Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3418w&link_type=abstract
American Astronomical Society, HEAD meeting #12, #34.18
Other
Scientific paper
In the first two years of science operations of the Fermi Gamma-ray Burst Monitor (GBM) since August 2008, a 7% (70 mcrab) decline was observed in the overall Crab Nebula flux in the 15 - 50 keV band, measured with the Earth occultation technique. This decline is independently confirmed in the 15-50 keV band with four other instruments: Swift/BAT, the RXTE/PCA, INTEGRAL/IBIS, and INTEGRAL/SPI. A similar decline is also observed in the 3-15 keV data from the RXTE/PCA and in the 50-100 keV band with GBM, Swift/BAT, INTEGRAL/IBIS, and INTEGRAL/SPI. The pulsed flux measured with RXTE/PCA since 1999 is consistent with the pulsar spin-down, indicating that the observed changes are nebular. Correlated variations in the Crab Nebula flux on a 3 year timescale are also seen independently with the PCA, BAT, IBIS, and SPI from 2005 to 2008, with a flux minimum in April 2007. As of April 2011, the Crab nebula flux has stopped declining and may be beginning to increase. We will present updated results on our multi-instrument study of long-term Crab nebula variations.
Baumgartner Wayne H.
Beklen Elif
Bhat Narayan P.
Briggs Michael Stephen
Camero-Arranz Ascencion
No associations
LandOfFree
When a Standard Candle Flickers: Crab Nebula Variations in Hard X-rays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with When a Standard Candle Flickers: Crab Nebula Variations in Hard X-rays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and When a Standard Candle Flickers: Crab Nebula Variations in Hard X-rays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1403411