Optical variability of the NLS1 galaxy Ark 564 in 1987-2004

被引：5

作者：

Doroshenko, V. T.

Sergeev, S. G.

Gaskell, C. M.

Golubinskii, Yu. V.

Klimek, E. S.

Sergeeva, E. A.

机构：

[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia

[2] Crimean Astrophys Observ, UA-98409 Nauchnyi, Crimea, Ukraine

[3] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

来源：

ASTRONOMY REPORTS | 2006年 / 50卷 / 09期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1134/S1063772906090046

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the results of our U BV RcIc photoelectric and CCD photometry of the NLS1 galaxy Ark 564 in 1987-2004. Between late 1997 and 2002, a slight increase in brightness was observed followed by a small but systematic decline until 2004. Ark 564 has a low variability amplitude, within 0.2(m) in the U BV RcIc bands. The galaxy's spectral energy distribution at 3600-9000 angstrom is unlike those for Seyfert 1 (Syl) galaxies. A delay of the Ic flux relative to the B flux of about three days was found, which is in agreement with the standard disk model. This delay probably reflects the geometric size of the region that emits the observed continuum.

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页码：708 / 713

页数：6

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