
connection between the astration rate -- the efficiency with which
the gas is transformed into stars - the AGN phenomenon, and the
gravitational binding energy of the galaxies: the higher the binding
energy, the higher the astration rate and the higher the probability
to find an AGN. The NLAGNs in our sample are consistent with
scaled-down or powered-down versions of quasars and Broad Line AGNs.