SIMBAD references

2006ApJ...636..873S - Astrophys. J., 636, 873-880 (2006/January-2)

Chandra observations of the X-ray halo around the Crab nebula.

SEWARD F.D., GORENSTEIN P. and SMITH R.K.

Abstract (from CDS):

Two Chandra observations have been used to search for thermal X-ray emission from within and around the Crab Nebula. Dead time was minimized by excluding the brightest part of the nebula from the field of view. A dust-scattered halo comprising 5% of the strength of the Crab is clearly detected, with surface brightness measured out to a radial distance of 18'. Coverage is 100% at 4', 50% at 12', and 25% at 18'. The observed halo is compared with predictions based on three different interstellar grain models, and one can be adjusted to fit the observation. This dust halo and mirror scattering form a high background region that has been searched for emission from shock-heated material in an outer shell. We find no evidence for such emission. We can set upper limits a factor of 10-1000 less than the surface brightness observed from outer shells around similar remnants. The upper limit for X-ray luminosity of an outer shell is ~1034 ergs/s. Although it is possible to reconcile our observation with an 8-13 Mprogenitor, we argue that this is unlikely.

Abstract Copyright:

Journal keyword(s): ISM: Individual: Name: Crab Nebula - ISM: Supernova Remnants - X-Rays: ISM

CDS comments: End of parag. 6 : G054.1-0.3 is a misprint for G054.1+0.3 (= SNR 54.1+0.3)

Simbad objects: 12

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2021.03.07-04:45:41

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