Título
SPECTRAL OPTICAL MONITORING OF THE NARROW-LINE SEYFERT 1 GALAXY Ark 564
Autor
Vahram Chavushyan
JOSE RAMON VALDES PARRA
CLAUDIA JANET AMPARO TORREALBA GARCIA
Luis Carrasco Bazúa
Nivel de Acceso
Acceso Abierto
Materias
Gglaxies: active - (INSPEC) Galaxies: individual (Ark 564) - (INSPEC) Galaxies: Seyfert– Line: profiles - (INSPEC) Quasars: emission lines - (INSPEC) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI) RADIOASTRONOMÍA - (CTI) PROPAGACIÓN DE ONDAS ELECTROMAGNÉTICAS - (CTI) PROPAGACIÓN DE ONDAS ELECTROMAGNÉTICAS - (CTI)
Resumen o descripción
We present the results of a long-term (1999–2010) spectral optical monitoring campaign of the active galactic nucleus (AGN) Ark 564, which shows a strong Fe ιι line emission in the optical. This AGN is a narrow-line Seyfert 1 (NLS1) galaxy, a group of AGNs with specific spectral characteristics. We analyze the light curves of the permitted Hα, Hβ, optical Fe ιι line fluxes, and the continuum flux in order to search for a time lag between them. Additionally, in order to estimate the contribution of iron lines from different multiplets, we fit the Hβ and Fe ιιlines with a sum of Gaussian components. We find that during the monitoring period the spectral variation (Fmax/Fmin) of Ark 564 is between 1.5 for Hα and 1.8 for the Fe ιιlines. The correlation between the Fe ιιand Hβ flux variations is of higher significance than that of Hα and Hβ (whose correlation is almost absent). The permitted-line profiles are Lorentzian-like and do not change shape during the monitoring period. We investigate, in detail, the optical Fe ιιemission and find different degrees of correlation between the Fe ιιemission arising from different spectral multiplets and the continuum flux. The relatively weak and different degrees of correlations between permitted lines and continuum fluxes indicate a rather complex source of ionization of the broad-line emission region.
Editor
The Astrophysical Journal Supplement Series
Fecha de publicación
septiembre de 2012
Tipo de publicación
Artículo
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Audiencia
Estudiantes
Investigadores
Público en general
Sugerencia de citación
Shapovalova, A. I., et al., (2012), SPECTRAL OPTICAL MONITORING OF THE NARROW-LINE SEYFERT 1 GALAXY Ark 564, The Astrophysical Journal Supplement Series, Vol. 202(1):1-22
Repositorio Orígen
Repositorio Institucional del INAOE
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