2001A&A...365L.212W


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST14:22:30

2001A&A...365L.212W - Astronomy and Astrophysics, volume 365, L212-217 (2001/1-1)

New light on the X-ray spectrum of the Crab Nebula.

WILLINGALE R., ASCHENBACH B., GRIFFITHS R.G., SEMBAY S., WARWICK R.S., BECKER W., ABBEY A.F. and BONNET-BIDAUD J.-M.

Abstract (from CDS):

XMM-Newton observations of the Crab provide new information on its integrated X-ray spectrum and the variation of the spectral form across the nebula. The Crab pulsar and its surrounding torus exhibit the hardest spectra with power-law indices of Γ=1.6 and 1.8. The jet and outer reaches of the nebula are significantly softer with Γ=2.1 and 2.3 respectively. For the whole nebula, the huge number of recorded counts allows a detailed examination of the soft X-ray absorption due to cool gas in the foreground of the Crab. Absorption edges due to oxygen and neon are clearly identified. Oxygen and iron in the interstellar medium are underabundant by a factor of 0.63±0.01. The average NH=3.45±0.02x1021cm–2 and varies by less than ±11% on a scale equal to or larger than 20 arcsec over the face of the nebula. These observations of the Crab provide an excellent demonstration of the power of the EPIC cameras on XMM-Newton for spatial, spectral and timing studies.

Abstract Copyright:

Journal keyword(s): ISM: supernova remnants - ISM: individual: Crab Nebula

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           F 4711 1
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5486 4
3 QSO B0737+744 BLL 07 44 05.3737292010 +74 33 58.260126612     16.89 16.6   ~ 113 0
4 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2330 1
5 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5242 1

    Equat.    Gal    SGal    Ecl

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2019.10.22-14:22:30

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