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THE NATURE AND ORIGIN OF NARROW LINE AGN ACTIVITY IN A SAMPLE OF ISOLATED SDSS GALAXIES

REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA Volume: 47 Issue: 2 Pages: 361-383 Published: OCT 2011

Authors:
Coziol, R (Coziol, R.)1; Torres-Papaqui, JP (Torres-Papaqui, J. P.)1; Plauchu-Frayn, I (Plauchu-Frayn, I.)2; Islas-Islas, JM (Islas-Islas, J. M.)1; Ortega-Minakata, RA (Ortega-Minakata, R. A.)1; Neri-Larios, DM (Neri-Larios, D. M.)1; Andernach, H (Andernach, H.)1

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. The fraction of Narrow Line AGNs (NLAGNs) and Transition type Objects (TOs; a NLAGN with circumnuclear star formation) amounts to 64% of the galaxies. 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. The NLAGNs in our sample are consistent with a scaled-down or powered-down versions of quasars and Broad Line AGNs.

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