Observations of High Energy Flaring Events in M87 at Multiple Wavelengths from TeV to Radio

Details Observations of High Energy Flaring Events in M87 at Multiple Wavelengths from TeV to Radio Observations of High Energy Flaring Events in M87 at Multiple Wavelengths from TeV to Radio

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915431w&link_type=abstract

American Astronomical Society, AAS Meeting #219, #154.31

Astronomy and Astrophysics

Astronomy

Scientific paper

M87 contains a several billion solar mass black hole that generates a jet that can be observed across the electromagnetic spectrum. With its relative proximity and large black hole, M87 is arguably the best object in which to study processes in an extragalactic jet on small dynamical scales.
M87 is a source of very high energy (VHE: E>100GeV) γ-rays. That emission shows variability, including significant flares, on time scales as short as a day. Here we report on efforts to associate VHE flares with variability at other bands, where higher resolution observations are possible, to locate the VHE emission region and provide constraints on the VHE emission mechanism.
Clear episodes of VHE flaring have been observed by the atmospheric Cerenkov telescopes VERITAS, MAGIC, and H.E.S.S. in 2005, 2008, and 2010. These flares each have somewhat different characters in the VHE light curves. Also the activity at other wavelengths showed significant differences. The 2005 event occurred during a large and long lived flare at longer wavelengths in the jet knot HST-1 at 0.86" from the nucleus. HST-1 was quiet during the 2008 and 2010 flares. There was a strong flare at 43 GHz on the radio core seen with the VLBA at the time of the 2008 flare, but not the 2010 flare. The best correlation so far is with X-ray emission from the nucleus. The lack of consistency in light curves and lower frequency activity between the events has prevented reaching clear conclusions so far. However the multi-wavelength analysis places significant observational constraints on the viable emission models.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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