X-Ray Variability in M87: 1992-1998

Details X-Ray Variability in M87: 1992-1998 X-Ray Variability in M87: 1992-1998

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...0058175h&link_type=abstract

Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States

Astronomy and Astrophysics

Astrophysics

X Rays, Variability, Rosat Mission, High Resolution, Photometry

Scientific paper

Beginning in 1995 June, we have obtained an observation of M 87 with the ROSAT High Resolution Imager (HRI) every 6 months. We present the measurements of X-ray intensity for the core and knot A through 1998 January. We find significant changes in both components. For the core, intensities measured in June 1995, December 1996, and December 1997 are roughly 30% higher than values obtained at three intervening times. For knot A, a secular decrease of approximately 15% is interrupted only by an intensity jump (3 sigma) in December 1997. Because the background used for subtraction is probably underestimated, we suspect the actual variation is somewhat greater than these values indicate.

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