Intra-day optical multi-band quasi-simultaneous observation of BL Lacertae object S5 0716+714 from 2013 to 2016
Abstract
We performed quasi-simultaneous optical multi-band monitoring of the BL Lac object S5 0716+714 on seven nights from 2013 to 2016. Intra-day variability was found on all seven nights. The source was faintest on JD 245 6322 with 14.15 mag and brightest on JD 245 7437 with 12.51 mag in the R band. The maximum intra-day variation that we observed was 0.15 mag in the B band on JD 245 6322. Both bluer-when-brighter and achromatic spectral behaviours were observed on the intra-day timescale. On the longer-term scale, the object exhibited mild bluer-when-brighter behaviour between the B and R bands. We estimate the inter-band lags using two independent methods. The variation in the B band was observed to lag behind that in the I band by about 15 min on JD 245 7315. We compare this lag with one reported previously and discuss the origin of these lags.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2018
- DOI:
- 10.1093/mnras/sty1468
- arXiv:
- arXiv:1806.08148
- Bibcode:
- 2018MNRAS.478.3513Z
- Keywords:
-
- galaxies: active;
- BL Lacertae objects: individual: S5 0716+714;
- galaxies: photometry;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Published in MNRAS