SPECTRAL OPTICAL MONITORING OF THE NARROW-LINE SEYFERT 1 GALAXY Ark 564

被引：81

作者：

Shapovalova, A. I. ^{[1
]}

Popovic, L. C. ^{[2
,3
]}

Burenkov, A. N. ^{[1
]}

Chavushyan, V. H. ^{[4
]}

Ilic, D. ^{[3
,5
]}

Kovacevic, A. ^{[3
,5
]}

Kollatschny, W. ^{[6
]}

Kovacevic, J. ^{[2
,3
]}

Bochkarev, N. G. ^{[7
]}

Valdes, J. R. ^{[4
]}

Torrealba, J. ^{[4
]}

Leon-Tavares, J. ^{[8
]}

Mercado, A. ^{[9
]}

Benitez, E. ^{[10
]}

Carrasco, L. ^{[4
]}

Dultzin, D. ^{[10
]}

de la Fuente, E. ^{[11
]}

机构：

[1] Russian AS, Special Astrophys Observ, Nizhnii Arkhyz 369167, Karachaevo Cher, Russia

[2] Astron Observ, Belgrade 11160 74, Serbia

[3] Isaac Newton Inst Chile, Yugoslavia Branch, Belgrade, Serbia

[4] Inst Nacl Astrofis Opt & Electr, Puebla 72000, Mexico

[5] Univ Belgrade, Fac Math, Dept Astron, Belgrade 11000, Serbia

[6] Univ Gottingen, Inst Astrophys, Gottingen, Germany

[7] Sternberg Astron Inst, Moscow 119992, Russia

[8] Aalto Univ, Metsahovi Radio Observ, FIN-02540 Kylmala, Finland

[9] Univ Politecn Baja California, Mexicali 21010, Baja California, Mexico

[10] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico

[11] Univ Guadalajara, Dpto Fis CUCEI, Inst Astron & Meteorol, Guadalajara 44130, Jalisco, Mexico

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2012年 / 202卷 / 01期

关键词：

galaxies: active; galaxies: individual (Ark 564); galaxies: Seyfert; line: profiles; quasars: emission lines; ACTIVE GALACTIC NUCLEI; HUBBLE-SPACE-TELESCOPE; LONG-TERM VARIABILITY; QUASI-STELLAR OBJECTS; BROAD EMISSION-LINES; LIGHT CURVES; 3C; 390.3; REGION; SIZE; ARAKELIAN-564;

D O I：

10.1088/0067-0049/202/1/10

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 II 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 H alpha, H beta, optical Fe II 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 H beta and Fe II lines with a sum of Gaussian components. We find that during the monitoring period the spectral variation (F-max/F-min) of Ark 564 is between 1.5 for H alpha and 1.8 for the Fe ii lines. The correlation between the Fe ii and H beta flux variations is of higher significance than that of H alpha and H beta (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 ii emission and find different degrees of correlation between the Fe ii emission 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.

引用

页数：22

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