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Spectral Variability Analysis of BL Lacertae

Kohli, Meenakshi
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1343698887

Abstract Details

2012, Master of Science (MS), Ohio University, Physics and Astronomy (Arts and Sciences).
BL-Lacertae is the prototype of BL Lac objects. It has been observed during the months of May, October and December 2011 with the aim of studying the intranight color variations on short timescales using the method of Color-Magnitude Diagram analysis and to look for the time-lag between the variations at different optical wavelengths using the method of Discrete Correlation Function analysis. Quasi-simultaneous measurements in the UBVRI bands have been performed using the 1.3 m optical telescope at MDM observatory at Kitt-Peak, AZ. A flare is observed during May 2011 in optical data that is also seen in the same time period in the gamma ray data, which is taken directly from the Fermi LAT website. BL Lacertae showed the trend Redder when Brighter and the transition to Bluer when brighter in the higher flux states, i.e. when the magnitude of R band is less than 13.5. A time-lag between the variations at optical wavelength band B and R is found to be (0.01 +/- 0.0056) day (less than 2ς). Using the value of time-lag, the lower limit on the magnetic field in the jet is found to be B > 1.24 G.
Charlotte Elster (Committee Chair)
david Drabold (Committee Member)
Markus Boettcher (Advisor)
Joseph Shields (Committee Member)
52 p.
Physics
Spectral variability analysis of BL Lac; Spectral Energy Distribution; BL Lacertae

Recommended Citations

Citations

  • Kohli, M. (2012). Spectral Variability Analysis of BL Lacertae [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1343698887

    APA Style (7th edition)

  • Kohli, Meenakshi. Spectral Variability Analysis of BL Lacertae. 2012. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1343698887.

    MLA Style (8th edition)

  • Kohli, Meenakshi. "Spectral Variability Analysis of BL Lacertae." Master's thesis, Ohio University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1343698887

    Chicago Manual of Style (17th edition)

ohiou1343698887
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© 2012, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.