H-alpha monitoring of OJ 287 in 2005-08

被引：36
作者：
Nilsson, K. [1 ,2 ]
Takalo, L. O. [1 ]
Lehto, H. J. [1 ]
Sillanpaa, A. [1 ]
机构：
[1] Univ Turku, Dept Phys & Astron, Tuorla Observ, Piikkio 21500, Finland
[2] Univ Turku, Finnish Ctr Astron ESO, Piikkio 21500, Finland
来源：
ASTRONOMY & ASTROPHYSICS | 2010年 / 516卷
关键词：
galaxies: active; BL Lacertae object: individual: OJ 287; galaxies: nuclei; BL-LACERTAE OBJECTS; DIGITAL SKY SURVEY; BLACK-HOLE MODEL; 5TH DATA RELEASE; OPTICAL SPECTROSCOPY; OUTBURSTS; OJ-287;
D O I：
10.1051/0004-6361/201014198
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the results of H alpha monitoring of the BL Lac object OJ 287 with the VLT during seven epochs in 2005-08. We were able to detect five previously undetected narrow emission lines,lambda lambda 6548, 6583[NII], lambda 6563H alpha and lambda lambda 6716, 6731 [SII] during at least one of the epochs and a broad H alpha feature during two epochs. The broad H alpha luminosity was a factor similar to 10 lower in 2005-08 than in 1984 when the line was previously detected and a factor similar to 10 lower than what is observed in quasars and Seyfert galaxies at the same redshift. The data are consistent with no change in the position or luminostity of the H alpha line in 2005-08. The width of the H alpha line was 4200 +/- 500 km s(-1), consistent with the width in 1984.
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页数：5
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