Color Variations of the Blazar 3C 454.3 in 2004-2006

被引：13

作者：

Hagen-Thorn, V. A. ^{[1
]}

Efimova, N. V. ^{[1
,3
]}

Larionov, V. M. ^{[1
]}

Raiteri, C. M. ^{[2
]}

Villata, M. ^{[2
]}

Arkharov, A. A. ^{[3
]}

Hagen-Thorn, E. I. ^{[1
,3
]}

Gomez, C. A. ^{[1
]}

Jorstad, S. G. ^{[1
]}

Larionova, L. V. ^{[1
]}

Takalo, L. O. ^{[4
]}

Sillanpaa, A. ^{[4
]}

机构：

[1] St Petersburg State Univ, Sobolev Astron Inst, St Petersburg 198504, Russia

[2] Natl Inst Astrophys, Turin Astron Observ, I-10025 Pino Torinese, Italy

[3] Russian Acad Sci, Main Astron Observ, St Petersburg 196140, Russia

[4] Univ Turku, Tuorla Observ, FI-21500 Piikkio, Finland

来源：

ASTRONOMY REPORTS | 2009年 / 53卷 / 06期

关键词：

VARIABLE COMPONENT; OPTICAL REGIONS; OUTBURST; OBJECT; WEBT; IR;

D O I：

10.1134/S1063772909060031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analysis of multicolor (U BV RI J H K) observations of the blazar 3C 454.3 made in 2004-2006. We used the light curves compiled at the Turin Observatory from coordinated observations in the framework of the WEBT program. We consider color variations in two time intervals, when an unprecedented strong outburst occurred (2004-2005), and when the object was in a post-eruptive state and a low-amplitude brightness increase was observed (2006). The spectral energy distribution (SED) of the variable component remained the same within each of these intervals, but differed between them. In both cases, this SED followed a power law after correction for extinction, suggesting the variable component has a synchrotron nature. We conclude that the variations in the optical and IR were due to the same variable source. The object's unusual color behavior (the brighter, the redder) was due to an increasing contribution from a variable component that was redder than the constant component (big blue bump).

引用

页码：510 / 518

页数：9

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