VALC

VALC is Python package, which is devoted to post-processing of ZTF Forced Photometry light curves and conducting statistical test to reject the hypothesis of a constant with white noise. The purpose of the work in confirmation of the presence of active galactic nuclei (AGN) type-1 in the host galaxies of candidates. Tests of the algorithm was provided on a sample of AGN, powered by intermediate mass black holes (IMBH; M < 2*10^5 M☉) and low-weighted supermassive black holes (LWSMBH; M < 2*10^6 M☉). Post-processing includes outlier filtering, color correction and zero-point correction. The key advantage of the algorithm is the subtraction magnitude of the median comparison star, which is exstracted from 50 nearest non-variable stars. [1,2].

[1]Demianenko M. et al., "Optical Variability of "Light-weight" Supermassive Black Holes at a Few Percent Level from ZTF Forced-Photometry Light Curves", Proceedings of ADASS-2021 conference, 2022, https://arxiv.org/abs/2201.03712

[2]Demianenko M. et al., "Optical light curves of light-weight supermassive black holes produced by the Zwicky Transient Facility Forced Photometry Service", Proceedings of VAK-2021 conference, 2021, https://arxiv.org/abs/2112.11520

https://github.com/masha-astro/optical_variability_ztf

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