Document Type
Article
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Disciplines
Astrophysics and Astronomy | Physical Sciences and Mathematics
Abstract
We present results from observations taken with the Whipple 10 m very high energy γ-ray telescope with maximal sensitivity at 400 GeV during 39 hr between 2000 and 2003 in the direction of the giant radio galaxy M87. Using the entire data set, we derive a 99% confidence level upper limit on the flux of γ-ray emission above 400 GeV from M87 to be ≤6.9 × 10-12 cm-2 s-1. This suggests variability at the 90% confidence level when compared to the flux measured by the HEGRA collaboration in 1999 if the differential spectrum is steeper than a power law of index 3.75. Our search for a correlation between the Rossi X-Ray Timing Explorer all-sky monitor observation and a potential γ-ray signal is inconclusive.
Recommended Citation
Le Bohec, S. et al., 2004. Observation of M87 at 400 GeV with the Whipple 10 Meter Telescope. The Astrophysical Journal, 610(1), pp.156–160. Available at: http://dx.doi.org/10.1086/421697.
Publication Details
The Astrophysical Journal .
© 2004. The American Astronomical Society