Multi-Band Intra-Night Optical Variability of BL Lacertae
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 hou...
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doaj-8ab9773d2d184bc7ab75492206de80752020-11-25T00:49:50ZengMDPI AGGalaxies2075-44342017-12-01549410.3390/galaxies5040094galaxies5040094Multi-Band Intra-Night Optical Variability of BL LacertaeHaritma Gaur0Alok C. Gupta1Rumen Bachev2Anton Strigachev3Evgeni Semkov4Paul J. Wiita5Minfeng Gu6Sunay Ibryamov7Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, ChinaAryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263002, IndiaInstitute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Blvd., 1784 Sofia, BulgariaInstitute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Blvd., 1784 Sofia, BulgariaInstitute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Blvd., 1784 Sofia, BulgariaDepartment of Physics, The College of New Jersey, P.O. Box 7718, Ewing, NJ 08628-0718, USAKey Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, ChinaDepartment of Theoretical and Applied Physics, Faculty of Natural Sciences, University of Shumen, 115, Universitetska Str., 9712 Shumen, BulgariaWe 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.https://www.mdpi.com/2075-4434/5/4/94active galaxiesBL Lacertae object: BL Lacjets |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Haritma Gaur Alok C. Gupta Rumen Bachev Anton Strigachev Evgeni Semkov Paul J. Wiita Minfeng Gu Sunay Ibryamov |
spellingShingle |
Haritma Gaur Alok C. Gupta Rumen Bachev Anton Strigachev Evgeni Semkov Paul J. Wiita Minfeng Gu Sunay Ibryamov Multi-Band Intra-Night Optical Variability of BL Lacertae Galaxies active galaxies BL Lacertae object: BL Lac jets |
author_facet |
Haritma Gaur Alok C. Gupta Rumen Bachev Anton Strigachev Evgeni Semkov Paul J. Wiita Minfeng Gu Sunay Ibryamov |
author_sort |
Haritma Gaur |
title |
Multi-Band Intra-Night Optical Variability of BL Lacertae |
title_short |
Multi-Band Intra-Night Optical Variability of BL Lacertae |
title_full |
Multi-Band Intra-Night Optical Variability of BL Lacertae |
title_fullStr |
Multi-Band Intra-Night Optical Variability of BL Lacertae |
title_full_unstemmed |
Multi-Band Intra-Night Optical Variability of BL Lacertae |
title_sort |
multi-band intra-night optical variability of bl lacertae |
publisher |
MDPI AG |
series |
Galaxies |
issn |
2075-4434 |
publishDate |
2017-12-01 |
description |
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. |
topic |
active galaxies BL Lacertae object: BL Lac jets |
url |
https://www.mdpi.com/2075-4434/5/4/94 |
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AT haritmagaur multibandintranightopticalvariabilityofbllacertae AT alokcgupta multibandintranightopticalvariabilityofbllacertae AT rumenbachev multibandintranightopticalvariabilityofbllacertae AT antonstrigachev multibandintranightopticalvariabilityofbllacertae AT evgenisemkov multibandintranightopticalvariabilityofbllacertae AT pauljwiita multibandintranightopticalvariabilityofbllacertae AT minfenggu multibandintranightopticalvariabilityofbllacertae AT sunayibryamov multibandintranightopticalvariabilityofbllacertae |
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