Multi-Band Intra-Night Optical Variability of BL Lacertae
Autor: | Sunay Ibryamov, Anton Strigachev, R. Bachev, Haritma Gaur, Paul J. Wiita, Minfeng Gu, Evgeni Semkov, Alok C. Gupta |
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Rok vydání: | 2017 |
Předmět: |
jets
Physics High Energy Astrophysical Phenomena (astro-ph.HE) genetic structures lcsh:Astronomy 010308 nuclear & particles physics FOS: Physical sciences active galaxies Astronomy and Astrophysics Astrophysics BL Lacertae object: BL Lac Light curve 01 natural sciences lcsh:QB1-991 Multi band Amplitude 0103 physical sciences Chromatic scale Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Sampling interval Visible spectrum |
Zdroj: | Galaxies; Volume 5; Issue 4; Pages: 94 Galaxies, Vol 5, Iss 4, p 94 (2017) |
DOI: | 10.48550/arxiv.1712.02515 |
Popis: | We monitored BL Lacertae frequently during 2014 - 2016 when it was generally in a high state. We searched for intra-day variability for 43 nights using quasi-simultaneous measurements in the B, V, R, and I bands (totaling 143 light curves); the typical sampling interval was about eight minutes. On hour-like timescales, BL Lac exhibited significant variations during 13 nights in various optical bands. Significant spectral variations are seen during most of these nights such that the optical spectrum becomes bluer when brighter. The amplitude of variability is usually greater for longer observations but is lower when BL Lac is brighter. No evidence for periodicities or characteristic variability time-scales in the light curves was found. The color variations are mildly chromatic on long timescales. Comment: 15 pages, 5 Figures, 3 Tables; Accepted for publication in Galaxies; a special issue on Microvariability of Blazars |
Databáze: | OpenAIRE |
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