טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentEdry Haim
SubjectBroad Band Photometric Reverbration Mapping
DepartmentDepartment of Physics
Supervisor Professor Ehud Behar
Full Thesis textFull thesis text - English Version


Abstract


We present results of broad band photometric reverberation mapping (RM) to measure the radius of the broad line region, and subsequently the black hole mass (MBH), in the nearby, low luminosity active galactic nuclei (AGN) NGC 4395. Using the Wise Observatory's 1m telescope equipped with the SDSS g', r' and i' broad band filters, we monitored NGC 4395 for 9 consecutive nights and obtained 3 light curves each with over 250 data points.  The g' and r' bands include time variable contributions from Hβ and Hα (respectively) plus continuum.  The i' band is free of broad lines and covers exclusively continuum.  We show that by looking for a peak in the difference between the cross-correlation and the auto-correlation functions for all combinations of filters, we can obtain a reliable estimate of the time lag necessary to compute MBH.  We measure the time lag for Hα to be 3.6 ? 0.8  hours, comparable to previous studies using the line resolved spectroscopic RM method.  We argue that this lag implies a black hole mass of  MBH = (4.9 ? 2.6) ? 104 solar mass, which is several times smaller than previously estimated. The most important results of this thesis were published in The Astrophysical Journal (Edri et al. 2012).