Volume 516, June-July 2010
|Number of page(s)||5|
|Published online||28 June 2010|
H-alpha monitoring of OJ 287 in 2005-08*
Tuorla Observatory, Department of Physics and Astronomy,
University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland e-mail: email@example.com
2 Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
Accepted: 9 April 2010
We present the results of Hα 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, λλ6548, 6583[NII], λ6563Hα and λλ6716, 6731 [SII] during at least one of the epochs and a broad Hα feature during two epochs. The broad Hα luminosity was a factor ~10 lower in 2005-08 than in 1984 when the line was previously detected and a factor ~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 Hα line in 2005-08. The width of the Hα line was 4200 ± 500 km s-1, consistent with the width in 1984.
Key words: galaxies: active / BL Lacertae object: individual: OJ 287 / galaxies: nuclei
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.