Period analysis of secular optical light variations of the quasar PKS 2251+158

Authors
Su, CY
Citation
Cy. Su, Period analysis of secular optical light variations of the quasar PKS 2251+158, CHIN ASTR A, 25(2), 2001, pp. 153-158
Citations number
37
Categorie Soggetti
Space Sciences
Journal title
CHINESE ASTRONOMY AND ASTROPHYSICS
ISSN journal
02751062 → ACNP
Volume
25
Issue
2
Year of publication
2001
Pages
153 - 158
Database
ISI
SICI code
0275-1062(200104/06)25:2<153:PAOSOL>2.0.ZU;2-C
Abstract
We have collected optical observational data of the blazar PKS 2251+158 for nearly 100 years and analyzed its long-tem periodicity in the light variat ion. The maximum amplitude of light variation in B was found to be 2.86 mag . Using the Jurkevich method, a period of 12.39 yr was found, It is probabl e that at the center of this object there is a black hole of mass 8.0 x 10( 5) and that the gamma amplification factor is not less than 7.2, The Jurkev ich method was also discussed.