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Revista mexicana de astronomía y astrofísica
Print version ISSN 0185-1101
Rev. mex. astron. astrofis vol.47 n.2 Ciudad de México Oct. 2011
The Nature And Origin of Narrow Line AGN Activity in a Sample of Isolated SDSS Galaxies
R. Coziol,1 J. P. TorresPapaqui1 I. PlauchuFrayn,2 J. M. IslasIslas,1 R. A. OrtegaMinakata,1 D. M. NeriLarios,1 and H. Andernach1
1 Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, 36000 Guanajuato, Guanajuato, México (heinz, coziol, jmislas, daniel, rene, papaqui@astro.ugto.mx).
2 Instituto de Astrofísica de Andalucía (CSIC), E18008, Granada, Spain (ilse@iaa.ee).
Received 2011 May 26
Accepted 2011 August 1
RESUMEN
Discutimos la naturaleza y origen de la actividad nuclear observada en una muestra de 292 galaxias con líneas de emisión angostas del SDSS, cuya formación y evolución se considera que ha ocurrido en aislamiento. La fracción de galaxias con un núcleo activo (AGNs) o de objetos de transición (TOs; un AGN con formación estelar circunnuclear) alcanza 64% de la muestra. Verificamos que la probabilidad de que una galaxia muestre un nuócleo activo aumenta con la masa de su bulbo (TorresPapaqui et al. 2011). También encontramos evidencia de que dicha tendencia es realmente un subproducto de la morfología, y sugiere que el fenómeno AGN está íntimamente ligado al proceso de formación de galaxias. Los AGNs con líneas de emisión angostas en nuestra muestra son consistentes con una versión a menor escala o menor energía de cuásares y AGNs con líneas de emisión anchas.
ABSTRACT
We discuss the nature and origin of the nuclear activity observed in a sample of 292 SDSS narrowemissionline 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 (TorresPapaqui et al. 2011), and find evidence that this trend is really a byproduct 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 scaleddown or powereddown versions of quasars and Broad Line AGNs.
Key Words: galaxies: active — galaxies: formation.
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