No Evidence for [O III] Variability in Mrk 142
A. J. Barth, M. C. Bentz
TL;DR
This study reanalyzes archival data of Mrk 142 and finds no evidence of [O III] flux variability, contradicting previous claims and suggesting a more extended narrow-line region.
Contribution
It demonstrates that previous claims of [O III] variability were due to calibration errors, clarifying the stability of the narrow-line region in Mrk 142.
Findings
No significant [O III] flux variations detected
Previous variability claims attributed to calibration errors
Supports a stable narrow-line region in Mrk 142
Abstract
Using archival data from the 2008 Lick AGN Monitoring Project, Zhang & Feng (2016) claimed to find evidence for flux variations in the narrow [O III] emission of the Seyfert 1 galaxy Mrk 142 over a two-month time span. If correct, this would imply a surprisingly compact size for the narrow-line region. We show that the claimed [O III] variations are merely the result of random errors in the overall flux calibration of the spectra. The data do not provide any support for the hypothesis that the [O III] flux was variable during the 2008 monitoring period.
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