Würzburg 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 79: Gammaastronomie III
T 79.4: Vortrag
Donnerstag, 22. März 2018, 17:20–17:35, Philo-HS7
Studying TeV Blazars with HAWC and FACT — •Michael Blank1, Daniela Dorner1 for the FACT collaboration, Jose Andres Garcia2, Magdalena Gonzalez2, and Robert Lauer3 for the HAWC collaboration — 1Universität Würzburg, Germany — 2UNAM, Mexico — 3UNM, USA
Blazars are highly variable objects on time scales from minutes to years. To study typical variability time scales from few hours to one day, continuous monitoring is crucial. To cover up to 12 hours of observations, data from the TeV monitoring instruments HAWC and FACT are combined. While the imaging air Cherenkov telescope FACT features a better sensitivity, HAWC provides a more continuous time coverage, as it is independent of weather and sun using the water Cherenkov technique.
Being the two brightest blazars in TeV energies, Mrk 421 and Mrk 501 are ideal targets for a combined variability study. Taking into account three years of data, we investigate the flux and spectral variability. The light curves of the two instruments have been compared and agree very well. Outliers found in the nightly flux correlation of the two instruments can be attributed to intra-night variability. Apparent flux changes within 12 hours can also be explained by changes of the spectral shape given the different energy ranges. Therefore, we study the spectral behaviour especially for flaring episodes. To determine time periods with constant flux, bayesian blocks are used. For a time range with constant flux, we determine the spectra for both instruments.
The presentation will show the results of the analysis of the combined data sample from HAWC and FACT.