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Title:
Spectroscopy and Three-Dimensional Imaging of the Crab Nebula
Authors:
Čadež, Andrej; Carramiñana, Alberto; Vidrih, Simon
Affiliation:
AA(Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, Ljubljana SI-1000, Slovenia; ), AB(Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Tonantzintla, Puebla 72840, Mexico; ), AC(Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, Ljubljana SI-1000, Slovenia; )
Publication:
The Astrophysical Journal, Volume 609, Issue 2, pp. 797-809. (ApJ Homepage)
Publication Date:
07/2004
Origin:
UCP
ApJ Keywords:
ISM: Individual: Name: Crab Nebula, ISM: Kinematics and Dynamics, ISM: Supernova Remnants, Techniques: Spectroscopic
DOI:
10.1086/421234
Bibliographic Code:
2004ApJ...609..797C

Abstract

Spectroscopy of the Crab Nebula along different slit directions reveals the three-dimensional structure of the optical nebula. On the basis of the linear radial expansion result first discovered by V. Trimble in 1968, we make a three-dimensional model of the optical emission. Results from a limited number of slit directions suggest that optical lines originate from a complicated array of wisps that are located in a rather thin shell pierced by a jet. The jet is certainly not prominent in optical emission lines, but the direction of the piercing is consistent with the direction of the X-ray and radio jet. The shell's effective radius is ~79", its thickness is about a third of the radius, and it is moving out with an average velocity of 1160 km s- 1.
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