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Galaxies 2016, 4(3), 25; doi:10.3390/galaxies4030025

Intra-Day Simultaneous Optical Monitoring of S5 0716+714

1
Department of Astronomy, Beijing Normal University, Beijing 100875, China
2
Department of Astronomy, Physics School, Peking University, Beijing 100871, China
3
Kavli Institute for Astronomy and Astrophysics (KIAA), Peking University, Beijing 100871, China
*
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Received: 14 July 2016 / Revised: 31 August 2016 / Accepted: 31 August 2016 / Published: 6 September 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
View Full-Text   |   Download PDF [1349 KB, uploaded 6 September 2016]   |  

Abstract

We present the results of simultaneous optical multi-color observations of BL Lac object 0716+714 in November 2014 and February 2016. The intra-day variability (IDV) varies from 0.04 to 0.3 mags. Both achromatic and bluer-when-brighter (BWB) color behaviors were detected. A probable quasi-periodic oscillation overlapping on a significant flare was also observed. We used the interpolated cross-correlation function to calculate time lags between light curves in different bands. Variations in the B and R lagging behind that in the I band were found, which corresponds with anti-clockwise loops on the color-magnitude diagrams. View Full-Text
Keywords: galaxies: active; BL Lac Objects: individual: S5 0716+714; galaxies: photometry galaxies: active; BL Lac Objects: individual: S5 0716+714; galaxies: photometry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, X.; Wu, J.; Man, Z. Intra-Day Simultaneous Optical Monitoring of S5 0716+714. Galaxies 2016, 4, 25.

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