Imaging the Crab Nebula with RHESSI: a Progress Report

Details Imaging the Crab Nebula with RHESSI: a Progress Report Imaging the Crab Nebula with RHESSI: a Progress Report

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0113h&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.13; Bulletin of the American Astronomical Society, Vol. 38, p.331

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High-resolution x-ray images of the Crab Nebula from Chandra, Newton and ROSAT at energies up to 10 keV show a very different picture from the optical appearance which gave the nebula its name -- instead of a chaotic tangle of strands, there is an obvious axis of symmetry, with an inner ring, outer torus, and jets. At higher energies, the only available data were balloon-based observations with 15" resolution by Pelling et al. (ApJ 319, 416, 1997).
In June of 2004 and 2006, week-long observations of the Crab were made with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) over an energy range from 3 to 100 keV, limited at the low end by the detector threshold and window absorption and on the high end by photon statistics. RHESSI's rotating modulation collimator imaging system can image solar flares (its usual targets) down to 2.3" FWHM resolution with high spectral resolution using germanium detectors. For the Crab, the angular resolution is currently limited by our ability to reconstruct spacecraft aspect for non-solar targets using auxiliary systems (the primary aspect system relies on measuring solar limb positions when Sun-pointed). We will present the current results of the Crab imaging and outline our plans, including 'point-source' calibrations using June/July 2005 observations of an outburst of x-ray pulsar 1A 0535+26.

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