1. BL Lac objects: Laboratories to study the environment and properties of emitting electrons
Nijil Mankuzhiyil
INFN Trieste & University of Udine, Italy
in collaboration with
Stefano Ansoldi, Massimo Persic, Fabrizio Tavecchio

2. SSC Model in BL Lac objects
Double peak structure
First peak => Synchrotron emission
Second peak => SSC
Blob radius, magnetic field, Doppler factor
Lorentz factors, slopes, electron density

3. Once upon a time.. Nowadays .. PKS 2155-304 Mrk 501 Costamante (2001)
HESS, Fermi collab. et al. (2009)
MAGIC, VERITAS, Fermi collab. et al. (2010)

4. c2 minimized SEDs

5. Application of Kolmogorov-Smirnov test
Test fails at 5% confidence level
Two distinct physical processes, in very far away energy ranges;
2. Different uncertainty pattern on low and high energy data.
we applied Kolmogorov-Smirnov test separately at low and high energy data points;
in this way the test does never reject normality of the residuals at the 5% confidence level;
=> suggest improvements to the model and/or the data sets

6. Mrk 421 Mankuzhiyil et al. ApJ, 733, 14 (2011)

7. Mrkn 421 - Fitting parameters

8. Mrk 501 (Mankuzhiyil et al. to be submitted)
Giant April 1997 Flare

9. Mrk 501: electron spectrum
Freshly accelerated electrons
Aging electrons

10. Conclusion Statistically meaningful SSC fit
Mkn 421 => interesting correlation/anti-correlation of parameters
Mkn 501 => fresh electron injection

11. B – d anticorrelation
B – d correlation (KN)
Larmor radius

12. Mrk 501 B-d