천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제38권2호
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- Pages.54-54
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- 2013
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- 1226-2692(pISSN)
Monitoring observation of PG0934+013 using The Southern African Large Telescope
- Park, Dawoo (Dept. of physics and astronomy, Seoul National University) ;
- Woo, Jong-Hak (Dept. of physics and astronomy, Seoul National University) ;
- Romero-Colmenero, Encarni (South African Astronomical Observatory) ;
- Crawford, Steven M. (South African Astronomical Observatory) ;
- Barth, Aaron J. (Dept. of physics and astronomy, University of California) ;
- Pei, Liuyi (Dept. of physics and astronomy, University of California)
- 발행 : 2013.10.08
초록
We performed spectroscopic and photometric monitoring observations of a QSO, PG0934+013 for a reverberation-mapping analysis, using the 9-m Southern African Large Telescope (SALT) for spectroscopy and the 2-m Faulkes Telescope North and the South for photometry. The monitoring campaign was carried out for 5 month between December 2012 to April 2013, providing 20 spectroscopic epochs and ~40 photometric epochs. Based on the obtained spectra, which typically have a signal-to-noise ratio to 30-60, we performed multicomponent decomposition using various components, i.e., power-law continuum, FeII emission complex, and broad and narrow emission lines, to properly measure the Hbeta line flux. After a flux normalization using [O III] 5007 line luminosity, we obtained a rms spectrum from all epochs, which shows clear variability of Hbeta line. We find that Hbeta line flux decreases by ~20% during the monitoring period while the continuum flux obtained from the aperture photometry based on the imaging data, shows similar variability. The current Hbeta light curve shows monotonic decrease and a reliable cross correlation analysis between Hbeta and continuum light is difficult. Nevertheless, we obtained a preliminary lag measurements as ~24 light days.
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