8-10 June 2016
Asia/Bangkok timezone

Photometric Monitoring of Active Galactic Nuclei for Short-term Variability

Jun 9, 2016, 10:00 AM
Room J1

Room J1

Oral presentaion Astronomy, Astrophysics and Cosmology Session XIII


Ms Supharat Charoensiri (Chulalongkorn University)


Active Galactic Nuclei (AGNs) typically show variability on all time
scales which can range from days to years. The purpose of this work is
to study intra-year variability (i.e., months-timescale) of AGNs
through photometric monitoring in order to determine candidates for a
follow-up study for reverberation mapping techniques. Our sample of
AGNs are drawn from a well-defined quasar sample from the Hamburg/ESO
Survey or HES, which consists of 330 quasars with redshifts z < 0.3.
We have used the robotic Thai Southern Hemisphere Telescope at Cerro
Tololo Inter-American Observatory in Chile to observe the targets in
optical broadband B, V and R filters. After standard image
calibration, we use a custom-written pipeline based on publicly
available software to produce light curves from our observation for
future analysis. We analyze the light curves to determine whether the
target quasar shows intra-year variability and compare our photometry
with the original HES data which was taken about 25 years ago to
further study decade-scale variability. Here, we present our current
results of our light-curve analysis and show some particularly notable
example, such as HE1309-2501 with significant variability over short

Primary author

Ms Supharat Charoensiri (Chulalongkorn University)


Dr Malte Schramm (National Institute of Advanced Industrial Science and Technology) Dr Wiphu Rujopakarn (Chulalongkorn University)

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