The spectral variability of FSRQs
Minfeng Gu (SHAO), Y. L. Ai (NAOC/Yunnan Observatory)
TL;DR
This study analyzes the optical variability of 29 FSRQs, revealing diverse amplitude ranges and spectral trends, with most showing a bluer-when-brighter pattern and one exhibiting a rare redder-when-brighter trend, possibly due to thermal emission.
Contribution
It provides the first detailed analysis of spectral variability patterns in a sample of 29 FSRQs using SDSS Stripe 82 data.
Findings
All FSRQs show variability with amplitudes from 0.24 to 3.46 mag.
About half exhibit a bluer-when-brighter trend.
Only one source shows a redder-when-brighter trend, likely due to thermal emission.
Abstract
The optical variability of 29 flat spectrum radio quasars in SDSS Stripe 82 region are investigated by using DR7 released multi-epoch data. All FSRQs show variations with overall amplitude ranging from 0.24 mag to 3.46 mag in different sources. About half of FSRQs show a bluer-when-brighter trend, which is commonly observed for blazars. However, only one source shows a redder-when-brighter trend, which implies it is rare in FSRQs. In this source, the thermal emission may likely be responsible for the spectral behavior.
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