| Autor: |
Xie, G.Z., Zhou, S.B., Dai, B.Z., Liang, E.W., Li, K.H., Bai, J.M., Xing, S.Y., Liu, W.W. |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; 2/1/2002, Vol. 329 Issue 4, p689-699, 11p |
| Abstrakt: |
We present the results of our monitoring the flux variability of 12 BL Lac objects, which have variabilities on time-scales ranging from hours to months. Individual sources are discussed in detail. Three of them, OY091, H0548–322 and 0048–097, show significant rapid variation (hours). Two of them, 3C 66A and Mrk 501, exhibit significant variability on time-scales of months. We find that 3C 66A has a variability period of 63±5 d, supporting the 65-d period obtained by Lainela et al. The periodicity seems to be weak according to the Jurkevich V[sub m][sup 2] test. We also find a correlation between B-V colour index and B magnitude for Mrk 421. We discuss possible physical mechanisms on the basis of these observational phenomena. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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